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International Comfort Products NDN5050BFC2 Defrost Sensor Board
The defrost sensor control board instructs the outdoor unit to begin the defrost cycle if necessary, to keep the outdoor unit free from frost build-up. The control board depends on a temperature sensor located somewhere by the condenser to agree when to initiate the defrosting cycle.
Subtle hints your defrost board is dead
- Unit defrost session has not run for quite some time even though there is a lot of frost on the unit
- The control board might issue a type of error code if the defrost board goes out
- The HVAC system could cease to operate for the simple fact of frost blocking the airflow outside
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