List of error codes for the Mitsubishi Yack Modul’o air-to-water heat pump
List of indoor unit error codes – Mitsubishi Yack Modul’o
Download the MITSUBISHI YACK MODUL’O manual
Indoor unit error codes
| Error code on
remote control |
LED on indoor unit | LED on outdoor unit | Cause | ||
| green | red | green | red | ||
|
No indication |
flashes continuously | off | flashes continuously | off | Normal operation |
| off | off | off | off | System powered off, phase (L) cable not
connected, power outage |
|
| flashes continuously | 3 flashes | flashes continuously | off | Remote control wiring fault,
wires swapped between terminals X, Y and Z |
|
| ✊WAIT✊ | flashes continuously | off | flashes continuously | 2 flashes | Cables disconnected or poor connection
between indoor/outdoor units |
|
E1 |
flashes continuously |
off |
flashes continuously |
off |
Remote control wiring fault or when several remote controls are used, no power to some indoor
units |
| flashes continuously | off | flashes continuously | off | Communication fault on indoor unit | |
|
E5 |
flashes continuously | 2 flashes | flashes continuously | off | Transmission error between indoor unit and
outdoor unit |
| flashes continuously | 2 flashes | off or flashes
continuously |
off | Communication fault on outdoor unit | |
| E6 | flashes continuously | 1 flash | flashes continuously | off | Fault in the indoor unit’s heat exchanger
thermistor |
| E7 | flashes continuously | 1 flash | flashes continuously | off | Fault in the indoor unit’s return air
thermistor |
|
E8 |
flashes continuously |
1 flash |
flashes continuously |
off |
Heating overload (the temperature on the indoor heat exchanger is too high) or the indoor heat exchanger thermistor is
faulty. |
| E28 | flashes continuously | off | flashes continuously | off | Fault in the remote control’s remote room
temperature thermistor |
Outdoor unit error code
| Error code on remote control | LED on indoor unit | LED on outdoor unit |
Cause |
||
| green | red | green | red | ||
| E32 | flashes continuously | off | flashes continuously | 1 flash | Phase reversal or phase not connected |
| E34 | flashes continuously | off | flashes continuously | 1 flash | Outdoor unit PCB power supply fault |
| E35 | flashes continuously | off | flashes continuously | 1 flash | The temperature on the outdoor heat exchanger is too high or the heat exchanger thermistor is faulty |
| E36 | flashes continuously | off | flashes continuously | 1 flash | Abnormal discharge temperature |
| E37 | flashes continuously | off | flashes continuously | 1 flash | Fault in the outdoor unit’s heat exchanger thermistor |
| E38 | flashes continuously | off | flashes continuously | 1 flash | Outdoor air thermistor fault |
| E39 | flashes continuously | off | flashes continuously | 1 flash | Discharge thermistor fault |
| E40 | flashes continuously | off | flashes continuously | 1 flash | HP fault (63H1 pressure switch tripped) |
| E41 | flashes continuously | off | flashes continuously | 1 flash | Power transistor overheating |
| E42 | flashes continuously | off | flashes continuously | 1 flash | Overcurrent |
| E45 | flashes continuously | off | flashes continuously | 1 flash | Inverter PCB communication fault |
| E47 | flashes continuously | off | flashes continuously | 1 flash | Inverter overvoltage (FDCVA251) |
| E48 | flashes continuously | off | flashes continuously | 1 flash | DC fan motor fault |
| E49 | flashes continuously | off | flashes continuously | 1 flash | LP (low pressure) fault |
| E51 | flashes continuously | off | flashes continuously | 1 flash | Inverter PCB fault |
| E53 | flashes continuously | off | flashes continuously | 1 flash | Suction thermistor fault |
| E54 | flashes continuously | off | flashes continuously | 1 flash | LP fault |
| E55 | flashes continuously | off | flashes continuously | 1 flash | Compressor dome temperature sensor fault |
| E56 | flashes continuously | off | flashes continuously | 1 flash | Power transistor thermistor fault |
| E57 | flashes continuously | off | flashes continuously | 1 flash | Refrigerant shortage |
| E59 | flashes continuously | off | flashes continuously | 5 flashes | Compressor startup error |
| E60 | flashes continuously | off | flashes continuously | 1 flash | Compressor charge position detection error |