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Carrier FX4BNF048000AAAA Defrost Sensor Board
The defrost sensor control board instructs the system to activate the defrosting phase which assists to rid your unit of frost that can build up. The defrost sensor board depends on a sensor located somewhere by the condenser to agree when the defrost cycle should begin.
Major signs your outdoor defrost sensor board will soon need to be replaced
- The defrost sequence never runs even though there is excessive frost that has built up
- The whole system may stop working due to frost blocking the fins on the outside unit
- The HVAC system control board may show an error code if the defrost board fails
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