PANASONIC CU-E10HBEA (01) PDF Document

Read the “SAFETY PRECAUTIONS” carefully before performing any servicing. Electrical work must be installed or serviced by a licensed electrician. Be sure to use the correct rating of the power plug and main circuit for the model installed. Do not modify the machine, part, or material during repairing service. If a wiring unit is supplied as a repairing part, do not repair or connect the wire even if only a partial wire break exists; exchange the whole wiring unit. Do not wrench the fasten terminal; pull it out or insert it straightly. Engage a dealer or specialist for installation and servicing; if installation or servicing done by the user is defective, it will cause water leakage, electrical shock, or fire. Install according to the installation instructions strictly; if installation is defective, it will cause water leakage, electric shock, or fire. Use the attached accessories parts and specified parts for installation and servicing; otherwise, it will cause the set to fall, water leakage, fire, or electrical shock. Install at a strong and firm location which is able to withstand the set’s weight; if the strength is not enough or installation is not properly done, the set will drop and cause injury. For electrical work, follow the local national wiring standard, regulation, and the installation instruction. An independent circuit and single outlet must be used; if electrical circuit capacity is not enough or defect found in electrical work, it will cause electrical shock or fire. It is strongly recommended to install this equipment with an Earth Leakage Circuit Breaker (ELCB) or Residual Current Device (RCD); otherwise, it may cause electrical shock and fire in case of equipment breakdown or insulation breakdown. Do not use a joint cable for indoor / outdoor connection cable; use the specified indoor / outdoor connection cable, refer to the installation instruction CONNECT THE CABLE TO THE INDOOR UNIT and connect tightly for indoor / outdoor connection. Clamp the cable so that no external force will be acted on the terminal; if connecting or fixing is not perfect, it will cause heat up or fire at the connection. Wire routing must be properly arranged so that the control board cover is fixed properly; if the control board cover is not fixed perfectly, it will cause heat-up or fire at the connection point of the terminal, fire, or electrical shock. When installing or relocating the air conditioner, do not let any substance other than the specified refrigerant, e.g., air, etc., mix into the refrigeration cycle (piping); mixing of air etc. will cause abnormal high pressure in the refrigeration cycle and result in explosion, injury, etc. Do not install the outdoor unit near a handrail of a veranda. When installing an air-conditioner unit at a veranda of a high-rise building, a child may climb up to the outdoor unit and cross over the handrail, causing an accident. This equipment must be properly earthed; the earth line must not be connected to a gas pipe, water pipe, earth of a lightning rod, and telephone; otherwise, it may cause electric shock in case of equipment breakdown or insulation breakdown. Keep away from small children; the thin film may cling to the nose and mouth and prevent breathing. Do not use an unspecified cord, modified cord, joint cord, or extension cord for the power supply cord. Do not share the single outlet with other electrical appliances; poor contact, poor insulation, or overcurrent will cause electrical shock or fire. Tighten the flare nut with a torque wrench according to the specified method; if the flare nut is over-tightened, after a long period, the flare may break and cause refrigerant gas leakage. In case of using existing (R22) pipes during installation of R410 models, you must carry out pump down properly to collect back the refrigerant and oil before installation of a new unit. The thickness of copper pipes used with R410A must be more than 0.6mm; never use copper pipes thinner than 0.6mm. It is desirable that the amount of residual oil is less than 40 mg/10m. During installation, install the refrigerant piping properly before running the compressor; operation of the compressor without fixing refrigeration piping and valves at an opened condition will cause suck-in of air, abnormal high pressure in the refrigeration cycle, and result in explosion, injury, etc. During pump down operation, stop the compressor before removing the refrigerant piping; removal of refrigeration piping while the compressor is operating and valves are opened condition will cause suck-in of air, abnormal high pressure in the refrigeration cycle, and result in explosion, injury, etc. After completion of installation or service, confirm there is no leakage of refrigerant gas; it may generate toxic gas when the refrigerant contacts with fire. Ventilate if there is refrigerant gas leakage during operation; it may cause toxic gas when the refrigerant contacts with fire. Do not insert your fingers or other objects into the unit; a high-speed rotating fan may cause injury. Must not use other parts except original parts described in the catalog and manual.

Do not install the unit at a place where leakage of flammable gas may occur; in case gas leaks and accumulates at the surrounding of the unit, it may cause fire. Carry out drainage piping as mentioned in installation instructions; if drainage is not perfect, water may enter the room and damage the furniture. Tighten the flare nut with a torque wrench according to the specified method; if the flare nut is over-tightened, after a long period, the flare may break and cause refrigerant gas leakage. Do not touch the outdoor unit air inlet and aluminum fin; it may cause injury. Select an installation location which is easy for maintenance. Pb free solder has a higher melting point than standard solder; typically the melting point is 50°F – 70°F (30°C – 40°C) higher; please use a high-temperature solder iron; in case of the soldering iron with temperature control, please set it to 700 ± 20°F (370 ± 10°C); Pb free solder will tend to splash when heated too high (about 1100°F / 600°C). Power supply connection to the air conditioner: Connect the power supply cord of the air conditioner to the mains using one of the following methods: The power supply point shall be the place where there is ease for access for the power disconnection in case of emergency; in some countries, permanent connection of this room air conditioner to the power supply is prohibited. Power supply connection to the receptacle using a power plug: Use an approved 15/16A (1.0 ~ 1.75HP) or 16A (2.0HP) or 20A (2.5HP) power plug with an earth pin for the connection to the socket. Power supply connection to a circuit breaker for the permanent connection: Use an approved 16A (1.0 ~ 2.0HP) or 20A (2.5HP) circuit breaker for the permanent connection; it must be a double pole switch with a minimum 3.0 mm contact gap. Do not release refrigerant during piping work for installation, servicing, reinstallation, and during repairing a refrigerant parts; take care of the liquid refrigerant, it may cause frostbite. Installation or servicing work may need two people to carry out the installation or servicing work. Do not install this appliance in a laundry room or other location where water may drip from the ceiling, etc. Do not sit or step on the unit; you may fall down accidentally. Do not touch the sharp aluminum fin; sharp parts may cause injury. During pump down operation, stop the compressor before removing the refrigerant piping; removal of refrigeration piping while the compressor is operating and valves are opened condition will cause suck-in of air, abnormal high pressure in the refrigeration cycle, and result in explosion, injury, etc. After completion of installation or service, confirm there is no leakage of refrigerant gas; it may generate toxic gas when the refrigerant contacts with fire. Ventilate if there is refrigerant gas leakage during operation; it may cause toxic gas when the refrigerant contacts with fire. Do not insert your fingers or other objects into the unit; a high-speed rotating fan may cause injury. Must not use other parts except original parts described in the catalog and manual.

The specifications for the PANASONIC CS-E10JD3EA INDOOR and CU-E10HBEA OUTDOOR units under EUROVENT / AS Performance Test Condition (Single, 50 Phase, Hz) are as follows:

The Fan specifications for the PANASONIC CS-E10JD3EA INDOOR and CU-E10HBEA OUTDOOR units are:

The Airflow and Refrigeration Cycle specifications for the PANASONIC CS-E10JD3EA INDOOR and CU-E10HBEA OUTDOOR units are:

The Heat Exchanger specifications for the PANASONIC CS-E10JD3EA INDOOR and CU-E10HBEA OUTDOOR units are:

The Indoor and Outdoor Operation Ranges for the PANASONIC CU-E10HBEA are:

The features of the PANASONIC CU-E10HBEA include:

Inverter Technology:

• Wider output power range
• Energy saving
• Quick Cooling
• Quick Heating
• More precise temperature control

Environment Protection:

• Non-ozone depletion substances refrigerant (R410A)

Long Installation Piping:

• Long piping up to 20 meter (E10/15HBEA)

Easy to use remote control

Quality Improvement:

• Random auto restart after power failure for safety restart operation
• Gas leakage protection
• Prevent compressor reverse cycle
• Inner protector to protect compressor
• Noise prevention during soft dry operation

Operation Improvement:

• Quiet mode to reduce the indoor unit operating sound
• Powerful mode to reach the desired room temperature quickly
• 24-hour timer setting

Serviceability Improvement:

• Breakdown Self Diagnosis function

For Cooling Operation thermostat control on the PANASONIC CU-E10HBEA:

Compressor is OFF when Intake Air Temperature – Internal Setting Temperature < -1.5°C.

Compressor is ON after waiting for 3 minutes, if the Intake Air Temperature – Internal Setting Temperature > Compressor OFF point.

For Soft Dry Operation thermostat control on the PANASONIC CU-E10HBEA:

Compressor is OFF when Intake Air Temperature – Internal Setting Temperate < -2.0°C.

Compressor is ON after waiting for 3 minutes, if the Intake Air Temperature – Internal Setting Temperature > Compressor OFF point.

For Heating Operation thermostat control on the PANASONIC CU-E10HBEA:

Compressor is OFF when Intake Air Temperature – Internal Setting Temperate > +2.0°C.

Compressor is ON after waiting for 3 minutes, if the Intake Air Temperature – Internal Setting Temperature < Compressor OFF point.

The control contents for Quiet operation in Cooling Mode/Cooling area of Soft Dry Mode on the PANASONIC CU-E10HBEA are as follows:

Auto fan speed is changed from normal setting to quiet setting of respective fan speed. This is to reduce sound of Hi, Me, Lo for 3dB.

Manual fan speed for quiet operation is 1 step from setting fan speed.

Outdoor fan speed is changed to Q-Lo.

Compressor frequency is reduced.

The control contents for Quiet operation in Heating mode on the PANASONIC CU-E10HBEA are:

Fan Speed Auto:

• Indoor FM RPM depends on pipe temperature sensor of indoor heat exchanger.
• Auto fan speed is changed from normal setting to quiet setting of respective fan speed. This is to reduce sound of Hi, Me, Lo for 3dB.

Fan Speed Manual:

• Manual fan speed for quiet operation is – 1 step from setting fan speed.

Compressor frequency is reduced.

When the powerful mode is selected on the PANASONIC CU-E10HBEA, the internal setting temperature will shift higher up to 3.5°C (for Heating) or lower up to 2°C (for Cooling/Soft Dry) than the remote control setting temperature for 20 minutes to achieve the setting temperature quickly.

The ON Timer Control for the PANASONIC CU-E10HBEA allows the unit with timer set to start operating earlier than the setting time to provide a comfortable environment when reaching the set ON time. 60 minutes before the set time, the indoor fan motor (at fan speed of Lo-) and outdoor fan motor start operating for 30 seconds to determine the indoor intake air temperature and outdoor air temperature in order to judge the operation starting time. The decided operation will start operating earlier than the set time based on this judgment.

When the power supply is cut off during the operation of the PANASONIC CU-E10HBEA air conditioner, the compressor will re-operate within three to four minutes (there are 10 patterns between 2 minutes 58 seconds and 3 minutes 52 seconds to be selected randomly) after the power supply resumes. This type of control is not applicable during ON/OFF Timer setting.

The Indication Panel LED meanings for the PANASONIC CU-E10HBEA are:

Note: If the OFF/ON operation LED is OFF and the OFF indicator does not show on the remote control display, an abnormality operation occurs.

The Restart Control (Time Delay Safety Control) for the PANASONIC CU-E10HBEA means:

The Compressor will not turn on within 3 minutes from the moment operation stops, although the unit is turned on again by pressing the OFF/ON button at the remote control within this period.

This control is not applicable if the power supply is cut off and on again.

This phenomenon is to balance the pressure inside the refrigerant cycle.

Once the air conditioner PANASONIC CU-E10HBEA is turned on, the compressor will not stop within 30 seconds in a normal operation although the intake air temperature has reached the thermo-off temperature. However, a force stop by pressing the OFF/ON button at the remote control is permitted, or the Auto OFF/ON button at the indoor unit is permitted. The reason for the compressor to force operation for a minimum of 30 seconds is to allow the refrigerant oil to run in a full cycle and return back to the outdoor unit.

For the PANASONIC CU-E10HBEA outdoor unit total running current control:

When the outdoor unit total running current (AC) exceeds the X value, the frequency instructed for compressor operation will be decreased.

If the running current does not exceed the X value for five seconds, the frequency instructed will be increased.

However, if the total outdoor unit running current exceeds the Y value, the compressor will be stopped immediately for 3 minutes.

The first 30 minutes of cooling operation, (A) will be applied. The X (A) and Y (A) values for the E10HB model in Cooling/Soft Dry (A) & (C) mode are 4.95 A and 15.06 A, respectively. In Cooling/Soft Dry (B) mode, they are 4.43 A and 15.06 A. In Heating mode, they are 6.21 A and 15.06 A.

For Overheating Prevention Control on the PANASONIC CU-E10HBEA:

When the IPM temperature rises to 110°C, compressor operation will stop immediately.

Compressor operation restarts after three minutes when the temperature decreases to 95°C.

For DC Peak Current Control:

When the electric current to IPM exceeds the set value of 22.33 ± 5.0 A, the compressor will stop operation. Then, operation will restart after three minutes.

If the set value is exceeded again more than 30 seconds after the compressor starts, the operation will restart after two minutes.

If the set value is exceeded again within 30 seconds after the compressor starts, the operation will restart after one minute. If this condition repeats continuously for seven times, all indoor and outdoor relays will be cut off.

The instructed frequency for compressor operation on the PANASONIC CU-E10HBEA is regulated by the compressor discharge temperature. If the compressor discharge temperature exceeds 112°C, the compressor will stop. This occurs 4 times per 20 minutes, and the timer LED will be blinking (“F97” is to be confirmed).

The compressor operating frequency on the PANASONIC CU-E10HBEA is regulated according to the outdoor air temperature as shown in the diagram. This control will begin 1 minute after the compressor starts. The compressor frequency will adjust based on the Outdoor Air Temperature.

For Cooling Overload Control on the PANASONIC CU-E10HBEA:

The system detects the Outdoor pipe temperature and carries out below restriction/limitation (Limit the compressor Operation frequency).

The compressor stops if the outdoor pipe temperature exceeds 63°C.

If the compressor stops 4 times in 20 minutes, the Timer LED blinks (F95: outdoor high pressure rise protection).

Dew Prevention Control 1 on the PANASONIC CU-E10HBEA is to prevent dew formation at the indoor unit discharge area.

This control activates if:

• Outdoor air temperature and Indoor pipe temperature judgment by microcontroller is fulfilled.
• Cooling or Dry mode is operated for more than 20 minutes or more.

This control stops if:

• Compressor stopped.
• Remote control setting changed (fan speed / temperature).
• Outdoor air temperature and indoor intake temperature changed.

Dew Prevention Control 2 on the PANASONIC CU-E10HBEA is to prevent dew formation at the indoor unit discharge area.

This control starts if all conditions continue for 20 minutes:

• Operated with Cooling or Soft Dry Mode.
• Indoor intake temperature is between 25°C and 29°C.
• Outdoor air temperature is less than 30°C.
• Quiet Lo fan speed.

This control stops if:

• When receiving an air swing change signal from the Remote Control.

The Freeze Prevention Control for the PANASONIC CU-E10HBEA operates as follows:

When the indoor heat exchanger temperature is lower than 7°C continuously for six minutes, the compressor will stop operating.

The compressor will resume its operation 3 minutes after the indoor heat exchanger is higher than 13°C.

At the same time, the indoor fan speed will be higher than during its normal operation.

If the indoor heat exchanger temperature is higher than 13°C for 5 minutes, the fan speed will return to its normal operation.

The compressor on the PANASONIC CU-E10HBEA will operate at maximum frequency if the indoor intake air temperature is 30°C or above during Heating Operation.

The compressor operating frequency on the PANASONIC CU-E10HBEA is regulated in accordance to the indoor heat exchanger temperature as shown in the figure. If the heat exchanger temperature exceeds 60°C, the compressor will stop.

When the indoor pipe temperature is low during Heating Operation for the PANASONIC CU-E10HBEA, cold draught operation starts where the indoor fan speed will be reduced.

When the outdoor pipe temperature and outdoor temperature are low during Heating Operation for the PANASONIC CU-E10HBEA, deice operation starts where the indoor fan motor and outdoor fan motor stop and the operation LED blinks.

The Test Run operation for the PANASONIC CU-E10HBEA is activated by short-circuiting CN-S at the outdoor unit PCB after applying power between the terminal 1 and 2. The unit is forced to run the rated frequency cooling operation mode.

For the PANASONIC CU-E10HBEA in Cooling Mode, the standard values for Normal Pressure and Outlet Air Temperature are:

Condition: Indoor fan speed High, Outdoor temperature 35°C at cooling mode and 7°C at heating mode. Compressor operates at rated frequency.

For the PANASONIC CU-E10HBEA in Heating Mode, the standard values for Normal Pressure and Outlet Air Temperature are:

Condition: Indoor fan speed High, Outdoor temperature 35°C at cooling mode and 7°C at heating mode. Compressor operates at rated frequency.

The relationship between the condition of the PANASONIC CU-E10HBEA air conditioner and the pressure and electric current in Cooling Mode is:

Carry out the measurements of pressure, electric current, and temperature fifteen minutes after an operation is started.

The relationship between the condition of the PANASONIC CU-E10HBEA air conditioner and the pressure and electric current in Heating Mode is:

Carry out the measurements of pressure, electric current, and temperature fifteen minutes after an operation is started.

To diagnose a PANASONIC CU-E10HBEA malfunction indicated by error code H00 (no abnormality detected) using the Self Diagnosis Function:

To make a diagnosis:

1. Turn the power supply ON.
2. Press CHECK button continuously for 5 seconds.
3. ” – -” will be displayed on the remote controller display.
4. Press the timer UP or DOWN button on the remote control. The error code “H00” (no abnormality) will be displayed.
5. Every press of the button (UP or DOWN) will increase the error code number.
6. When the displayed error code matches the unit’s error code, the OFF/ON operation LED will be ON continuously.
7. The breakdown diagnosis mode will be cancelled by pressing the CHECK button continuously for 5 seconds or waiting for 30 seconds.

If any error occurred, pressing the AC Reset button will reset the error code so that the unit will be able to operate and recheck if any error occurred.

To display memorized error status:

1. Turn ON the power supply.
2. Press CHECK button continuously for 5 seconds.
3. ” – -” will be displayed on the remote controller display.
4. Press the timer UP or DOWN button on the remote control. The error code “H00” (no abnormality) will be displayed.
5. Every press of the button (UP or DOWN) will increase the error code number.
6. When the displayed error code matches the unit’s error code, the OFF/ON operation LED will be ON continuously.
7. The breakdown diagnosis mode will be cancelled by pressing the CHECK button continuously for 5 seconds or waiting for 30 seconds.

For the H11 error code (Indoor / outdoor abnormal communication) on the PANASONIC CU-E10HBEA, the abnormality is judged after > 1 min. after starting operation, and the emergency operation is Indoor fan operation only. The primary locations to verify are:

• Internal / external cable connections
• Indoor / Outdoor PCB

For the H14 error code (Indoor intake air temperature sensor abnormality) on the PANASONIC CU-E10HBEA, the abnormality is judged by “Continue for 5 sec.”. There is no emergency operation. The primary locations to verify are:

• Intake air temperature sensor (defective or disconnected)

For the H15 error code (Outdoor compressor temperature sensor abnormality) on the PANASONIC CU-E10HBEA, the abnormality is judged by “Continue for 5 sec.”. There is no emergency operation. The primary locations to verify are:

• Compressor temperature sensor (defective or disconnected)

For the H16 error code (Outdoor Current Transformer open circuit) on the PANASONIC CU-E10HBEA, the abnormality is judged by a CT detected input current less than 0.65A for continuously 20 seconds. There is no emergency operation. The primary locations to verify are:

• Outdoor PCB
• IPM (Power transistor) module

For the H19 error code (Indoor fan motor mechanism lock) on the PANASONIC CU-E10HBEA, there is no specified abnormality judgment or emergency operation. The primary locations to verify are:

• Indoor PCB
• Fan motor

For the H23 error code (Indoor pipe temperature sensor 1 abnormality) on the PANASONIC CU-E10HBEA, the abnormality is judged by “Continue for 5 sec.”, and the emergency operation is “O (Cooling only)”. The primary location to verify is:

• Heat exchanger temperature sensor 1 (defective or disconnected)

For the H24 error code (Indoor pipe temperature sensor 2 abnormality) on the PANASONIC CU-E10HBEA, the abnormality is judged by “Continue for 5 sec.”. There is no emergency operation. The primary locations to verify are:

• Heat exchanger temperature sensor 2 (defective or disconnected)

For the H27 error code (Outdoor air temperature sensor abnormality) on the PANASONIC CU-E10HBEA, the abnormality is judged by “Continue for 5 sec.”, and the emergency operation is “O”. The primary location to verify is:

• Outdoor temperature sensor (defective or disconnected)

For the H28 error code (Outdoor heat exchanger temperature sensor abnormality) on the PANASONIC CU-E10HBEA, the abnormality is judged by “Continue for 5 sec.”, and the emergency operation is “O”. The primary location to verify is:

• Outdoor heat exchanger temperature sensor (defective or disconnected)

For the H30 error code (Discharge temperature sensor abnormality) on the PANASONIC CU-E10HBEA, the abnormality is judged by “Continue for 5 sec.”. There is no emergency operation. The primary location to verify is:

• Discharge temperature sensor

For the H97 error code (Outdoor Fan Motor lock abnormality) on the PANASONIC CU-E10HBEA, the abnormality is judged by “2 times occurrence within 30 minutes”. There is no emergency operation. The primary locations to verify are:

• Outdoor PCB
• Outdoor Fan Motor

For the H98 error code (Indoor high pressure protection) on the PANASONIC CU-E10HBEA, the error code will not display but is stored in EEPROM, with the abnormality judged by the indoor pipe temperature sensor being above 60°C during heating operation. There is no emergency operation. The primary locations to verify are:

• Air filter dirty
• Air circulation short circuit
• Insufficient refrigerant
• Indoor unit PCB

For the H99 error code (Indoor heat exchanger anti-freezing protection) on the PANASONIC CU-E10HBEA, the error code will not display but is stored in EEPROM, with the abnormality judged when the indoor pipe temperature is lower than 2°C. There is no emergency operation. The primary locations to verify are:

• Insufficient refrigerant
• Air filter dirty

For the F11 error code (Cooling / Heating cycle changeover abnormality) on the PANASONIC CU-E10HBEA, the abnormality is judged by “4 times occurrence within 30 minutes”. There is no emergency operation. The primary locations to verify are:

• 4-way valve
• V-coil

For the F90 error code (PFC control) on the PANASONIC CU-E10HBEA, the abnormality is judged by “4 times occurrence within 10 minutes”. There is no emergency operation. The primary location to verify is:

• Voltage at PFC

For the F91 error code (Refrigeration cycle abnormality) on the PANASONIC CU-E10HBEA, the abnormality is judged by “2 times occurrence within 20 minutes”. There is no emergency operation. The primary locations to verify are:

• No refrigerant (3-way valve is closed)

For the F93 error code (Outdoor compressor abnormal revolution) on the PANASONIC CU-E10HBEA, the abnormality is judged by “4 times occurrence within 20 minutes”. There is no emergency operation. The primary location to verify is:

• Outdoor compressor

For the F95 error code (Cool high pressure protection) on the PANASONIC CU-E10HBEA, the abnormality is judged by “4 times occurrence within 20 minutes”. There is no emergency operation. The primary locations to verify are:

• Outdoor refrigerant circuit

For the F96 error code (IPM (power transistor) overheating protection) on the PANASONIC CU-E10HBEA, there is no specified abnormality judgment or emergency operation. The primary locations to verify are:

• Excess refrigerant
• Improper heat radiation
• IPM (Power transistor)

For the F97 error code (Outdoor compressor overheating protection) on the PANASONIC CU-E10HBEA, the abnormality is judged by “4 times occurrence within 20 minutes”. There is no emergency operation. The primary locations to verify are:

• Insufficient refrigerant
• Compressor

For the F98 error code (Total running current protection) on the PANASONIC CU-E10HBEA, the abnormality is judged by “3 times occurrence within 20 minutes”. There is no emergency operation. The primary locations to verify are:

• Excess refrigerant
• Improper heat radiation
• Outdoor PCB

For the F99 error code (Outdoor Direct Current (DC) peak detection) on the PANASONIC CU-E10HBEA, the abnormality is judged by “7 times occurrence continuously”. There is no emergency operation. The primary locations to verify are:

• Outdoor PCB
• IPM (Power transistor)
• Compressor

Troubleshooting steps for the H11 error on the PANASONIC CU-E10HBEA:

1. Check the indoor-outdoor units’ connection wires.
2. If there is any wiring error (YES): Correct the indoor-outdoor units connection wires.
3. If there is no wiring error (NO): Disconnect terminal 3 wire and measure Vdc between terminal 2 & 3 from the outdoor unit.
4. If the Vdc fluctuates between 20-70Vdc (YES): Replace outdoor PCB.
5. If the Vdc does not fluctuate between 20-70Vdc (NO): Reconnect terminal 3 wire and measure Vdc between terminal 2 & 3 from the outdoor unit.
6. If the Vdc fluctuates between 20-50Vdc (YES): Replace indoor unit PCB.

Caution: For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Troubleshooting steps for the H12 error on the PANASONIC CU-E10HBEA:

1. Check the indoor and outdoor unit connection wires.
2. If there is any wiring error (YES): Correct the indoor and outdoor units connection wires.
3. If there is no wiring error (NO): Check indoor and outdoor units model number.
4. If indoor unit and outdoor unit model numbers matched (YES): Check the spare part numbers of the indoor and outdoor unit PCBs and compare with their Part data.
5. If the model numbers did not match (NO): Match the compatible model(s).
6. If the spare part numbers matched (YES): The compatibility is confirmed.
7. If the spare part numbers did not match (NO): Change for the specified indoor or outdoor unit PCB, or Replace the indoor and outdoor unit PCBs.

Caution: For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Troubleshooting steps for the H14 error on the PANASONIC CU-E10HBEA:

1. Check the connector connection: Turn off the power, Check the connector connection.
2. If the connector connection is normal (YES): Check the indoor intake air temperature sensor: Plug out connector from the indoor unit PCB, Measure the resistance of the indoor intake air temperature sensor.
3. If the measured resistance of the indoor intake air temperature sensor matches the value specified in its characteristic chart (YES): The diagnosis is complete.
4. If the connector connection is not normal (NO): Connector poor contact, Correct the connection.
5. If the measured resistance of the indoor intake air temperature sensor does not match the value specified in its characteristic chart (NO): Defect in indoor intake air temperature sensor, Replace the indoor intake air temperature sensor, Defect in indoor unit PCB, Replace the indoor unit PCB.

Caution: For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Troubleshooting steps for the H15 error on the PANASONIC CU-E10HBEA:

1. Check the connector connection: Turn off the power, Check the connector connection.
2. If the connector connection is normal (YES): Check the outdoor compressor temperature sensor: Plug out connector from the outdoor unit PCB, Measure the resistance of the outdoor compressor temperature sensor.
3. If the measured resistance of the outdoor compressor temperature sensor matches the value specified in its characteristic chart (YES): The diagnosis is complete.
4. If the connector connection is not normal (NO): Connector poor contact, Correct the connection.
5. If the measured resistance of the outdoor compressor temperature sensor does not match the value specified in its characteristic chart (NO): Defect in outdoor compressor temperature sensor, Replace the outdoor compressor temperature sensor, Defect in outdoor unit PCB, Replace the outdoor unit PCB.

Caution: For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Troubleshooting steps for the H16 error on the PANASONIC CU-E10HBEA:

1. Operate normal heating operation. When H16 occurs again, turn OFF the power.
2. Check the 2/3 way valve.
3. If the 2/3 way valve is closed (YES): Open the 2/3 way valve.
4. If the 2/3 way valve is not closed (NO): Check for gas leakage.
5. If oil oozing out from the 2/3 way valve (YES): Repair the pipe flare or union nuts, Reclaim and recharge refrigerant.
6. If oil is not oozing out from the 2/3 way valve (NO): Turn ON the power and operate FORCE HEATING. Measure the current from the outdoor LIVE terminal.
7. If the current is < 1.0A (YES): Defect in CT, Replace the outdoor unit PCB.
8. If the current is not < 1.0A (NO): While the system is still in FORCE HEATING, check the discharge pressure.
9. If the pressure is unchanged (same as when compressor stops) (NO): Replace the outdoor unit PCB.
10. If the pressure is changed (YES): While the system is still in FORCE HEATING, further check (by touching): Compressor discharge pipe is cold, Compressor body is warm. To confirm the compressor low compression: Replace the compressor.

Caution: For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Troubleshooting steps for the H19 error on the PANASONIC CU-E10HBEA:

1. Turn off power supply and rotate fan by hand.
2. If the fan does not rotate smoothly (NO): Replace fan motor.
3. If the fan rotates smoothly (YES): Turn power supply on and operate fan.
4. If it does not rotate (NO): Turn off power supply and disconnect fan motor connector, then turn power on. Check the rotation feedback output from fan motor. If rotation feedback voltage 15VDC (pin 7 & 4) is generated (YES): Rotate the fan motor by hand, is the rotation feedback voltage 15VDC (pin 7 & 4) generated? If NO, Check the output of fan motor from indoor PCB. If is the motor power supply voltage ~325Vdc (pin 1 & 4) generated? (NO), If is the motor control voltage 15Vdc (pin 3 & 4) generated? (NO), Operate the fan, is the rotation command voltage 1-5Vdc (pin 2 & 4) generated? (NO): Replace indoor PCB. If YES: Replace fan motor.
5. If it rotates (YES): Stop fan motor.

Caution: For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Troubleshooting steps for the H23 error on the PANASONIC CU-E10HBEA:

1. Check the connector connection: Plug out connector from the indoor unit PCB, Measure the resistance of the indoor pipe temperature sensor.
2. If the connector connection is normal (YES): Check the outdoor air temperature sensor: Plug out connector from the outdoor unit PCB, Measure the resistance of the outdoor intake air temperature sensor.
3. If the measured resistance of the outdoor intake air temperature sensor matches the value specified in its characteristic chart (YES): The diagnosis is complete.
4. If the connector connection is not normal (NO): Connector poor contact, Correct the connection.
5. If the measured resistance of the outdoor intake air temperature sensor does not match the value specified in its characteristic chart (NO): Defect in outdoor intake air temperature sensor, Replace the outdoor intake air temperature sensor, Detect in outdoor unit PCB, Replace the outdoor unit PCB.

Caution: For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Troubleshooting steps for the H24 error on the PANASONIC CU-E10HBEA:

1. Check the connector connection: Plug out connector from the indoor unit PCB, Measure the resistance of the indoor pipe temperature sensor.
2. If the connector connection is normal (YES): Check the outdoor air temperature sensor: Plug out connector from the outdoor unit PCB, Measure the resistance of the outdoor intake air temperature sensor.
3. If the measured resistance of the outdoor intake air temperature sensor matches the value specified in its characteristic chart (YES): The diagnosis is complete.
4. If the connector connection is not normal (NO): Connector poor contact, Correct the connection.
5. If the measured resistance of the outdoor intake air temperature sensor does not match the value specified in its characteristic chart (NO): Defect in outdoor intake air temperature sensor, Replace the outdoor intake air temperature sensor, Detect in outdoor unit PCB, Replace the outdoor unit PCB.

Caution: For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Troubleshooting steps for the H27 error on the PANASONIC CU-E10HBEA:

1. Check the connector connection: Turn off the power, Check the connector connection.
2. If the connector connection is normal (YES): Check the outdoor air temperature sensor: Plug out connector from the outdoor unit PCB, Measure the resistance of the outdoor air temperature sensor.
3. If the measured resistance of the outdoor air temperature sensor matches the value specified in its characteristic chart (YES): The diagnosis is complete.
4. If the connector connection is not normal (NO): Connector poor contact, Correct the connection.
5. If the measured resistance of the outdoor air temperature sensor does not match the value specified in its characteristic chart (NO): Defect in outdoor air temperature sensor, Replace the outdoor air temperature sensor, Defect in outdoor unit PCB, Replace the outdoor unit PCB.

Caution: For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Troubleshooting steps for the H28 error on the PANASONIC CU-E10HBEA:

1. Check the connector connection: Turn off the power, Check the connector connection.
2. If the connector connection is normal (YES): Check the outdoor heat exchanger temperature sensor: Plug out connector from the outdoor unit PCB, Measure the resistance of the outdoor heat exchanger temperature sensor.
3. If the measured resistance of the outdoor heat exchanger temperature sensor matches the value specified in its characteristic chart (YES): The diagnosis is complete.
4. If the connector connection is not normal (NO): Connector poor contact, Correct the connection.
5. If the measured resistance of the outdoor heat exchanger temperature sensor does not match the value specified in its characteristic chart (NO): Defect in outdoor heat exchanger temperature sensor, Replace the outdoor heat exchanger temperature sensor, Defect in outdoor unit PCB, Replace the outdoor unit PCB.

Caution: For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Troubleshooting steps for the H30 error on the PANASONIC CU-E10HBEA:

1. Check the connector connection: Turn off the power, Check the connector connection.
2. If the connector connection is normal (YES): Check the outdoor discharge pipe temperature sensor: Plug out connector from the outdoor unit PCB, Measure the resistance of the outdoor discharge pipe temperature sensor.
3. If the measured resistance of the outdoor discharge pipe temperature sensor matches the value specified in its characteristic chart (YES): The diagnosis is complete.
4. If the connector connection is not normal (NO): Connector poor contact, Correct the connection.
5. If the measured resistance of the outdoor discharge pipe temperature sensor does not match the value specified in its characteristic chart (NO): Defect in outdoor discharge pipe temperature sensor, Replace the outdoor discharge pipe temperature sensor, Defect in outdoor unit PCB, Replace the outdoor unit PCB.

Caution: For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Troubleshooting steps for the H97 error on the PANASONIC CU-E10HBEA:

1. Turn off power supply and rotate fan by hand.
2. If the fan does not rotate smoothly (NO): Replace fan motor.
3. If the fan rotates smoothly (YES): Turn power supply on and operate fan.
4. If it does not rotate (NO): Turn off power supply and disconnect fan motor connector, then turn power on. Check the rotation feedback output from fan motor. If rotation feedback voltage 15VDC (pin 1 & 4) is generated (YES): If is the motor power supply voltage ~325Vdc (pin 1 & 4) generated? (NO). If is the motor control voltage 15Vdc (pin 3 & 4) generated? (NO). If Operate the fan, the rotation command voltage 1-5Vdc (pin 2 & 4) generated? (NO): Replace indoor PCB. If YES: Replace fan motor.
5. If it rotates (YES): Stop fan motor.

Caution: For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

The Malfunction Decision Conditions for H98 (Indoor High Pressure Protection) on the PANASONIC CU-E10HBEA are:

Error Code will not display (no Timer LED blinking) but store in EEPROM.

During heating operation, the temperature detected by the indoor pipe temperature sensor is above 60°C.

Troubleshooting steps for the H98 error on the PANASONIC CU-E10HBEA:

1. Check the air passage.
2. If there is any short circuit (YES): Provide sufficient air passage.
3. If there is no short circuit (NO): Check the indoor unit air filter.
4. If the air filter is dirty (YES): Clean the air filter.
5. If the air filter is not dirty (NO): Check the dust accumulation on the indoor unit heat exchanger.
6. If the indoor unit heat exchanger is dirty (YES): Clean the indoor unit heat exchanger.
7. If the indoor unit heat exchanger is not dirty (NO): Check the 2/3 way valve.
8. If the 2/3 way valve is closed (YES): Open the 2/3 way valve.
9. If the 2/3 way valve is not closed (NO): Check the indoor unit fan motor operation.
10. If the indoor unit fan motor operates normally (YES): Check refrigerant amount.
11. If the indoor unit fan motor does not operate normally (NO): Replace the indoor unit fan motor and/or indoor unit PCB.
12. If the refrigerant amount is filled correctly (YES): Check for clogged expansion valve or strainer.
13. If the refrigerant amount is not filled correctly (NO): Reclaim and recharge with correct amount of refrigerant.
14. If the expansion valve or strainer is clogged (ice formed) (YES): Replace the expansion valve and/or strainer, Reclaim and recharge refrigerant.
15. If the expansion valve or strainer is not clogged (ice formed) (NO): Check the indoor pipe temperature sensor.
16. If it does conform to the sensor characteristic chart (YES): Replace the indoor unit PCB.
17. If it does not conform to the sensor characteristic chart (NO): Replace the indoor pipe temperature sensor, Replace the indoor unit PCB.

Caution: For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

The Malfunction Decision Conditions for H99 (Indoor Freeze Prevention Protection: Cooling or Soft Dry) on the PANASONIC CU-E10HBEA are:

Error code will not display (no TIMER LED blinking) but store in EEPROM.

Freeze prevention control takes place (when indoor pipe temperature is lower than 2°C).

Troubleshooting steps for the H99 error on the PANASONIC CU-E10HBEA:

1. Check the air passage.
2. If there is any short circuit (YES): Provide sufficient air passage.
3. If there is no short circuit (NO): Check the indoor unit air filter.
4. If the air filter is dirty (YES): Clean the air filter.
5. If the air filter is not dirty (NO): Check the dust accumulation on the indoor unit heat exchanger.
6. If the indoor unit heat exchanger is dirty (YES): Clean the indoor unit heat exchanger.
7. If the indoor unit heat exchanger is not dirty (NO): Check the 2/3 way valve.
8. If the 2/3 way valve is closed (YES): Open the 2/3 way valve.
9. If the 2/3 way valve is not closed (NO): Check the indoor unit fan motor operation.
10. If the indoor unit fan motor operates normally (YES): Check for gas leakage.
11. If the indoor unit fan motor does not operate normally (NO): Replace the indoor unit fan motor and/or indoor unit PCB.
12. If there is gas leakage (YES): Repair the pipe flare or union nuts, Reclaim and recharge refrigerant.
13. If there is no gas leakage (NO): Check for clogged expansion valve or strainer.
14. If the expansion valve or strainer is clogged (ice formed) (YES): Repair the pipe flare or union nuts, Reclaim and recharge refrigerant.
15. If the expansion valve or strainer is not clogged (ice formed) (NO): Check the indoor pipe temperature sensor.
16. If it does conform to the sensor characteristic chart (YES): Replace the indoor unit PCB.
17. If it does not conform to the sensor characteristic chart (NO): Replace the indoor pipe temperature sensor, Replace the indoor unit PCB.

Caution: For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

The Malfunction Decision Conditions for F11 (4-way valve Abnormality) on the PANASONIC CU-E10HBEA are:

When heating operation, when indoor pipe temperature is below 10°C.

When cooling operation, when indoor pipe temperature is above 45°C.

Troubleshooting steps for the F11 error on the PANASONIC CU-E10HBEA:

1. Check the indoor pipe temperature sensor.
2. If it does not conform to the sensor characteristic chart (NO): Replace the indoor pipe temperature sensor.
3. If it conforms to the sensor characteristic chart (YES): Is the 4-way valve coil energized during cooling operation?
4. If the 4-way valve coil is energized (YES): Replace the outdoor unit PCB.
5. If the 4-way valve coil is not energized (NO): Check the 4-way valve coil for looseness.
6. If the 4-way valve coil is loose (YES): Correct the 4-way valve coil.
7. If the 4-way valve coil is not loose (NO): Check harness for outlet connector.
8. If harness is out of connector (YES): Reconnect the harness.
9. If harness is not out of connector (NO): Check the continuity of the 4-way valve coil.
10. If the harness is disconnected from the connector, resistance between harnesses about 180Ω (YES): Replace the 4-way valve coil.
11. If the harness is not disconnected from the connector (NO): Measure DC voltage supply to CN-HOT (pin1 & 2) during heating operation.
12. If the voltage supply to 4-way valve 2.5-4.5Vdc (YES): Replace the outdoor unit PCB.
13. If the voltage supply to 4-way valve is not 2.5-4.5Vdc (NO): Replace the 4-way valve.

Caution: For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

The Malfunction Decision Conditions for F90 (Power Factor Correction Protection) on the PANASONIC CU-E10HBEA are:

During startup and operation of cooling and heating, when Power Factor Correction (PFC) protection circuitry at the outdoor unit main PCB senses abnormal high DC voltage level.

Troubleshooting steps for the F90 error on the PANASONIC CU-E10HBEA:

1. Check the supply voltage.
2. If supply voltage is as specified (YES): Operate the system. Verify PFC abnormality by measuring DC voltage between P(+) and N(-) terminal at the outdoor unit PCB.
3. If the DC voltage between P(+) and N(-) terminal is normal between 285-315Vdc (YES): Check the compressor winding resistance. Turn off the power supply and reconnect the harness U, V and W. Measure the winding resistance between U-V, V-W and W-U.
4. If the compressor’s winding resistance (U-V, V-W, W-U) are uniform (YES): Replace the outdoor unit PCB.
5. If the supply voltage is not as specified (NO): Correct the power supply.
6. If the DC voltage is not normal between 285-315Vdc (NO): Defect in PFC circuitry, Replace the outdoor unit PCB.
7. If the compressor’s winding resistance (U-V, V-W, W-U) are not uniform (NO): Replace the compressor.

Caution: For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

The Malfunction Decision Conditions for F91 (Refrigeration Cycle Abnormality) on the PANASONIC CU-E10HBEA are:

During cooling, compressor frequency = Fcmax.

During heating, compressor frequency > Fhrated.

During cooling and heating operation, running current: 0.65A < I < 1.65A.

During cooling, indoor intake – indoor pipe < 4°C.

During heating, indoor pipe – indoor intake < 5°C.

Multi Models Only:

Gas shortage detection 1: A gas shortage is detected by checking the CT-detected input current value and the compressor running frequency. During startup and operating of cooling and heating, input current < 8.78/256 (A/Hz) × compressor running frequency + 0.25.

Gas shortage detection 2: A gas shortage is detected by checking the difference between indoor pipe temperature and indoor intake air temperature during cooling and heating.

Troubleshooting steps for the F91 error on the PANASONIC CU-E10HBEA:

1. Check the indoor air intake and pipe temperature sensors.
2. If it does conform to the sensor characteristic chart (YES): Check 2/3-way valve opened?
3. If 2/3-way valve is opened (YES): Check for gas leaking.
4. If oil oozing out from the 2/3 way valve (YES): Repair the pipe flare or union nuts, Reclaim and recharge refrigerant.
5. If oil is not oozing out from the 2/3 way valve (NO): Check for clogged expansion valve or strainer.
6. If the capillary tube or dryer is clogged (ice formed)? (YES): Replace the capillary tube or dryer, Reclaim and recharge refrigerant.
7. If the capillary tube or dryer is not clogged (ice formed)? (NO): Charge for a specified amount of fresh refrigerant.
8. If the refrigeration cycle abnormality error again? (YES): Replace outdoor unit PCB & compressor.
9. If the refrigeration cycle abnormality error again? (NO): Procedure complete.
10. If it does not conform to the sensor characteristic chart (NO): Replace the indoor air intake or pipe temperature sensor.
11. If 2/3-way valve is not opened (NO): Open 2/3 way valve.

Caution: For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Troubleshooting steps for the F93 error on the PANASONIC CU-E10HBEA:

1. Check the U, V and W connector connection: Turn OFF the power, check the U, V and W connection at outdoor unit PCB and compressor terminal.
2. If the connector connection is normal (YES): Disconnect the harnesses U, V and W from the compressor terminal.
3. If the 6 LEDs are blinking in the same sequence/condition (YES): Replace compressor.
4. If the connector connection is not normal (NO): Correct the connection.
5. If the 6 LEDs are not blinking in the same sequence/condition (NO): IPM defective, Replace outdoor unit PCB.

From the disconnected harness, Turn ON the power and operate the inverter checker. If the 6 LEDs blink in the same sequence/condition, the issue is related to the compressor. If the 6 LEDs do not blink in the same sequence/condition, the issue is related to the Outdoor PCB.

Caution: For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Troubleshooting steps for the F95 error on the PANASONIC CU-E10HBEA:

1. Check the outdoor air passage.
2. If there is any short circuit (YES): Provide sufficient air passage.
3. If there is no short circuit (NO): Check the dust accumulation on the outdoor unit heat exchanger.
4. If the outdoor unit heat exchanger is dirty (YES): Clean the outdoor heat exchanger.
5. If the outdoor unit heat exchanger is not dirty (NO): Check the 2/3 way valve.
6. If the 2/3 way valve is closed (YES): Open the 2/3 way valve.
7. If the 2/3 way valve is not closed (NO): Check the outdoor unit fan motor operation.
8. If the fan motor operates normally (YES): Check refrigerant amount.
9. If the fan motor does not operate normally (NO): Replace the outdoor unit fan motor and/or outdoor PCB.
10. If the additional refrigerant amount filled correctly (YES): Check for clogged expansion valve or strainer.
11. If the additional refrigerant amount filled correctly (NO): Reclaim and recharge with correct amount of refrigerant.
12. If the expansion valve or strainer is clogged (ice formed)? (YES): Replace the outdoor fan motor.
13. If the expansion valve or strainer is not clogged (ice formed)? (NO): Check the outdoor pipe temperature sensor.
14. If it does conform to the sensor characteristic charts (YES): Replace outdoor unit PCB.
15. If it does not conform to the sensor characteristic charts (NO): Replace the outdoor pipe temperature sensor, Replace outdoor unit PCB.

Caution: For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Troubleshooting steps for the F96 error on the PANASONIC CU-E10HBEA:

1. Check the outdoor unit installation environment during cooling or soft dry operation.
2. If there is any improper heat radiation (YES): Reinstall the outdoor unit, Remove the obstacle(s), Clean the outdoor heat exchanger.
3. If there is no improper heat radiation (NO): Is outdoor fan motor operating?
4. If outdoor fan motor is operating (YES): Defect in IPM, Replace the outdoor unit PCB.
5. If outdoor fan motor is not operating (NO): Replace the outdoor fan motor.

Caution: For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Troubleshooting steps for the F97 error on the PANASONIC CU-E10HBEA:

1. Check the compressor tank temperature sensor.
2. If it does conform to the sensor characteristic chart (YES): Check 2/3 way valve closed?
3. If 2/3 way valve is closed (YES): Open the 2/3 way valve.
4. If 2/3 way valve is not closed (NO): Check for gas leakage.
5. If oil oozing out from the 2/3 way valve (YES): Repair the pipe flare or union nuts, Reclaim and recharge refrigerant.
6. If oil is not oozing out from the 2/3 way valve (NO): Check for clogged expansion valve or dryer.
7. If the capillary tube or dryer is clogged (ice formed)? (YES): Replace the capillary tube or dryer.
8. If the capillary tube or dryer is not clogged (ice formed)? (NO): Charge for a specified amount of fresh refrigerant.
9. If refrigeration cycle abnormality error again? (YES): Replace outdoor unit PCB, Replace outdoor unit compressor.
10. If refrigeration cycle abnormality error again? (NO): Procedure complete.
11. If it does not conform to the sensor characteristic chart (NO): Replace the compressor tank temperature sensor.

Caution: For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Troubleshooting steps for the F98 error on the PANASONIC CU-E10HBEA:

1. Get restarted and measure the input current.
2. If Input current > 15.06A? (YES): Turn off power supply. Check the main circuit electrolytic capacitor.
3. If Normal? (YES): Repair the pipe flare or union nuts, Reclaim and recharge refrigerant.
4. If not Normal? (NO): Check refrigerant amount.
5. If Excess refrigerant? (YES): Replace outdoor unit PCB, Replace outdoor unit compressor.
6. If there is no excess refrigerant? (NO): Replace the outdoor unit PCB.
7. If Input current is not > 15.06A? (NO): Replace the outdoor unit PCB.

Caution: For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Troubleshooting steps for the F99 error on the PANASONIC CU-E10HBEA:

1. Get restarted and measure the input current.
2. If Input current > 20.2A? (YES): Check the compressor winding resistance. Turn off the power and disconnect the harness U, V and W. Measure the winding resistance between U-V, V-W and W-U.
3. If Are the compressor’s winding resistance (U-V, V-W or W-U) uniform? (YES): Compressor defective due to winding shorted, Replace compressor.
4. If the compressor’s winding resistance (U-V, V-W or W-U) are not uniform? (NO): Outdoor electronic circuit defect due to power transistor, Replace the outdoor unit PCB.
5. If Input current is not > 20.2A? (NO): Replace the outdoor unit PCB.

Before checking the power transistor, never touch any live parts for at least 10 minutes after turning off the circuit breaker. If unavoidable necessary to touch a live part, make sure the power transistor’s supply voltage is below 50V using the tester. For the UVW, make measurement at the Faston terminal on the board of the relay connector.

Caution: For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.