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What are the functions of the operation buttons on the wired remote controller for the MITSUBISHI ELECTRIC PEA-A12AA6?
Once the controls are set, the same operation mode can be repeated by simply pressing the ON/OFF button. The functions of the operation buttons are as follows:
Set Temperature buttons:
• ▽ Down: Lowers the temperature setting.
• △ Up: Raises the temperature setting.
Timer Menu button (Monitor/Set button): Accesses the timer menu for monitoring and setting.
Mode button (Return button): Selects the operation mode (e.g., Cool, Heat, Fan) and acts as a return button.
Set Time buttons:
• ◁ Back: Moves back in time settings.
• ▷ Ahead: Moves forward in time settings.
Timer On/Off button (Set Day button): Turns the timer on or off and sets the day for weekly timers.
Start/Stop button: Turns the unit on or off.
Fan Speed button: Adjusts the fan speed.
Filter button (<return sign> button): Resets the filter indicator after cleaning.
Test Run button: Initiates a test run operation.
Service button (Clear button): Used for service and maintenance purposes, such as clearing errors.
Airflow Up/Down button: Adjusts the vertical direction of the airflow.
Louver button (◁ Operation button): Controls the louver operation. The ◁ arrow moves to the preceding operation number.
Ventilation button (▷ Operation button): Controls the ventilation unit. The ▷ arrow moves to the next operation number.
What do the various indicators on the remote controller display of the MITSUBISHI ELECTRIC PEA-A12AA6 mean?
The display on the wired remote controller shows the following information:
• “Sensor” indication: Displayed when the remote controller sensor is used.
• Day-of-Week: Shows the current day of the week.
• Time/Timer Display: Shows the current time (12-hour or 24-hour clock). If the simple or Auto Off timer is set, it shows the remaining time.
• “Locked” indicator: Indicates that the remote controller buttons have been locked.
• “Clean The Filter” indicator: Comes on when it is time to clean the filter.
• Timer indicators: Comes on if the corresponding timer (WEEKLY, SIMPLE, AUTO OFF) is set.
• Fan Speed indicator: Shows the selected fan speed.
• Ventilation indicator: Appears when the unit is running in Ventilation mode.
• (Power On indicator): Indicates that the power is on.
• Louver display: Indicates the action of the swing louver. Does not appear if the louver is stationary.
• Room Temperature display: Shows the current room temperature.
• Up/Down Air Direction indicator: The indicator shows the direction of the outcoming airflow.
• “One Hour Only” indicator: Displayed if the airflow is set to Low and downward during COOL or DRY mode. The indicator goes off after one hour, at which time the airflow direction also changes.
• “Timer Is Off” indicator: Indicates that the timer is off.
• Temperature Setting: Shows the target temperature.
• “Centrally Controlled” indicator: Indicates that operation of the remote controller has been prohibited by a master controller.
• Identifies the current operation: Shows the operating mode, etc. Multilanguage display is supported.
Caution:
• Only the Power on indicator lights when the unit is stopped and power is supplied to the unit.
• If you press a button for a feature that is not installed in the indoor unit, the remote controller will display the “Not Available” message.
• When power is turned ON for the first time, it is normal that “PLEASE WAIT” is displayed on the room temperature indication for a maximum of 2 minutes. Please wait until this “PLEASE WAIT” indication disappears then start the operation.
What are the specifications for the MITSUBISHI ELECTRIC PEA-A12AA6?
Note:
1. Cooling/Heating capacity indicates the maximum value at operation under the following condition.
<Cooling> Indoor: 80°FD.B. / 67°FW.B. (26.7°CD.B. / 19.4°CW.B.) Outdoor:95°FD.B. (35°CD.B.)
<Heating> Indoor:70°FD.B. (21.1°CD.B.) Outdoor:47°FD.B. / 43°FW.B. (8.3°CD.B. / 6.1°CW.B.)
Pipe length: 24-9/16ft (7.5m) Height difference: Oft (0m)
2. Power consumption. Run current at 0.060[in.WG] (15Pa) (external static pressure).
3. Cooling capacity value at 1:1 system.
Heating capacity value at 1:1 system.
How is the field-installed heater controlled on the MITSUBISHI ELECTRIC PEA-A12AA6?
The field-installed heater is controlled based on function settings. Select the desired pattern from the table below and set the function on the indoor unit. Refer to the Installation Manual for function settings.
Table 1: [Function table]| Mode | Setting | Mode no. | Setting | Initial setting |
|---|---|---|---|---|
| Heater control |
Heater OFF: Inlet air temp. ≥ set temp.
Heater ON: Inlet air temp. < set temp.-4.5°F(2.5°C) • The fan will stop and the heater will turn off when [DEFROST] or [ERROR] is displayed. Heater output is ON when inlet air temp is below “set temp.-1.8°F(1°C)” and OFF when above “set temp.”. |
23 | 1 | ○ |
|
Heater OFF: Inlet air temp. ≥ set temp.
Heater ON: Inlet air temp. < set temp.-4.5°F(2.5°C) • The fan will drive and the heater will turn on when [DEFROST] or [ERROR] is displayed. Heater output is ON when inlet air temp is below “set temp.-4.5°F(2.5°C)” and OFF when above “set temp.”. |
23 | 2 | – |
How is the fan controlled when using a heater with the MITSUBISHI ELECTRIC PEA-A12AA6?
By setting the Mode No. 23 in the Function Table and using the optional parts PAC-YU25HT, the fan control will operate as follows when [DEFROST] or [ERROR] is displayed.
Fan control patterns when [DEFROST] or [ERROR] is displayed
| Use of CN4Y (PAC-YU25HT) | Heater is installed in the duct. | No heater is installed in the duct. |
|---|---|---|
| Heater is off. | Unused* | Used |
| Heater is on. | Fan ON*1 | Fan OFF |
* If a heater is installed in the duct, do not use CN4Y. By doing so, the fan will turn off when the heater is on, which may result in fire.
*1 Fan speed setting
| Mode | Setting | Mode no. | Setting | Initial setting | |
|---|---|---|---|---|---|
| Fan control | Heating Thermo-OFF | [DEFROST] or [ERROR] | |||
| Very low | Very low | 25 | 1 | ○ | |
| STOP | Remote controller setting | 25 | 2 | – | |
| Remote controller setting | Remote controller setting | 25 | 3 | – | |
What are the main cautions to observe when troubleshooting the MITSUBISHI ELECTRIC PEA-A12AA6?
(1) Before troubleshooting, check the followings:
• Check the power supply voltage.
• Check the indoor/outdoor connecting wire for mis-wiring.
(2) Take care the followings during servicing:
• Before servicing the air conditioner, be sure to turn off the remote controller first to stop the main unit, and then turn off the breaker.
• When removing the indoor controller board, hold the edge of the board with care NOT to apply stress on the components.
• When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
How do I use the self-check function and what do the error codes mean for the MITSUBISHI ELECTRIC PEA-A12AA6?
To use the self-check function on the wired remote controller:
1. Turn on the power.
2. Press the [CHECK] button twice.
3. Set refrigerant address with the [TEMP] button if system control is used.
4. Press the [ON/OFF] button to stop the self-check.
The following table describes the check codes displayed on the LCD:
| Check code | Symptom | Remark |
|---|---|---|
| P1 | Intake sensor error | For details, check the LED display of the outdoor controller board. As for outdoor unit, refer to service manual OC322. |
| P2 | Pipe (TH2) sensor error | |
| P9 | Pipe (TH5) sensor error | |
| E6, E7 | Indoor/outdoor unit communication error | |
| P4 | Drain sensor error | |
| P5 | Drain pump error | |
| P6 | Freezing/Overheating protection operation | |
| EE | Communication error between indoor and outdoor units | |
| P8 | Pipe temperature error | |
| E0, E3~E5 | Remote controller transmission error | |
| E1, E2 | Remote controller control board error | |
| Fb | Indoor unit control system error (memory error, etc.) | |
| E9 | Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit) | |
| UP | Compressor overcurrent interruption | |
| U3, U4 | Open/short of outdoor unit thermistors | |
| UF | Compressor overcurrent interruption (When compressor locked) | |
| U2 | Abnormal high discharging temperature/49C worked/insufficient refrigerant | |
| U1, Ud | Abnormal high pressure (63H worked)/Overheating protection operation | |
| U5 | Abnormal temperature of heat sink | |
| U8 | Outdoor unit fan safeguard stop | |
| U6 | Compressor overcurrent interruption/Abnormal of power module | |
| U7 | Abnormality of super heat due to low discharge temperature | |
| U9, UH | Abnormality such as overvoltage or voltage shortage and abnormal synchronous signal to main circuit /Current sensor error | |
| Others | Other errors (Refer to the technical manual for the outdoor unit.) |
What do the initial display messages and LED indicators mean during troubleshooting of the MITSUBISHI ELECTRIC PEA-A12AA6?
If the unit cannot be operated properly after a test run, refer to the following tables.
Initial Operation Symptoms:| Symptom | Cause | |
|---|---|---|
| Wired remote controller | LED 1, 2 (PCB in outdoor unit) | |
| PLEASE WAIT (For about 2 minutes after power-on) | After LED 1, 2 are lighted, LED 2 is turned off, then only LED 1 is lighted. (Correct operation) | For about 2 minutes after power-on, operation of the remote controller is not possible due to system start-up. (Correct operation) |
| PLEASE WAIT → Error code (After about 2 minutes has expired after power-on) | Only LED 1 is lighted. → LED 1, 2 blink. | • Connector for the outdoor unit’s protection device is not connected. • Reverse or open phase wiring for the outdoor unit’s power terminal block (L1, L2, L3) |
| Display messages do not appear even when operation switch is turned ON (operation lamp does not light up). | Only LED 1 is lighted. → LED 1 blinks twice, LED 2 blinks once. | • Incorrect wiring between indoor and outdoor units (incorrect polarity of S1, S2, S3) • Remote controller wire short |
Note: Operation is not possible for about 30 seconds after cancellation of function selection. (Correct operation)
Indoor Controller LED Descriptions:| LED | Description |
|---|---|
| LED1 (power for microcomputer) | Indicates whether control power is supplied. Make sure that this LED is always lit. |
| LED2 (power for remote controller) | Indicates whether power is supplied to the remote controller. This LED lights only in the case of the indoor unit which is connected to the outdoor unit refrigerant address “0”. |
| LED3 (communication between indoor and outdoor units) | Indicates state of communication between the indoor and outdoor units. Make sure that this LED is always blinking. |
How does the AUTO RESTART FUNCTION work on the MITSUBISHI ELECTRIC PEA-A12AA6?
The MITSUBISHI ELECTRIC PEA-A12AA6 is equipped with an AUTO RESTART FUNCTION. When the indoor unit is controlled with the remote controller, the operation mode, set temperature, and fan speed are memorized by the indoor controller board. The auto restart function activates the moment power is restored after a power failure. The unit will then automatically restart with the previously memorized settings. You can set the AUTO RESTART FUNCTION using the wireless remote controller (Mode no. 1).
How do I troubleshoot specific error codes (P1, P2, P4, P5) on the MITSUBISHI ELECTRIC PEA-A12AA6?
| Error Code | Abnormal point and detection method | Cause | Countermeasure |
|---|---|---|---|
| P1 | Room temperature thermistor (TH1) • Detected if short/open of thermistor occurs. • Short: 90°C [194°F] or more • Open: -40°C[-40°F] or less |
① Defective thermistor characteristics ② Contact failure of connector (CN20) ③ Breaking of wire or contact failure ④ Defective indoor controller board |
①-③ Check resistance value of thermistor (e.g., 15.0kΩ at 0°C, 6.3kΩ at 20°C). Check connector (CN20) contact. ④ Check room temperature display on remote controller. Replace indoor controller board if there is abnormal difference with actual room temperature. |
| P2 | Pipe temperature thermistor/Liquid (TH2) • Detected if short/open of thermistor occurs. • Short: 90°C[194°F] or more • Open: -40°C[-40°F] or less |
① Defective thermistor characteristics ② Contact failure of connector (CN44) ③ Breaking of wire or contact failure ④ Defective refrigerant circuit ⑤ Defective indoor controller board |
①-③ Check resistance value of thermistor and contact failure of connector (CN44). ④ Check pipe <liquid> temperature in test run mode. If extremely low (cooling) or high (heating), refrigerant circuit may be defective. ⑤ Replace indoor controller board if there is an extreme difference with actual pipe temperature. |
| P4 (5701) | Contact failure of drain float switch (CN4F) • Detected when the connector of the drain float switch is disconnected and not short-circuited. |
① Contact failure of connector (Insert failure) ② Defective indoor controller board |
① Check contact failure of float switch connector. Turn the power on again after inserting. ② Operate with connector (CN4F) short-circuited. Replace indoor controller board if abnormality reappears. |
| P5 | Drain overflow protection operation • Suspensive abnormality, if drain float switch is detected to be underwater for 1 minute and 30 seconds continuously with drain pump on. |
① Malfunction of drain pump ② Clogged drain pump/pipe ③ Defective drain float switch ④ Defective indoor-controller board |
① Check if drain-up machine works. ② Check drain function. ③ Remove connector CN4F and check if it is short (ON) with moving part UP, or OPEN with moving part down. Replace float switch if faulty. ④ Replace indoor controller board if it is short-circuited between pins of the drain float switch connector and abnormality reappears. |
How do I troubleshoot error codes P6 and P8 (Freezing/Overheating Protection, Pipe Temperature) on the MITSUBISHI ELECTRIC PEA-A12AA6?
| Error Code | Abnormal point and detection method | Cause | Countermeasure |
|---|---|---|---|
| P6 | Freezing protection (Cooling mode) Pipe temp stays under -15°C[5°F] for three minutes. |
(Cooling/Drying) ① Clogged filter (reduced airflow) ② Short cycle of air path ③ Low-load operation ④ Defective indoor fan motor ⑤ Defective outdoor fan control ⑥ Overcharge of refrigerant ⑦ Defective refrigerant circuit |
(Cooling/Drying) ① Check clogging of the filter. ② Remove shields. ④ Refer to 7-7. DC Fan motor check. ⑤ Check outdoor fan motor. ⑥-⑦ Check operating condition of refrigerant circuit. |
| Overheating protection (Heating mode) Pipe temp is over 70°C [158°F]. |
(Heating) ① Clogged filter (reduced airflow) ② Short cycle of air path ③ Over-load operation ④ Defective indoor fan motor ⑤ Defective outdoor fan control ⑥ Overcharge of refrigerant ⑦ Defective refrigerant circuit ⑧ Bypass circuit of outdoor unit is defective. |
(Heating) ① Check clogs of the filter. ② Remove shields. ④ Refer to 7-7. DC Fan motor check. ⑤ Check outdoor fan motor. ⑥-⑧ Check operating condition of refrigerant circuit. |
|
| P8 | Pipe temperature <Cooling mode> Temp difference between TH1 and (TH2/TH5) is not in range. <Heating mode> Condenser/evaporator pipe temp is not in heating range. |
① Slight temperature difference (shortage of refrigerant, disconnected thermistor, defective circuit) ② Converse connection of extension pipe (plural units) ③ Converse wiring of indoor/outdoor unit ④ Defective temp thermistor ⑤ Stop valve is not opened completely. |
①-④ Check pipe temperature with remote controller display. Check for converse connection of pipes or wiring. ⑤ Check stop valve. |
How do I troubleshoot error codes P9, E0, E4, E3, and E5 on the MITSUBISHI ELECTRIC PEA-A12AA6?
| Error Code | Abnormal point and detection method | Cause | Countermeasure |
|---|---|---|---|
| P9 | Abnormality of pipe temperature thermistor / Condenser-Evaporator (TH5) Detected on short/open. Short: 90°C[194°F] or more Open: -40°C[-40°F] or less |
① Defective thermistor ② Contact failure of connector (CN44) ③ Breaking of wire ④ Defective refrigerant circuit ⑤ Defective indoor controller board |
①-③ Check thermistor resistance and connector CN44. ④ Operate in test run mode and check pipe temperature. If extreme, circuit may be defective. ⑤ If no other problems found, replace indoor unit control board. |
| E0 or E4 | Remote controller transmission error(E0)/signal receiving error(E4) Communication failure between remote controller and indoor unit. |
① Contact failure at transmission wire ② All remotes set as “sub” ③ Mis-wiring of remote controller ④ Defective remote controller circuit ⑤ Defective indoor board circuit ⑥ Noise in transmission wire |
① Check disconnection/looseness of wire. ② Set one remote controller to “main”. ③ Check wiring. ④-⑤ Diagnose remote controllers. Replace faulty component (remote or indoor board). ⑥ Check for sources of noise. |
| E3 or E5 | Remote controller transmission error(E3)/signal receiving error(E5) Remote controller cannot find a blank transmission path or receives conflicting data. |
① Two remotes set as “main” ② Remote connected to two or more units ③ Repetition of refrigerant address ④ Defective remote controller circuit ⑤ Defective indoor board circuit ⑥ Noise in transmission wire |
① Set one remote to “main”, the other to “sub”. ② Connect remote to only one indoor unit. ③ Set a separate address. ④-⑤ Diagnose remote controller. Replace faulty component. ⑥ Check for sources of noise. |
What should I do if the LED2 on the indoor controller board of my MITSUBISHI ELECTRIC PEA-A12AA6 is off or blinking?
If you are experiencing issues where the LED2 on the indoor controller board is off or blinking, follow these troubleshooting steps:
(1) LED2 on indoor controller board is off.
| Cause | Countermeasure |
|---|---|
| • When LED1 is also off: Power supply of rated voltage is not supplied to outdoor unit. | ① Check the voltage of outdoor power supply terminal block. If AC 208~230V is not detected, check power wiring and breaker. If voltage is detected, proceed to check ②. |
| • Defective outdoor controller circuit board. | ② Check voltage between outdoor terminal block S1 and S2. If AC 208~230V is not detected, check the fuse on outdoor controller circuit board and wiring connection. If voltage is detected, proceed to check ③. |
| • Power supply of 208~230V is not supplied to indoor unit. | ③ Check the voltage between indoor terminal block S1 and S2. If not detected, check indoor/outdoor unit connecting wire for mis-wiring. If voltage is detected, proceed to check ④. |
| • Defective indoor controller board. | ④ Check the fuse on the indoor controller board and the wiring connection. If no problems are found, the indoor controller board is defective. |
(2) LED2 on indoor controller board is blinking.
| Cause | Countermeasure |
|---|---|
| • When LED1 is also blinking: Connection failure of indoor/outdoor unit connecting wire. | Check indoor/outdoor unit connecting wire for connection failure. |
| • When LED1 is lit: Mis-wiring of remote controller wires. Under twin/triple system, 2 or more indoor units are wired together. | ① Check the connection of remote controller wires. When 2 or more indoor units are in one system, connect remote controller wires to only one of those units. |
| • Refrigerant address for outdoor unit is wrong or not set. Under grouping control, there are some units whose refrigerant address is 0. | ② Check the setting of refrigerant address. If multiple units in a group have address 0, set only one of them to 0 using SW1 (3-6) on the outdoor controller circuit board. |
| • Short-cut of remote controller wires or defective remote controller. | ③④ Remove remote controller wires and check LED2. If LED2 is still blinking, check for a short-cut in the wires. If LED2 is lit, reconnect wires; if it blinks again, the remote controller is defective. If it stays lit, the connection was faulty. |
How do I test the thermistors on the MITSUBISHI ELECTRIC PEA-A12AA6?
To check the thermistors (TH1, TH2, TH5), follow this procedure:
| Part name | Check method and criterion | ||||
|---|---|---|---|---|---|
| Room temperature thermistor (TH1) Pipe temperature thermistor/liquid (TH2) Condenser/evaporator temperature thermistor (TH5) |
Measure the resistance with a tester.
|
What is the procedure for checking the DC fan motor on the MITSUBISHI ELECTRIC PEA-A12AA6?
Notes:
• High voltage is applied to the connector (CNMF) for the fan motor. Give attention to the service.
• Do not pull out the connector (CNMF) for the motor with the power supply on, as it can cause trouble for the indoor controller circuit board and fan motor.
Self-check procedure for when the indoor fan cannot turn around:
1. Check the fuse (FUSE) on the indoor controller board.
2. Did the fuse blow?
• If YES: Check the drain pump (DP). If the resistance is not normal, replace the drain pump (DP). If the resistance is normal, replace the indoor controller board (I.B.) and the fan motor (MF).
• If NO: Proceed to step 3.
3. Check the wiring contact of the fan motor connector (CNMF).
4. Is there a contact failure?
• If YES: Perform a wiring recovery.
• If NO: Proceed to step 5.
5. Perform a power supply check. Remove the connector (CNMF) and measure the voltage on the indoor controller circuit board.
• TEST POINT ①: VDC between 1 (+) and 4 (-) of the fan connector should be DC294~340V.
• TEST POINT ②: Vcc between 5 (+) and 4 (-) of the fan connector should be DC15V.
6. Is the voltage normal?
• If NO: Replace the indoor controller board.
• If YES: Replace the fan motor. Check the operation of the fan. If it’s still not working (NG), replace the indoor controller board. If it is OK, the procedure is complete. If you check the operation and it is NG, replace the fan motor.
How do I disassemble the control box and thermistor on the MITSUBISHI ELECTRIC PEA-A12AA6?
Exercise caution when removing heavy parts.
1. Control box
1. Removing the control box cover
(1) Remove the two fixing screws on the cover (A) to remove it.
2. Thermistor (Intake air)
1. Remove the control box cover according to the procedure in section [1].
2. (1) Pull out the thermistor holder (B) and thermistor (C) on the control box.
How do I remove the drainpan of the MITSUBISHI ELECTRIC PEA-A12AA6?
Exercise caution when removing heavy parts.
Note: Drain the water out of the drain pan before removing it. To avoid dew condensation, use insulated screws in the places marked with circles.
1. Removing the filter and the bottom plate
(1) Push up the tab on the filter, and pull out the filter in the direction of the arrow.
(2) Remove the fixing screws on the bottom plate (D), (E) to remove it.
2. Removing the drainpan
(1) Pull out the drain pan in the direction of the arrow.
How do I remove the Condenser/Evaporator (Liquid pipe) thermistor on the MITSUBISHI ELECTRIC PEA-A12AA6?
Exercise caution when removing heavy parts.
1. Remove the drain pan according to the procedure in section [3].
2. Removing the Heat exchanger cover:
(1) Remove the four fixing screws on the heat exchanger cover (F) to remove it.
3. Removing the thermistor:
(1) Remove the thermistor (G) from the thermistor holder (H) on the copper tube.
Thermistor size:
• Liquid pipe: ø3/8inch(ø8mm)
• Condenser / evaporator: ø1/4inch(ø6mm)
What is the disassembly procedure for the fan and fan motor of the MITSUBISHI ELECTRIC PEA-A12AA6?
Exercise caution when removing heavy parts.
1. Removing the filter and the bottom plate
(1) Push down the tab on the filter, and pull out the filter in the direction of the arrow 1.
(2) Remove the fixing screws on the bottom plate (J) to remove it.
2. Removing the fan casing (bottom half)
(1) Squeeze the tabs on the fan casing to remove it in the direction of arrow 2.
3. Removing the motor cable
(1) Remove the motor cable through the rubber bush.
4. Removing the fan motor and the Sirocco fan
(1) Remove the two motor fixing screws to remove the motor and the Sirocco fan in the direction of arrow 3.
(2) Remove the four fan case fixing screws to take the top half of the fan casing off.
How do I remove the bearing and heat exchanger on the MITSUBISHI ELECTRIC PEA-A12AA6?
Exercise caution when removing heavy parts.
6. Bearing [PEA-A18AA(4), (6) model only]
1. Removing the bearing:
(1) Remove the two fixing screws on the bearing cover (K) to remove it.
(2) Remove the two bearing retainer screws to remove the bearing.
7. Heat exchanger
1. Remove the drain pan according to the procedure in section [3].
2. Remove the heat exchanger cover according to the procedure in section [4] 2.
3. Removing the cover:
(1) Remove the two fixing screws on the cover (L) to remove it.
4. Removing the Heat exchanger:
(1) Remove the fixing screws on the heat exchanger (M) to remove it.
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