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International Comfort Products NDN5050BFB1 Furnace Door Switch
The furnace door switch is a safety switch which prevents the blower and ignition sequence from activating in order to prevent injury and fire. You should really have it switched out quickly if you find it to be faulty.
Simple indications poorly running safety switch on the furnace door
- The whole system will not even begin to start whether the door is open or closed
- The safety door switch has been chipped
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