I have H15 error on my LA-MI heat pump. What does this mean?

Applicable to models:  LA6MI, LA9MI, LA12MI, LA16MI


Issue:  Error code H15 shown on the display. No heat, compressor is stopped.


What this means: Compressor temperature sensor abnormality.

Until an engineer can attend, it should still be possible to use the electric backup. To enable the backup search for the guide "How to I switch on the backup on the LA-MI heat pump?" on the GDHV Help Centre.


Action: Engineer visit needed. Heat pump must be safely isolated from mains supply before carrying out any work! Engineer to check the sensor cable connection onto the PCB & check probe resistance vs known temperature, following the flow chart:

Location of CN-TANK temperature probe on compressor:

Location of CN-TANK connector plug on main Refrigerant PCB (LA6MI / LA9MI):

Location of CN-TANK connector plug on main Refrigerant PCB (LA12MI / LA16MI):

Possible parts, depending on engineer diagnosis:

• Compressor temperature sensor "CN-TANK" for LA6MI or LA9MI part: X-2511020.
Same sensor can be used for LA12MI / LA16MI but cable may need to be extended.

• Main Refrigerant 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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