I have F22 error on my LA-MI heat pump. What does this mean?

Applicable to models:  LA6MI, LA9MI, LA12MI, LA16MI


Issue:  Error code F22 shown on the display. No heat, compressor is stopped.  


What this means: F22 means the power transistors are overheating so the system has stopped to protect itself.

Action: Engineer will need to investigate by following the information below:

Heat pump must be safely isolated from mains supply before carrying out any electrical work! Where mains voltages are being measured, this should only be carried out by suitably qualified personel.  

Malfunction Decision Conditions:

During operation of cooling and heating, when temperature 95°C is detected by the outdoor IPM temperature



Malfunction Caused:

1 Faulty outdoor unit fan motor.

2 Faulty outdoor unit PCB (main).


Abnormality Judgment:

Continue 3 times in 30 minutes. 



Possible parts, depending on engineer diagnosis:  

• Fan Motor (comes without impellor or nuts, so re-use the old ones).

LA6MI / LA9MI part: X-2511025

LA12MI / LA16MI upper motor part: X-2511045

LA12MI / LA16MI lower motor part: X-2511046.


• Main Refrigerant PCB, aka "Outdoor PCB" (part number depends on model of heat pump)
LA6MI part: X-2511024
LA9MI part: X-2511038
LA12MI part: X-2511044
LA16MI part: X-2511057



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