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Carrier FF1DNA024005AAAA Furnace Door Switch
The furnace door switch blocks the vent fan and other risky devices being triggered to start in order to prevent injury and fire. You should really have it swapped out promptly if you see that it is broken.
Signs of a dying safety switch on the furnace door
- The whole system does not begin to work with the door closed
- The furnace door switch appears to be chipped
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