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International Comfort Products NTG3050FBA1 Furnace Door Switch
The furnace door switch is a safety switch which blocks initial fan and ignitor from turning on so as to stop a potential explosion. You should really have it switched out as quick as you can if you find it to be faulty.
Important red flags of an ailing safety switch on the furnace door
- The furnace door switch is eroded
- The whole system does not fire up whether the door is off or on
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