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International Comfort Products NAC230AKA1 Furnace Door Switch
The furnace door switch is a safety switch which stops the vent fan and gas ignition from activating so as to avoid injuries. You should really have it substituted for a new part as quick as you can especially if you suspect it is not working properly.
Indications of a worsening safety switch on the furnace door
- The system cannot run whether the door is off or on
- The door switch looks wrong
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