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International Comfort Products H8MPL050B12A1 Furnace Door Switch
The furnace door switch is a safety switch which stops the blower and ignitor from switching on in order to prevent injury and fire. Do not try to fix it, just have it switched out as soon as possible especially if you think it is defective.
Subtle cues to watch for in a bad safety switch on the furnace door
- The door switch has been breaking apart
- The system will not operate whether the door is open or closed
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