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International Comfort Products GDJ125M20C1 Furnace Door Switch
The furnace door switch inhibits the vent fan and other risky devices from activating so as to stop a potential explosion. Do not try to fix it, just have it switched out immediately if you can, if it is defective in some way or another.
Major symptoms your furnace door switch is on its last leg
- The door mechanism appears to be broken
- The furnace does not even thing about starting with the door closed
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