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Carrier FX4BNB060000AAAA Defrost Sensor Board
The defrost sensor control board determines when or if to start the defrost sequence which may be necessary to remove frost build-up that may accumulate. The board depends on a specific sensor located in the outdoor unit to verify when the defrost cycle should begin.
Red flags the AC defrost sensor board needs a replacement ASAP
- Defrost session never initiates especially when there is frost in the way
- The system will stop functioning for the simple fact of frost blocking the fins on the outside unit
- The main circuit board could signify a specific error code produced when the defrost control board fails to receive a signal
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