How to know the defrost board is bad? Part 2

How to test the defrost thermostat?
Video Link
https://youtube.com/shorts/PJ6zkJ92Di4

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How Demand Defrost works on Package Heat Pump?
https://youtu.be/NfuFjmCHIGo

How to know the defrost board is bad? Part 1 Video
https://youtube.com/shorts/nCXlURWhMJI

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