Midea R32 M thermal Arctic Mono fault P4

What it means

Error code 24. Discharge temperature protection detected by user interface and refrigerant system main PCB.

Likely causes

1. Discharge temperature exceeds 115°C
2. Insufficient refrigerant charge
3. Excessive compressor load
4. Poor heat rejection at condenser
5. Abnormally high discharge temperature, transient temperature spikes High ambient temperature, refrigerant undercharge, expansion valve malfunction, compressor overload
6. Dirt/blockage on air side heat exchanger, fan or air outlets
7. Dirt/blockage on water side heat exchanger, water piping, circulator pumps or water flow switch
8. Excessive discharge temperature
9. Refrigerant charge issue
10. Compressor fault
11. Discharge temperature exceeding 105°C indicating high compressor load or high ambient/system conditions
12. Crushed or bent pipe
13. Blocked EXV
14. Dirty filter
15. Compressor current exceeding Currentmax threshold

Where to start

1. Measure discharge temperature
2. Monitor discharge temperature during operation Check discharge temperature reading, verify refrigerant charge level, inspect expansion valve
3. Check compressor operating conditions