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International Comfort Products PGMD48G0904 Defrost Sensor Board
The defrost control board instructs the outdoor unit to begin the defrost sequence which may be needed in order to remove frost build-up that may accumulate. The defrost board looks to a sensor located in the outdoor unit to make the decision on when to initiate the defrosting cycle.
Some clues the defrost sensor board is in dire need of a replacement
- Self defrost sequence does not begin despite the fact that there is a lot of frost that makes the unit run like crap
- The HVAC system could stop operating due to frost blocking the airflow outside
- The control board could signify a specific error code if the defrost control board fails
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