Midea R32 M thermal Arctic Mono fault L8

What it means

Detected when compressor frequency changes by more than 15Hz within one second, detected by refrigerant system main PCB. Displayed as P6/H4 on user interface.

Likely causes

1. Wire not connected properly
2. Inverter module PCB malfunction
3. Compressor failure
4. Excessive compressor frequency variation greater than 15Hz within 1 second
5. Compressor instability
6. Load fluctuation
7. Discharge temperature exceeding 105°C indicating high compressor load or high ambient/system conditions
8. Crushed or bent pipe
9. Blocked EXV
10. Dirty filter
11. Compressor current exceeding Currentmax threshold

Where to start

1. Check if wire is connected properly
2. Check if inverter module PCB has malfunctioned
3. Check LED301 flashing pattern on inverter module. L8 error shows 16 flashes and stops for 1 second, then repeats with LED302 always on red