Midea R32 M thermal Arctic Mono fault EA

What it means

Discharge pipe temperature sensor error (serial number 11), sensor Tp. Displayed on user interface and refrigerant system main PCB.

Likely causes

1. Sensor Tp disconnected, sensor malfunction, wiring break, PCB connection issue
2. Discharge temperature lower than suction temperature for more than 5 minutes
3. Possible compressor malfunction
4. Refrigerant migration/flooding
5. Faulty temperature sensor
6. Sensor Tp fault
7. Sensor wiring fault
8. Hydronic box main PCB fault
9. Damaged cables between hydronic box main PCB and outdoor unit main PCB
10. Outdoor unit main PCB fault
11. Incorrect or abnormal input power supply (N or L)
12. Sensor not connected properly
13. Sensor short-circuited
14. Sensor resistance inconsistent with characteristics table
15. Pressure sensor failure
16. High pressure side blockage
17. Air side heat exchanger, fan or air outlet dirt/blockage
18. Water side heat exchanger, water piping, circulator pump or water flow switch dirt/blockage
19. Discharge temperature exceeding 105°C indicating high compressor load or high ambient/system conditions
20. Insufficient refrigerant caused by refrigerant leakage
21. Low pressure side blocked by crushed or bent pipe, blocked EXV, or dirty filter
22. Poor air side heat exchanger heat exchange in heating or DHW mode
23. Insufficient water flow rate in cooling mode
24. Outdoor main PCB fault (last resort)

Where to start

1. Check sensor Tp connection, measure sensor resistance, verify wiring continuity, test sensor response
2. Compare discharge temperature (Tp) to suction temperature (Th)
3. Check compressor operation