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International Comfort Products HMH Furnace Door Switch
A furnace door switch is a safety feature that inhibits the fan and ignitor from activating in order to prevent injury and fire. You should have the switch be exchanged for a new one at once especially if you suspect it is not working properly.
Some clues the safety door switch is dead
- The furnace door switch seems broken
- The HVAC system cannot run even when you close the door
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