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Carrier 58MCB140 Furnace Door Switch
A furnace door switch is a switch that inhibits the vent fan and ignition sequence from starting in order to prevent injury and fire. You should really have it switched out immediately if you can, if it is defective.
Major clues of a faulty safety switch on the furnace door
- The door switch appears to be bent
- The system does not function even when you close the door
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