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Carrier 58STA07010012 Furnace Door Switch
The furnace door switch blocks the fan and ignitor from turning on so as to stop a potential explosion. It is quite important to have it switched out promptly if it is defective in some way or another.
Subtle cues of a bad furnace door switch
- The switch appears as though it has been stuck
- The HVAC system will not start even with the door closed
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