Midea R32 M thermal Arctic Mono fault E5

What it means

E5 indicates an air side heat exchanger refrigerant outlet temperature sensor error. M thermal Mono stops running. Error code is displayed on refrigerant system main control board for refrigerant system and user interface.

Likely causes

1. Sensor T3 fault
2. Sensor wiring fault
3. Temperature sensor not connected properly or has malfunctioned
4. Damaged refrigerant system main PCB
5. Insufficient refrigerant caused by refrigerant leakage
6. Low pressure side blocked by crushed or bent pipe, blocked EXV, or dirty filter
7. Poor air side heat exchanger heat exchange in heating or DHW mode
8. Insufficient water flow rate in cooling mode
9. Outdoor main PCB fault (last resort)
10. Inverter module damaged
11. Main board fuse damaged/blown
12. Hydronic box main PCB fault
13. Damaged cables between hydronic box main PCB and outdoor unit main PCB
14. Outdoor unit main PCB fault
15. Incorrect or abnormal input power supply (N or L)

Where to start

1. Check sensor T3 and its wiring
2. Check if sensor connection on refrigerant system main PCB is loose and ensure it is connected properly
3. Measure sensor resistance and compare to resistance characteristics table to determine short-circuit or failure