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International Comfort Products H8MPN075B12A1 Furnace Door Switch
This switch inhibits the draft inducer and other risky devices from activating so as to stop a potential explosion. You should really have it substituted for a new part immediately if you can, if it is defective.
Elements of a defective safety switch on the furnace door
- The system will not run whether the door is off or on
- The switch has been broken completely
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