I have F14 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 F14 shown on the display. No heat, compressor is stopped.  


What this means: F14 means a compressor rotation failure has been detected.

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:

A compressor rotation failure is detected by checking the compressor running condition through the position

detection circuit.


Malfunction Caused:

1 Compressor terminal disconnect.

2 Faulty outdoor unit PCB (main).

3 Faulty compressor.


Abnormality Judgment:

Continue 4 times in 20 minutes. 

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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