Midea R32 M thermal Arctic Mono fault HF

What it means

Error code 54. Refrigerant system EEPROM error detected by user interface and refrigerant system main PCB.

Likely causes

1. Refrigerant system main PCB EEPROM is not connected properly. Refrigerant system main PCB damaged.
2. EEPROM fault
3. Hydronic box main PCB fault
4. Main board fuse damaged/blown
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. Damaged cables between hydronic box main PCB and outdoor unit main PCB
12. Outdoor unit main PCB fault
13. Incorrect or abnormal input power supply (N or L)

Where to start

1. Verify refrigerant system EEPROM is connected properly.
2. Verify refrigerant system EEPROM is not connected properly. If yes, ensure the EEPROM is connected properly. If no, replace refrigerant system main PCB.
3. Check if refrigerant system EEPROM is not connected properly. Check if refrigerant system EEPROM is not connected properly. If not connected properly, ensure the EEPROM is connected properly. If connected properly, replace refrigerant system main PCB.