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International Comfort Products T9MPD050F12B1 Defrost Sensor Board
The defrost sensor control board controls when to launch the defrost sequence which aids to keep the outdoor unit free from frost build-up. The control board looks to a specific sensor located in the outdoor unit to verify when the defrost cycle should begin.
Simple indications to watch for in a failing defrost board
- Unit defrost session never starts even though there is excessive frost that has built up
- The AC may not run at all because of way too much frost build-up
- The main circuit board may show a particular error code when the defrost board fails
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