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International Comfort Products T8MPN075B12B1 Furnace Door Switch
The furnace door switch is a safety switch which inhibits the fan and ignition sequence from switching on so as to stop a potential explosion. Do not try to fix it, just have it changed as quick as you can if it is defective.
Major red flags the safety door switch will need replacing
- The whole system will not begin whether the door is open or closed
- The switch appears as though it has been beat up
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