no defrost cycle ice on coil

by Pat
(Richmond, Va)

Defrost cycle not working ice on coils while heat pump is running

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Jan 21, 2014
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ice
by: Anonymous

ice forms on out side unit is this the defrost not
working

Dec 09, 2013
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Sounds like a problem with the defrost
by: Anonymous

You will have to diagnose potential problems with the following:

- defrost board
- defrost control relays
- defrost sensor
- defrost thermostat

or other defrost related problems:

- bad reversing valve/solenoid or hot gas bypass valve
- insufficient outdoor airflow

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