I have F16 error on my LA-MI heat pump. What does this mean?

Modified on Wed, 22 Feb 2023 at 10:01 AM

Applicable to models:  LA6MI, LA9MI, LA12MI, LA16MI


Issue:  Error code F16 shown on the display. No heat, compressor is stopped.  


What this means: F16 means excessive current draw has been detected, so the heat pump is shutting down 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.  

Note that only F-GAS qualified engineers are legally allowed to work on the system if they are leak checking, connecting to the refrigerant system or changing refrigerant components! 


Malfunction Decision Conditions:

During operation of cooling and heating, when outdoor current above 27.9A is detected by the current

transformer (CT) in the outdoor unit PCB.


Malfunction Caused:

1 Excessive refrigerant.

2 Faulty main Refrigerant PCB.


Abnormality Judgment:

Continue 3 times in 20 minutes. 



Possible parts, depending on engineer diagnosis: 

• 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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