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Carrier 58STX09010014 Defrost Sensor Board
The defrost control board instructs the system to activate the defrost cycle if necessary, to keep the outdoor unit free from frost build-up. It depends on a defrost sensor located somewhere by the condenser to make the decision on when the defrost cycle should begin.
Major signs your defrost board will have to be replaced
- AC and heating system could not run due in part to the safety features installed
- The defrost sequence has not run for quite some time despite that there is a large amount frost built up
- The control board could throw an error of some type if the defrost board goes out
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