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Payne PH3ZNA024000AA Furnace Door Switch
The furnace door switch is a safety switch which prevents the vent fan and burner from turning on so as to avoid injuries. You should have the switch be swapped out ASAP if it is defective in some way or another.
Hints to watch for in a bad furnace door switch
- The system will not start even when you close the door
- The switch is chipped
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