I have F23 error on my LA-MI heat pump. What does this mean?

Modified on Wed, 22 Feb 2023 at 10:02 AM

Applicable to models:  LA6MI, LA9MI, LA12MI, LA16MI


Issue:  Error code F23 shown on the display. No heat, compressor is stopped.  


What this means: F23 means there is an issue with the DC peak detection within the heat pump, so it 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 outdoor DC current is above 40.1 ± 5.0A (for: LA6/9MI) OR

44.7 ± 5.0A (for: LA12/16MI) is detected by the IPM DC Peak sensing circuitry in the outdoor unit Refrigerant PCB (main).


Malfunction Caused:

1 Faulty main Refrigerant PCB.

2 Faulty compressor.


Abnormality Judgment:

Continue for 7 times. 



Possible parts, depending on engineer diagnosis: 

• Compressor

LA6MI / LA9MI part: X-2511011

LA12MI / LA16MI part: X-2511040
(Note LA-MI does not employ a filter dryer, so if replacing the compressor, the system must be throughly vacuumed).


• 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

Require additional help? Please follow link below


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