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Haier CPN12XC9 Furnace Door Switch
A furnace door switch is a safety feature that inhibits the fan and ignition sequence from starting so as to avoid injuries. Do not try to fix it, just have it changed immediately if you can, especially if you suspect it is not working properly.
Main clues the switch on your furnace door is in dire straights
- The furnace door switch looks as if it has been beat up
- The furnace does not begin to work whether the door is off or on
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