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Friedrich MW09Y3H Defrost Sensor Board
The defrost sensor control board is jobbed with determining when to begin the defrost sequence in order to remove frost build-up that may accumulate. It relies on a defrost sensor located in the outdoor unit to ascertain when to initiate the defrosting cycle.
Clues of a dying AC defrost sensor board
- Most systems will cease to operate for the simple fact of frost blocking the fins on the outside unit
- Defrost mode has not run for quite some time despite that there is a large amount frost built up
- The main circuit board may show a specific error code if the defrost board fails
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