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International Comfort Products T9MPD100J14A1 Furnace Door Switch
A furnace door switch is a safety feature that blocks initial fan and ignition sequence from activating in order to prevent injury and fire. Do not try to fix it, just have it exchanged for a new one immediately if you can, if it is damaged so as to prevent something bad happening.
Major red flags your furnace door switch needs a replacement ASAP
- The HVAC system does not operate whether the door is open or closed
- The safety door switch seems to be chipped
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