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International Comfort Products NTN3100KFA1 Furnace Door Switch
The furnace door switch blocks the blower and ignition sequence being triggered to start so as to avoid injuries. You should have the switch be swapped out at once if it is not working in order to prevent injuries.
Major indications your safety switch on the furnace door has very little life left
- The furnace does not operate whether the door is off or on
- The furnace door switch seems broken completely
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