Midea R32 M thermal Arctic Mono fault L9

What it means

Triggered when actual compressor frequency differs from target frequency by more than 15Hz, 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. Actual compressor frequency differs from target frequency by more than 15Hz
5. Compressor control fault
6. Load fluctuation
7. Sensor fault
8. Discharge temperature exceeding 105°C indicating high compressor load or high ambient/system conditions
9. Crushed or bent pipe
10. Blocked EXV
11. Dirty filter
12. 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. L9 error shows 17 flashes and stops for 1 second, then repeats with LED302 always on red