HVAC Defrost Troubleshooting | Timers, Sensors and Boards
March 25, 2026
Learn how defrost timers work (30, 60, and 90-minute runtime cycles), how to test and jump defrost sensors, how to speed up the timer for quick testing, and how to identify failing relays that mimic fan motor issues. We also cover how to trace shorts past the defrost board all the way to the contactor — because the board isn’t always the culprit!
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