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International Comfort Products T8MPL100J20B1 Furnace Door Switch
This switch stops the blower and ignitor being triggered to start so as to avoid injuries. Do not try to fix it, just have it switched out ASAP if you suspect that it is not working.
Major clues your furnace door switch is going out
- The door mechanism has been damaged
- The HVAC system will not operate whether the door is open or closed
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