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Temperature controller doesn’t work or is unstable.
Check whether the set temperature is reached.
Test the several higher temperature set points and check whether unit works normally.
Check the wiring.
Check whether the unit is correctly installed.
Check the temperature controller. Replace if failed.
The compressor cycles on/off frequently.
Check whether the airflow is blocked.
Check if the fan motor isn’t working.
Check whether capacitor of compressor is working normally.
Check whether the relay of compressor on PCB works normally.
Replace the PCB.
Check whether the capillary tube is blocked.
Replace the capillary.
Replace the compressor.
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Service Manual
Room Air Conditioner with R-410A
Heat Controller, Inc.
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