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Lennox HP40-024 Furnace Door Switch
The furnace door switch stops initial fan and other risky devices from switching on in order to prevent injury and fire. You must have the device changed ASAP if it is defective in some way or another.
Clues your furnace door switch is on its last leg
- The whole system will not run even with the door closed
- The door switch appears as though it has been fallen off
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