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Lennox XP14-048 Furnace Door Switch
The furnace door switch is a safety switch which inhibits the blower and gas ignition from starting so as to avoid injuries. You should really have it substituted for a new part as quick as you can especially if you think it is defective.
Signs of an unhealthy switch on the furnace door
- The door mechanism looks like it is breaking off
- The furnace does not run with the door closed
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