STIHL AZA 752 (01) PDF MANUAL

The contact breaker switch is used for maintenance. Keep the switch in the “ON” position during normal operation. Before attempting any maintenance, move the contact breaker switch to the “OFF” position. Once maintenance is complete, return switch to the “ON” position.

• Keep bystanders away.

• Do not operate without discharge chute securely in place.

Before cleaning or inspecting the lawnmower, turn off the motor, wait until the blade(s) comes to a complete stop, operate the disabling device and/or remove all batteries, if removable. Accidental contact with the moving blade and moving parts may result in personal injury.

• Clear the operating area of any objects that could be thrown by or interfere with the operation of the mower.

• Do not operate mower without the entire discharge chute or other safety devices in place and functioning properly. Check frequently for signs of wear or deterioration and replace as needed.

• Reduce speed and use extra care when mowing on slopes.

• Avoid turning the mower down slopes. Turn up slopes.

• Always keep the machine in gear when going down slopes. Do not coast downhill.

• Avoid starting and stopping on slopes.

• Avoid making sudden changes in speed or direction. Make turns slowly and gradually.

To reduce the risk of serious personal injury or death, never operate on slopes greater than 15 degrees. Always check the degree of slope on the lawn surface before attempting to mow in that area.

• Download an inclinometer app onto your mobile device that measures slopes.

• Place a flat piece of wood or metal, 4-6 feet in length, on the surface of the slope.

• Open the app and place your phone on the flat piece of metal or wood to determine the exact slope of your lawn. Do not mow if the slope is greater than 15 degrees.

Check mower safety start interlock system daily prior to operation. This system is an important mower safety feature. It should be repaired immediately if it malfunctions.

To inspect the system:

1. Press the activation button with the key inserted.

2. With both motion control handles pivoted outwards to engage the parking brake. Pull the PTO switch to engage the blade motor, and the mower blades should not engage.

3. Move either of the motion control handles inwards. Pull the PTO switch to engage the blade motor, and the mower blades should engage.

4. If the safety system does not operate as described, contact your authorized STIHL servicing dealer immediately.

1. Remove all the R pins and clevis pins securing every frame and remove the frame.

2. Release or cut the four straps securing the front and rear part to the bottom frame.

3. Remove boxes containing the documentation.

4. Remove and set aside all accessible packaging and wrap from unit and parts. Do not discard the packing material until you have carefully inspected and satisfactorily operated the product.

5. Inspect the product carefully to make sure no breakage or damage occurred during shipping. After the inspection, raise the cutting deck to its highest position, and slowly and carefully drive mower off the frame.

These anti-scalp wheels are designed to minimize scalping when mowing on rough, uneven terrain. After setting the cutting height, adjust the anti-scalp wheels so they extend below the deck but do not contact the ground. They should always be at least 1/4 in to 3/4 in (0.6 cm to 1.9 cm) below the deck. With the mower sitting on a flat level surface, the wheel position can be adjusted up or down as needed from 3/4 in to 2-1/4 in (1.9 cm to 5.7 cm) from the anti-scalp wheels to the ground.

• After adjusting the cutting height, adjust the anti-scalp wheels by removing the locking flange nut and the hex bolt which fix the wheels.

• Select a hole so that the wheel is positioned to the corresponding height-of-cut desired.

• For cutting height over 3.5 inches (90mm) use the bottom hole. The anti-scalp wheels will be effective against scalping.

• Install the locking flange nut and the hex bolt.

• Repeat the adjustment on the other anti-scalp wheels.

To adjust the cutting height:

• Stop the mower and disengage blades.

• Press activation button to turn the mower OFF. Set the parking brake by pivoting the motion control handles outward.

• Pull the cutting height adjustment handle back to the top position and lock in place.

• Insert the height adjustment pin into desired height adjustment hole.

• Release the lock knob and allow height adjustment handle to rest back onto the pin.

The operator platform can be used in the up or down position.

To lower the platform from the raised position, pull the knob while holding on to the platform and slowly lower the platform until it is in the down position.

To raise the platform, push the platform up until the knob locks in place.

Operating the mower with the platform up is recommended when:

• Mowing areas with obstacles and low hanging branches.

• Loading/unloading the mower from trailers, ramps, etc.

Open the top cover to access the USB-A and USB-C charging ports. The center LED indicates when charging is in process. The mower must be activated for charging.

The mower can be used with other attachments designed specifically for this unit, such as an accessory blower. The attachments can be powered by the mower with the ETO socket in the front part of the mower and mounted to the front hitch if the attachment has the matched port.

Use only attachments supplied by STIHL or expressly approved by STIHL for use with this specific mower.

• Make sure that all nuts, bolts, screws, and pins are in place and tight.

• Make sure that you can reach all of the controls from the operator’s position.

1. Insert the key into the activation system and press the activation button.

2. Pivot the motion control handles inward to the NEUTRAL position.

3. Pull up the PTO switch to start mower blades for mowing.

4. Push motion control handles forward for forward motion and pull for reverse motion.

Note:

• Always start out in low mode/slow speed.

• Engage blades only after motion control handles are moved into the NEUTRAL position. And only engage blades when mowing is needed.

• Electric parking brake will release when motion control handles are moved to the neutral position.

1. Drive the mower to a flat, level surface and return the motion control handles to the NEUTRAL position to stop the mower’s movement. Pivot the motion control handles outward to engage the parking brake.

2. Disengage the PTO by pushing down on the PTO switch.

3. Press the activation button to turn the mower off. Remove the key.

The function of the digital display, located on the control panel, is to provide electrical system information to the operator. It gives detailed information in the form of patterns, codes and numbers.

Note: After setting the blade speed and driving speed, it is recommended to lock the LED screen to prevent unintended changes to the settings. Keep the display screen clean and dry.

When the mower is activated, the following information will show on the screen. Press the “OK” button to confirm.

Press and hold the UP and DOWN buttons on the control panel simultaneously for 3 seconds to lock/unlock the screen. When the screen is locked, all the touch operations will be disabled and the home page will show a lock.

The ETO allows this mower to be used together with special STIHL accessories.

1. When accessories are mounted on the mower and plugged into the front or rear ETO socket, the ETO page will show on the screen. When ETO power is off, the touch button will be gray.

2. Touch the ETO button to power on the ETO. The button will turn orange.

3. Press the Switch Page button or the Home/Back button to return to the home page. The ETO icon will show the ETO power state. Orange represents “power on” and gray represents “power off”.

The ETO icon on the Home screen only shows the ETO status. Navigate to the ETO page to turn the ETO on or off.

1. When a software update becomes available, a prompt will appear, informing the user of the update and asking whether to install the update.

2. After the operator confirms, the mower will start the remote update only when connected to the GPS signal.

3. During the update, a message will be displayed on the screen, reminding the operator not to turn off and stop the mower. The screen will also show an update progress bar and result.

4. To finish the update, turn off and then restart the mower. You can then use it as usual.

Note: If the power is turned off during the update process, a message will appear when it is turned on again, asking the operator once more to confirm the update.

1. When the mower is activated, all the lights will turn on with a sequence, first the front and rear lights, then the front fender lights, last the side lights which will flash for 2-3 seconds and then turn off.

2. Press the Switch Page button to turn the digital display to the Lights page.

3. Press the Hazard Lights button to turn the LED lights on/off. When the Hazard Lights button is orange, the hazard lights are ON, and the Hazard Lights icon will show on the home screen. When the Hazard Light button is gray, the hazard lights are OFF, and the Hazard Lights icon on the home screen will disappear.

4. Press the Lights button to turn the lights, including two front lights, two front fender lights, four tower lights, on/off. When the Lights button is orange, the Lights are ON, and the Lights icon will show on the home screen. When the Lights button is gray, the Lights are OFF, and the Lights icon on the home screen will disappear.

Press the Switch Page button to go to the Settings page. You can set 6 items including Errors, Statistics, Brightness, Language, Preferences and Low Traction Mode.

To access specific settings:

1. Touch the Errors button to enter the Errors page. This page will show all the errors. Touch the specific error name to read the suggestions. Touch “X” to exit.

2. Touch the Statistics button to enter the Statistics page. This page shows the total work hours, total mowing hours, and blade hours. Touch the “RESET BLADE HOURS” button, the blade hours will clear to zero. Touch “X” to exit.

3. Touch the Brightness button to enter the Brightness page. Select your desired screen brightness. Touch “X” to exit.

4. Touch the Language button to enter the Language page. Select the language you need. Touch “X” to exit.

5. Touch the Preferences button to enter the Preferences page. Select the units of measure. Touch “X” to exit.

6. Touch the Low Traction Mode button to enter the low traction mode page. Low traction mode can be used to increase control and reduce the risk of slipping. Touch “X” to exit.

When the mower blades are working, the “MOWING” button will show on the home screen.

Touch the “MOWING” button to enter mowing session page. The mowing session data can be accessed.

When the mower blades stop working, mowing session data will be saved for 15 minutes. If the mower blades restart working, mowing session will continue the record.

Touch the “STOP MOWING SESSION” button to turn off the mowing session function.

Touch the “START MOWING SESSION” button to turn on the function.

1. Download the STIHL AZA App from your app store.

2. Add a device by scanning the QR-code with the STIHL AZA App or typing in serial number and pairing code which can be found on the matching label.

The stand-on mower’s motion control handles are quick to respond. The optimal approach for managing these handles involves three steps:

1. Place your hands onto the handles.

2. To move forward slowly, push the handles forward with your palms.

3. To reach the maximum of the set speed, move the handles farther forward. For a gentle deceleration, move the handles towards neutral.

Move both motion control handles evenly and gradually forward from neutral. Practice slowing down and repeating.

Mastering straight forward travel requires practice. Adjust the speed as needed; refer to the speed adjustment in the LED DISPLAY section of this manual.

While moving forward, gently bring one motion control handle back towards neutral. Practice this repeatedly.

To reduce potential damage to the lawn, avoid pivoting directly on the tire tread by ensuring both wheels maintain a slight forward motion.

For a “zero-turn” maneuver, gradually move one motion control handle forward from neutral while moving the other handle back from neutral simultaneously. Practice this several times.

Adjusting the extent of pulling each motion control handle forward or back alters the turning “pivot point.”

Your stand-on mower’s exceptional feature of turning in place allows you to pivot at the row’s end instead of stopping and performing a Y-turn before commencing a new row.

Here’s how to execute a left end-of-row zero turn:

1. Gradually decelerate at the row’s end.

2. Slightly push the RIGHT motion control handle forward while moving the LEFT motion control handle back to its center and then slightly back.

3. Resume forward mowing.

By adopting this approach, the mower turns left and slightly overlaps the recently cut row, eliminating the necessity to backtrack and re-cut any missed grass.

Select a smooth, level area to mow. Be cautious of trees, fences, and slopes. Mow in straight lines, slightly overlapping. Occasionally change patterns to prevent flat spots.

For a professional touch, mow across once and then go perpendicular on the next round.

When mowing expansive spaces, begin by turning towards the right to ensure that clippings are directed away from shrubs, fences, driveways, and other areas. After completing one or two rounds, mow in a back-and-forth pattern across the lawn, pivoting at the edges of the previously mowed grass.

Broadcasting, also known as side discharge, is a mowing technique that efficiently processes a larger volume of grass in a single pass. This method involves expelling grass clippings to the side of the mower deck and dispersing them across the lawn. The side discharge deck design allows for effective cutting even in high grass conditions, making it ideal for larger areas where expedited mowing is essential. For optimal mowing, set blade speed to the highest level. If the motor slows, reduce drive speed. Slower drive speed boosts blade efficiency and prevents cutting issues. Choose broadcast mowing for 3-5 inch grass. Avoid cutting more than 1 inch at once.

Mulching offers versatile benefits, finely cutting grass and returning clippings to the soil. Remember, mulching works best on dry and moderate-height grass. For successful mulching, set the blade speed highest and match it with the slowest driving speed. This ensures finely cut clippings. When mulching, drive at about half the speed used for broadcasting.

Ideal mulching trims just the top ½ – ¾ inch of grass, resulting in decomposing clippings. Experiment with cutting height based on your climate, season, and lawn thickness. Always mow thoughtfully and consider your lawn’s unique conditions for the best results.

Cutting height often depends on preference. Typically, mow when grass is 3-5 inches high. Proper height varies based on grass type, rainfall, temperature, and lawn health. Cutting too short weakens grass and makes it prone to damage by dry periods and pests. Slightly longer grass is less prone to damage. Longer growth in hot, dry conditions reduces heat stress, conserves moisture, and guards against damage. Keeping the grass too long leads to thin turf and problems. Don’t cut too much at once; follow the 1/3 rule: trim a maximum of 1/3 and no more than 1 inch at a time.

The timing and grass condition significantly influence mowing outcomes. Follow these guidelines for best results:

• Mow when grass height is between 3 to 5 inches.

• Use sharp blades for precision. Short clippings under one inch decompose faster, and sharp blades prevent frayed edges.

• Choose a cool and dry time of day for mowing, like late afternoon or early evening.

• Avoid mowing after rain or heavy dew. Never mulch wet grass as it clumps beneath the mower deck and doesn’t mulch effectively.

Do not tow this mower, it may cause damage to the drive system.

Do not load mower on a trailer or truck using two separate ramps. Only use a single width ramp that is at least one foot wider than the width of the rear wheels of the mower. The rear wheels could fall off the ramps or the unit could tip over injuring the operator or bystanders. Ensure the cutting deck is raised to the highest position so it does not get caught on the ramp.

• Park the mower on a level surface.

• Raise the cutting deck to the highest position.

• Position and secure ramp to the trailer according to manufacturer’s instructions.

• Use a full width loading ramp that is at least 1 ft. wider than the mower to reduce the risk of driving off the side of the ramp.

• Back the machine up the ramp and walk it forward down the ramp.

• Avoid sudden acceleration or deceleration while driving on a ramp as it may result in loss of control or a potential tip-over.

• After loading, lower mower deck completely.

• Pivot the motion control handles outward to engage the parking brake.

• Turn off mower and remove key.

• Secure the mower as needed using straps or cables to prevent movement during transport. The tie down points are shown in the figure below (two points at each side).

To push the mower manually:

1. Disengage the blades and push the motion control handles outward to engage the parking brake.

2. Press the activation button to turn the mower OFF. Remove the key, and wait for all moving parts to stop before leaving the operating position.

3. Unlock the transmission release levers to release the parking brakes.

4. Move the mower to the desired location.

To avoid damage to the motor and drive mechanism, do not move the machine faster than 5 mph (8 km/h) or it may cause damage to the mower.

Immediately after moving the mower, lock the transmission release levers.

The transmission release levers disengage the drive system that connects the engine power to the wheels and may be used when you need to manually push or move the mower without the engine running.

1. Locate the transmission release levers situated underneath the rear of the mower’s frame. These levers individually manage the drive wheels.

2. Unlock the levers to release the drive brakes.

3. Lock the levers for regular operation.

Remove any build-up of grass and leaves on or around the motor cover (Do not use water).

• Occasionally wipe the mower clean with a dry cloth.

• If debris builds up on the underside of the mower during use, stop the mower on level ground, disengage the PTO, set the parking brake, shut off the mower, remove the key and use compressed air to clean the area.

To ensure proper storage of the mower, follow these steps:

• Cleaning the Mower: Before storing the machine, thoroughly clean it as outlined in the previous section.

• Blade Inspection and Maintenance: Inspect the blades and either replace or sharpen them as detailed in the SERVICING THE MOWER BLADES section.

• Avoid Corrosive Materials: Keep the mower away from corrosive substances, such as fertilizer or rock salt, as these can lead to rust and corrosion on metal components like the blade, deck, motor, and frame. Keep the mower and its battery away from conductive or corrosive materials to reduce the risk of short circuit, fire, explosion and other electrical hazards.

• Child Safety: Store the machine in a location inaccessible to children to prevent accidents.

• Proper Covering: Do not cover the machine with a solid plastic sheet. Plastic coverings can trap moisture, which promotes rust and corrosion.

• Check for Wear and Tear: Thoroughly inspect the mower for any worn or damaged parts that may require replacement.

• Tire Maintenance: Avoid deflating the tires during storage.

• Storage Environment: Store the machine in a well-ventilated, clean, and dry area. Note that the battery charger cannot be used in a wet environment.

• Charging Process: Attach the charger to the designated charging port. Plug the charger into a suitable electrical outlet. Confirm that the mower is actively charging and there are no error codes displayed.

Routine maintenance should include cleaning and inspection.

1. During the battery charging process:

   • Make sure the charging plug connects securely and fully in the socket;

   • Make sure the charger operates without faults;

   • Address any faults and have them repaired before charging.

2. During the operation of the mower and when charging the battery, keep the charging port away from water and other conductive materials. Never charge when the mower is wet.

The battery charging port is located in the left back housing of the mower. Open the charging flap, and press the release button to open the port cover to charge. Close the charging flap and the cover once the charging is finished to reduce the risk of electric shock.

Charging recommendations:

• The battery does not need to be fully discharged before recharging. To maintain proper state of charge calibration, run and charge the mower at least once a month. Complete a full charge every six months.

• A battery left uncharged will slowly discharge. Before initial use each spring season, be sure battery has a full charge before mowing.

• Check the battery every six months and charge the battery if the power level is below 50%.

To charge the battery:

• Open the charging flap and the port cover from the battery charging port on the mower.

• Plug the charger into the DC battery charging port.

• Plug the charger into an AC power outlet.

• When the mower is charging, the digital display will show the charging screen only. It will display the battery percentage.

• Unplug the charger from the AC power outlet.

• Unplug the charger from the battery charging port.

Do not exceed maximum charging time: 25 hours.

Cover the battery charging port with the charging flap and the port cover before mowing to prevent foreign objects from entering and causing damage to the port.

Tire pressure should be checked periodically, and maintained at the levels shown below. Notice that these recommendations may differ slightly from the “Max Inflation” stamped on the side-wall of the tires. Exceeding the max inflation will lead to a tire explosion. The pressures shown provide proper traction and extend tire life.

Particular attention must be given to tightening the drive wheel lug nuts and blade spindle bolts. Failure to correctly torque these items may result in the loss of a wheel or blade, which can cause serious damage or personal injury.

Check lug nuts only: Check lug nuts after the first 2 hours of operation, then every 100 operating hours and following removal for repair or replacement.

1. Use a general purpose lithium-based grease 3# to lubricate the grease fittings on both front casters and the front wheel hubs. Grease the front wheel hubs and the front casters every 25 operating hours.

2. Use a general purpose lithium-based grease 3# to lubricate the oot platform pivots every 25 operating hours. Increase lubrication frequency in hot weather (above 85°F, 30°C) or dusty operating conditions.

Mower blades are sharp. Always wear gloves when handling or working near mower blades.

1. Park the mower on a flat level surface, disengage the PTO and pivot the motion control handles outward to engage the parking brake. Shut off the mower, remove the key and disconnect the contact breaker switch.

2. Use a jack stand to lift the front of the mower chassis upward for easier access to the blades. A jack stand with a minimum 550 lbs jack lift capacity is recommended. The jack stand can be put against the front hitch. Ensure the mower is secure before working underneath it.

3. Place a block of wood between the blade and the deck to prevent it from spinning while you work. Use a 24 mm socket wrench to loosen and remove the blade bolt, spacer, blade, and blade support.

A worn or damaged mower blade has the potential to break, leading to fragments being propelled into the operator’s or bystander’s area, causing severe personal harm or death. Inspect every 25 hours. Halt operation if the mower hits an object and inspect for damage.

Mower blades are sharp. Always wear gloves when handling or working near mower blades.

Inspection:

• Remove the mower blade from the mower.

• Inspect the mower blades to assess whether they are blunt and require sharpening or display signs of damage and should be replaced. Blades showing cracks, corrosion, rust, excessive wear or bending should be discarded.

Using a grinder or electric sharpener for mower blade sharpening generates sparks and metal particles that can ignite gasoline and vapors. Clear flammable materials from the area and wear safety glasses or goggles.

Sharpening:

• If the cutting edges are simply not sharp enough or have nicks, proceed to sharpen.

• Secure the blade in a vice. Then use a grinder, hand file, or electric blade sharpener to sharpen the mower blades by removing an equal amount of material from the cutting edge from each end.

• Keep the original bevel when grinding. Do not change the mower blade bevel.

• The mower blade should have a maximum cutting edge of 1/64″ (0.40 mm) or less.

An unbalanced blade can cause vibrations, mower damage, or blade failure which may result in thrown debris. Ensure blade is balanced before installing.

Balancing:

• Secure a nail in a vise, hang the blade on it, and level it.

• Assess blade balance. If an end drops, it’s heavier; sharpen it until balance is reached.

• Repeat until the blade stays horizontal and level.

Mower blades are sharp. Always wear gloves when handling or working near mower blades.

1. Install the new blades following the specified sequence: blade support, blade, spacer, and blade bolt. Ensure that the cutting edge of the blade is oriented toward the deck in the indicated order.

2. Securely tighten the blade bolts by rotating clockwise with a 24 mm socket or wrench. Torque to 118 Ft-lbs (160 Nm).

Error Code: DS 11

Error Content: Display CAN Communication Abnormal

• Check the contact breaker switch is set to “I” / ON condition.

• Check if the CAN communication wire on the display or the right wheel motor controller is well connected.

• Restart the mower.

• Contact your authorized STIHL servicing dealer.

Error Code: BMS 11

Error Content: Battery Discharging Slight Overtemp

• Mower has been put into a state of reduced performance while cooling.

• Once temperature is back within standard range, the error will automatically clear and normal operation will resume.

Error Code: BMS 12

Error Content: Battery Discharging Severe Overtemp

• Mower has been disabled while cooling.

• Once temperature is back within standard range, the mower can be restarted to clear the error and resume operation.

Error Code: BMS 13

Error Content: Battery Discharging Slight Undertemp

• Mower has been put into a state of reduced performance while warming.

• Once temperature is back within standard range, the error will automatically clear and normal operation will resume.

Error Code: BMS 14

Error Content: Battery Discharging Severe Undertemp

• Mower has been disabled while warming.

• Warming can take up to 6 hours.

• Once temperature is back within standard range, the mower can be restarted to clear the error and resume normal operation.

Error Code: BMS 15

Error Content: Battery Cells Slight Temperature Difference

• Mower has been put into a state of reduced performance while cell temperatures return to normal.

• Once temperature is back within standard range, the error will automatically clear and normal operation will resume.

Error Code: BMS 16

Error Content: Battery Cells Severe Temperature Difference

• Mower has been disabled while cell temperatures return to normal.

• This can take up to 6 hours.

• Once temperature is back within standard range, the mower can be restarted to clear the error and resume operation.

Error Code: BMS 17

Error Content: Battery Cells Slight Overvoltage

• Please stop charging. This action should correct and clear the error automatically.

• If error persists, contact your authorized STIHL servicing dealer. Mower is put into a state of reduced performance while error is present.

Error Code: BMS 18

Error Content: Battery Cells Severe Overvoltage

• Please stop charging.

• If this action does not correct the error, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: BMS 19

Error Content: Battery Cell Slight Undervoltage

• Please stop using the mower and begin charging.

• Once mower has been charged and cell voltage is within standard range, the error will automatically clear. The mower is put into a state of reduced performance while error is present.

Error Code: BMS 21

Error Content: Battery Cell Severe Undervoltage

• Please stop using the mower and begin charging it.

• If this action does not correct the error, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: BMS 23

Error Content: Insulation Resistance Severe Insufficient

• Please discontinue use of the mower, and contact your authorized STIHL servicing dealer to check mower insulation. Mower is disabled while error is present.

Error Code: BMS 24

Error Content: Battery Discharge Slight Overcurrent

• Mower has been put into a state of reduced performance while discharge current high. Attempt to reduce mower load. Once current is back within standard range, the error will automatically clear and normal operation will resume.

Error Code: BMS 25

Error Content: Battery Discharge Severe Overcurrent

• Mower has been disabled. Attempt to reduce mower load. Once discharge current is back within standard range, the mower can be restarted to clear the error and resume operation. If error persists, contact your authorized STIHL servicing dealer.

Error Code: BMS 26

Error Content: Battery Cells Voltage Slight Difference

• Please charge mower. This action should correct and clear the error.

• If error persists, contact your authorized STIHL servicing dealer. Mower is put into a state of reduced performance while cell voltages are different.

Error Code: BMS 27

Error Content: Battery Cells Voltage Severe Difference

• Please discontinue use of the mower and begin charging. If error persists after this action, contact your authorized STIHL servicing dealer. Mower is disabled while error is present.

Error Code: BMS 28

Error Content: Battery Slight Overvoltage

• Please stop charging. This action should correct and clear the error automatically. Mower is put into a state of reduced performance while error is present.

Error Code: BMS 29

Error Content: Battery Severe Overvoltage

• Please stop charging. If this action does not correct the error, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: BMS 31

Error Content: Battery Slight Undervoltage

• Please charge mower. This action should correct and clear the error automatically. If error persists, contact your authorized STIHL servicing dealer. Mower has been put into a state of reduced performance while cell voltages are different.

Error Code: BMS 32

Error Content: Battery Severe Undervoltage

• Please discontinue use of the mower, and begin charging.

• If error persists after this action, contact your authorized STIHL servicing dealer. Mower is disabled while error is present.

Error Code: BMS 33

Error Content: Battery Charging Slight Overtemp

• Charging performance reduced while temperature is high. Once temperature is within standard range, error will automatically clear and normal charging operation will resume.

Error Code: BMS 34

Error Content: Battery Charging Severe Overtemp

• Please stop charging and allow unit to cool down. If this action does not correct the error, discontinue use and contact your authorized STIHL servicing dealer.

Error Code: BMS 35

Error Content: Charging port Slight Overtemp

• Charging performance reduced while temperature is high. Once temperature is within standard range, error will automatically clear and normal charging operation will resume.

Error Code: BMS 36

Error Content: Charging Plug Severe Overtemp

• Please stop charging and allow charge port to cool down. Check for any debris that may be in charging port or plug and clear if present.

• If this action does not correct the error, discontinue use and contact your authorized STIHL servicing dealer.

Error Code: BMS 37

Error Content: Discharging B+ Contactor Welded

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: BMS 38

Error Content: Battery B- Contactor Welded

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: BMS 39

Error Content: Battery Charging Contactor Welded

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: BMS 41

Error Content: Battery Heater Contactor Welded

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: BMS 42

Error Content: Battery Current Sensor Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: BMS 43

Error Content: Battery Sampling Chip Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: BMS 44

Error Content: Battery Cell Open Circuit

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: BMS 45

Error Content: Master and Slave chips Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: BMS 47

Error Content: Charger CAN Communication Timeout

• Please attempt to reinsert charging connector and ensure it is fully seated.

• Check for any debris that may be in charging port or plug and clear if present.

• If these actions do not correct the error, discontinue use of the mower and contact your authorized STIHL servicing dealer.

Error Code: BMS 48

Error Content: Battery Precharge Failed

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: BMS 49

Error Content: Battery 12V Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: BMS 51

Error Content: Battery Heater Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: BMS 52

Error Content: Battery CC2 Detection Abnormal

• Please attempt to reinsert charging connector and ensure it is fully seated. Check for any debris that may be in charging port or plug and clear if present. If these actions do not correct the error, discontinue use of the mower and contact your authorized STIHL servicing dealer.

Error Code: BMS 53

Error Content: Battery B+ Contactor Coil Short

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: BMS 54

Error Content: Battery B- Contactor Coil Short

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: BMS 55

Error Content: Battery Precharge Contactor Coil Short

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: BMS 56

Error Content: Battery Charge Contactor Coil Short

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: BMS 57

Error Content: Battery Heating Contactor Coil Short

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: BMS 58

Error Content: Battery Continuous Discharge Overcurrent

• Mower has been put into a state of reduced performance while discharge current high. Attempt to reduce mower load. Once current is back within standard range, the error will automatically clear and normal operation will resume.

Error Code: BC 11

Error: Input Power Undervoltage

• Please stop charging and restart charger. If these actions do not correct the error, contact your authorized STIHL servicing dealer.

Error Code: BC 12

Error: Input Power Overvoltage

• Please stop charging and restart charger. If these actions do not correct the error, contact your authorized STIHL servicing dealer.

Error Code: BC 13

Error: Output Undervoltage

• Please stop charging and restart charger. If these actions do not correct the error, contact your authorized STIHL servicing dealer.

Error Code: BC 14

Error: Output Overvoltage

• Please stop charging and restart charger. If these actions do not correct the error, contact your authorized STIHL servicing dealer.

Error Code: BC 15

Error: Output Overcurrent

• Please stop charging and restart charger. If these actions do not correct the error, contact your authorized STIHL servicing dealer.

Error Code: BC 16

Error: Charger Overtemp

• Charger performance reduced while temperature is high. Once temperature is within standard range, error will automatically clear and normal charging operation will resume.

Error Code: BC 17

Error: Output Short Circuit

• Please discontinue charging. If this does not correct the error, contact your authorized STIHL servicing dealer.

Error Code: BC 18

Error: Battery Output Polarity Reversal

• Please discontinue charging. If this does not correct the error, contact your authorized STIHL servicing dealer.

Error Code: BC 19

Error: No Battery Output Voltage

• Please attempt to reinsert charging connector and ensure it is fully seated.

• Check for any debris that may be in the charging port or plug and clear if present.

• If these actions do not correct the error, discontinue use of the mower and contact your authorized STIHL servicing dealer.

Error Code: BC 21

Error: Non-Load

• Please attempt to reinsert charging connector and ensure it is fully seated.

• Check for any debris that may be in charging port or plug and clear if present.

• If these actions do not correct the error, discontinue use of the mower and contact your authorized STIHL servicing dealer.

Error Code: BC 22

Error: CAN Communication Abnormal

• Please attempt to reinsert charging connector and ensure it is fully seated.

• Check for any debris that may be in charging port or plug and clear if present.

• If these actions do not correct the error, discontinue use of the mower and contact your authorized STIHL servicing dealer.

Error Code: BC 23

Error: Internal Communication Abnormal

• Please attempt to reinsert charging connector and ensure it is fully seated.

• Check for any debris that may be in charging port or plug and clear if present.

• If these actions do not correct the error, discontinue use of the mower and contact your authorized STIHL servicing dealer.

Error Code: BC 24

Error: Charger CC1 Abnormal

• Please attempt to reinsert charging connector and ensure it is fully seated.

• Check for any debris that may be in charging port or plug and clear if present.

• If these actions do not correct the error, discontinue use of the mower and contact your authorized STIHL servicing dealer.

Error Code: TR 12

Error: Right Wheel Motor Controller Overcurrent

• Please restart mower and attempt to reduce load. Mower is disabled while error is present.

Error Code: TR 13

Error: Right Wheel Motor Controller Current Sensor Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 14

Error: Right Wheel Motor Controller Precharge Failed

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 15

Error: Right Wheel Motor Controller Severe Undertemp

• Please ensure ambient temperature is above -40°F and restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 16

Error: Right Wheel Motor Controller Severe Overtemp

• Please allow motor controller to cool and restart mower. Attempt to reduce load on right wheel.

• If these actions do not correct the error, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 19

Error: Right Wheel Motor Controller Speed Limit Supervision

• Right wheel speed is faster than mower max speed. Restart mower and ensure mower is operating within standard speed range.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 1A

Error: Right Wheel Motor Not Stopped

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 1D

Error: Right Wheel Motor Controller Reset Rejected

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 1E

Error: Right Wheel Motor Short

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 22

Error: Right Wheel Motor Controller Overtemp Cutback

• Mower has been put into a state of reduced performance while motor controller temperature high. Attempt to reduce mower load and allow controller to cool. Once temperature is back within standard range, restart the mower and normal operation will resume.

Error Code: TR 25

Error: Right Wheel Motor Controller Ext 5V Supply Failure

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 26

Error: Right Wheel Motor Controller Ext 12V Supply Failure

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 28

Error: Right Wheel Motor Slight Overtemp

• Mower has been put into a state of reduced performance while motor temperature high. Attempt to reduce mower load and allow motor to cool. Once temperature is back within standard range, restart the mower and normal operation will resume.

Error Code: TR 29

Error: Right Wheel Motor Temperature Sensor Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 31

Error: Main Contactor Coil Driver Short /Open

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 36

Error: Right Wheel Motor Sin/Cos Encoder Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 37

Error: Right Wheel Motor Phase Open

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 38

Error: Main Contactor Welded

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 39

Error: Main Contactor Did Not Close

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 3A

Error: Right Wheel Motor Controller Setup Needed

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 41

Error: Right Throttle Wiper High

• Please check throttle connection and restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 42

Error: Right Throttle Input Abnormal

• Please check throttle connection and restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 43

Error: Right Pot2 Wiper High

• Please check throttle connection and restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 46

Error: Right Wheel Motor Controller NV Memory Failure

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 51

Error: Display CAN Communication Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 52

Error: Left Wheel Motor Controller CAN Communication Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 53

Error: Mower Initial State Detection Abnormal

• Please check if the left and right levers are in the park position and the PTO is pressed.

• Restart the mower.

Error Code: TR 55

Error: BMS CAN Communication Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 56

Error: Operator Presence Detection Abnormal

• Please make sure the Operator Presence Switch is closed before operating the left and right levers.

• Please restart the mower.

Error Code: TR 58

Error: Right Blade Motor Controller CAN Communication Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 59

Error: Limp Home Mode has been activated

• Theft Protection Activated: contact mower owner to unlock the mower.

Error Code: TR 5B

Error: Right Parking Brake Manually Disengaged and Not Reset

• Detected right parking brake is not engaged. Re-engage parking brake.

Error Code: TR 61

Error: GPS Module CAN Communication Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 63

Error: Left Blade Motor Controller CAN Communication Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 64

Error: Second Left Blade Motor Controller CAN Communication Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 65

Error: Middle Blade Motor Controller CAN Communication Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 66

Error: Second Right Blade Motor Controller CAN Communication Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 67

Error: Blade Speed Exceeds Limit

• Please restart the mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 73

Error: Right Wheel Motor Stall Detected

• Please restart mower and attempt to reduce load.

• If these actions do not correct the error, contact your authorized STIHL servicing dealer. Mower is disabled while error is present.

Error Code: TR 77

Error: Right Wheel Motor Controller Supervision Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 79

Error: Right Wheel Motor Controller Supervision Input Check

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 83

Error: Right Wheel Motor Controller Internal Hardware

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR 87

Error: Right Wheel Motor Controller Motor Characterization Error

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR A1

Error: Rear ETO Contactor Coil Driver Short/Open

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR A2

Error: Right Wheel Motor Controller EM Brake Driver Short/Open

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR A3

Error: Front ETO Contactor Coil Driver Short/Open

• Please check front ETO port and ensure it is free of debris and restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR A4

Error: Auto power off Contactor Coil Driver Short/Open

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR A9

Error: Right Wheel Motor Controller Coil Supply

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR B1

Error: Right Wheel Motor Controller Analog 1 Out of Range

• Please check throttle connection and restart vehicle.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TR D2

Error: Right Wheel Motor Controller Phase PWM Mismatch

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL 12

Error: Left Wheel Motor Controller Overcurrent

• Please restart mower and attempt to reduce load. Mower is disabled while error is present.

Error Code: TL 13

Error: Left Wheel Motor Controller Current Sensor Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL 14

Error: Left Wheel Motor Controller Precharge Failed

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL 15

Error: Left Wheel Motor Controller Severe Undertemp

• Please ensure ambient temperature is above -40°F and restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL 16

Error: Left Wheel Motor Controller Severe Overtemp

• Please allow motor controller to cool and restart mower. Attempt to reduce load on left wheel. If these actions do not correct the error, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL 19

Error: Left Wheel Motor Controller Speed Limit Supervision

• Left wheel speed is faster than mower max speed. Restart mower and ensure mower is operating within standard speed range. If error persists contact, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL 1A

Error: Left Wheel Motor Not Stopped

• Please restart mower. If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL 1D

Error: Left Wheel Motor Controller Reset Rejected

• Please restart mower. If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL 1E

Error: Left Wheel Motor Short

• Please restart mower. If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL 22

Error: Left Wheel Motor Controller Overtemp Cutback

• Mower has been put into a state of reduced performance while motor controller temperature high. Attempt to reduce mower load and allow controller to cool. Once temperature is back within standard range, restart the mower and normal operation will resume.

Error Code: TL 25

Error: Left Wheel Motor Controller Ext 5V Supply Failure

• Please restart mower. If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL 26

Error: Left Wheel Motor Controller Ext 12V Supply Failure

• Please restart mower. If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL 28

Error: Left Wheel Motor Slight Overtemp

• Mower has been put into a state of reduced performance while motor temperature high. Attempt to reduce mower load and allow motor to cool. Once temperature is back within standard range, restart the mower and normal operation will resume.

Error Code: TL 29

Error: Left Wheel Motor Temperature Sensor Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer. Mower is disabled while error is present.

Error Code: TL 31

Error: Main Contactor Coil Driver Short /Open

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL 36

Error: Left Wheel Motor Sin/Cos Encoder Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL 37

Error: Left Wheel Motor Phase Open

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL 38

Error: Main Contactor Welded

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL 39

Error: Main Contactor Did Not Close

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL 3A

Error: Left Wheel Motor Controller Setup Needed

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL 41

Error: Left Throttle Wiper High

• Please check throttle connection and restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL 42

Error: Left Throttle Input Abnormal

• Please check throttle connection and restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL 43

Error: Left Pot2 Wiper High

• Please check throttle connection and restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL 46

Error: Left Wheel Motor Controller NV Memory Failure

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL 52

Error: Right Wheel Motor Controller CAN Communication Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL 5B

Error: Left Parking Brake Manually Disengaged and Not Reset

• Detected left parking brake is not engaged. Re-engage parking brake.

Error Code: TL 73

Error: Left Wheel Motor Stall Detected

• Please restart mower and attempt to reduce load.

• If these actions do not correct the error, contact your authorized STIHL servicing dealer. Mower is disabled while error is present.

Error Code: TL 77

Error: Left Wheel Motor Controller Supervision Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL 79

Error: Left Wheel Motor Controller Supervision Input Check

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL 83

Error: Left Wheel Motor Controller Internal Hardware

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL 87

Error: Left Wheel Motor Controller Motor Characterization Error

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL A2

Error: Left Wheel Motor Controller EM Brake Driver Short/Open

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL A3

Error: Deck Linear Actuator Driver Coil Short/Open

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL A4

Error: Deck Linear Actuator Driver Coil Short/Open

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL A9

Error: Left Wheel Motor Controller Coil Supply

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL B1

Error: Left Wheel Motor Controller Analog 1 Out of Range

• Please check throttle connection and restart vehicle.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: TL D2

Error: Left Wheel Motor Controller Phase PWM Mismatch

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Mower is disabled while error is present.

Error Code: ML 11

Error: Left Blade Motor Controller Hardware Overvoltage or Overcurrent

• Please reduce the blade load and restart the mower. Check that blades are free of debris. Blades are disabled while error present.

Error Code: ML 12

Error: Left Blade Motor Controller Overcurrent

• Please reduce the blade load and restart PTO. Check that blades are free of debris. Blades are disabled while error present.

Error Code: ML 13

Error: Left Blade Motor Controller Overvoltage

• Please restart PTO to clear error. Blades are disabled while error present.

Error Code: ML 14

Error: Left Blade Motor Controller Undervoltage

• Please restart PTO to clear error. Blades are disabled while error present.

Error Code: ML 16

Error: Left Blade Motor Phase Open

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Blades are disabled while error is present.

Error Code: ML 17

Error: Left Blade Motor Controller Severe Overtemp

• Please reduce the blade load. Allow controller to cool and restart mower. Check that blades are free of debris. Blades are disabled until unit restart.

Error Code: ML 18

Error: Left Blade Motor Controller EEPROM Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Blades are disabled while error is present.

Error Code: ML 21

Error: Left Blade Motor Stall Detected

• Please reduce the blade load and restart the PTO. Check that blades are free of debris. Blades are disabled while error present.

Error Code: ML 22

Error: Left Blade Motor System Start Failure

• Please reduce the blade load and restart the PTO. Check that blades are free of debris. Blades are disabled while error present.

Error Code: ML 23

Error: Left Blade Motor Controller Precharge Failed

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Blades are disabled while error is present.

Error Code: ML 24

Error: CAN Communication with Right Wheel Motor Controller Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Blades are disabled while error is present.

Error Code: ML 26

Error: Left Blade Motor Controller MOSFET Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Blades are disabled while error is present.

Error Code: ML 27

Error: Left Blade Motor Controller Temperature Sensor Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Blades are disabled while error is present.

Error Code: ML 28

Error: Left Blade Motor Controller Self-Check Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Blades are disabled while error is present.

Error Code: MM 11

Error: Middle Blade Motor Controller Hardware Overvoltage or Overcurrent

• Please reduce the blade load and restart the mower. Check that blades are free of debris. Blades are disabled while error present.

Error Code: MM 12

Error: Middle Blade Motor Controller Overcurrent

• Please reduce the blade load and restart PTO. Check that blades are free of debris. Blades are disabled while error present.

Error Code: MM 13

Error: Middle Blade Motor Controller Overvoltage

• Please restart PTO to clear error. Blades are disabled while error present.

Error Code: MM 14

Error: Middle Blade Motor Controller Undervoltage

• Please restart PTO to clear error. Blades are disabled while error present.

Error Code: MM 16

Error: Middle Blade Motor Phase Open

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Blades are disabled while error is present.

Error Code: MM 17

Error: Middle Blade Motor Controller Severe Overtemp

• Please reduce the blade load. Allow controller to cool and restart mower. Check that blades are free of debris. Blades are disabled until unit restart.

Error Code: MM 18

Error: Middle Blade Motor Controller EEPROM Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Blades are disabled while error is present.

Error Code: MM 21

Error: Middle Blade Motor Stall Detected

• Please reduce the blade load and restart the PTO. Check that blades are free of debris. Blades are disabled while error present.

Error Code: MM 22

Error: Middle Blade Motor System Start Failure

• Please reduce the blade load and restart the PTO. Check that blades are free of debris. Blades are disabled while error present.

Error Code: MM 23

Error: Middle Blade Motor Controller Precharge Failed

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Blades are disabled while error is present.

Error Code: MM 24

Error: CAN Communication with Right Wheel Motor Controller Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Blades are disabled while error is present.

Error Code: MM 26

Error: Middle Blade Motor Controller MOSFET Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Blades are disabled while error is present.

Error Code: MM 27

Error: Middle Blade Motor Controller Temperature Sensor Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Blades are disabled while error is present.

Error Code: MM 28

Error: Middle Blade Motor Controller Self-Check Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Blades are disabled while error is present.

Error Code: MR 11

Error: Right Blade Motor Controller Hardware Overvoltage or Overcurrent

• Please reduce the blade load and restart the mower. Check that blades are free of debris. Blades are disabled while error present.

Error Code: MR 12

Error: Right Blade Motor Controller Overcurrent

• Please reduce the blade load and restart PTO. Check that blades are free of debris. Blades are disabled while error present.

Error Code: MR 13

Error: Right Blade Motor Controller Overvoltage

• Please restart PTO to clear error. Blades are disabled while error present.

Error Code: MR 14

Error: Right Blade Motor Controller Undervoltage

• Please restart PTO to clear error. Blades are disabled while error present.

Error Code: MR 16

Error: Right Blade Motor Phase Open

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Blades are disabled while error is present.

Error Code: MR 17

Error: Right Blade Motor Controller Severe Overtemp

• Please reduce the blade load. Allow controller to cool and restart mower. Check that blades are free of debris. Blades are disabled until unit restart.

Error Code: MR 18

Error: Right Blade Motor Controller EEPROM Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Blades are disabled while error is present.

Error Code: MR 21

Error: Right Blade Motor Stall Detected

• Please reduce the blade load and restart the PTO. Check that blades are free of debris. Blades are disabled while error present.

Error Code: MR 22

Error: Right Blade Motor System Start Failure

• Please reduce the blade load and restart the PTO. Check that blades are free of debris. Blades are disabled while error present.

Error Code: MR 23

Error: Right Blade Motor Controller Precharge Failed

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Blades are disabled while error is present.

Error Code: MR 24

Error: CAN Communication with Right Wheel Motor Controller Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Blades are disabled while error is present.

Error Code: MR 26

Error: Right Blade Motor Controller MOSFET Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Blades are disabled while error is present.

Error Code: MR 27

Error: Right Blade Motor Controller Temperature Sensor Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Blades are disabled while error is present.

Error Code: MR 28

Error: Right Blade Motor Controller Self-Check Abnormal

• Please restart mower.

• If error persists, contact your authorized STIHL servicing dealer and discontinue use of the mower. Blades are disabled while error is present.