If you have a volt meter the best way to trouble shoot this is to use to test continuity from under the board on the solder joint of the pin to opposite end solder joint like on the fan motor, or under the connector of the heating element or at the heating element joint. This way you test the full extent of the wiring. Solder joint, the connector, wiring etc... When you find an open, work your way in to see where the open is. G
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