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International Comfort Products N9MP2075B12C1 Furnace Door Switch
A furnace door switch is a safety feature that stops the blower and burner being triggered to start so as to avoid injuries. Do not try to fix it, just have it swapped out ASAP if it is defective in some way or another.
Major clues the switch on your furnace door has very little life left
- The door switch looks not there
- The furnace does not operate with the door closed
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