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Carrier FY4ANF018000 Defrost Sensor Board
The defrost control board will begin the defrost sequence which may be necessary to get rid of the frost that collects on the outdoor unit. The control board looks to a defrost sensor located in the outdoor unit to decide when the defrost cycle should begin.
Symptoms of a faulty defrost board
- The AC may stop functioning due in part to too much frost
- Self defrost sequence never starts despite the fact that there is quite a bit frost that makes the unit run like crap
- The main circuit board may show a particular error code produced when the defrost control board fails to receive a signal
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