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International Comfort Products HHP042GKA1 Furnace Door Switch
A furnace door switch is a safety feature that stops the vent fan and other risky devices from turning on so as to stop a potential explosion. You should have the switch be substituted for a new part immediately if you can, if it is defective in some way or another.
Clues poorly running safety switch on the furnace door
- The system will not even begin to start with the door closed
- The switch appears as though it has been worn down
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