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International Comfort Products VNK050F12A1 Furnace Door Switch
A furnace door switch is a safety feature that stops the fan and ignition sequence from switching on in order to prevent injury and fire. You must have the device replaced ASAP if you suspect that it is not working.
Major symptoms of a defective safety furnace door switch
- The safety door switch looks like it is chipped
- The whole system does not begin to work even with the door closed
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