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Carrier 48JZ036090300 Furnace Door Switch
A furnace door switch is a safety feature that stops the draft inducer and ignitor from starting in order to prevent injury and fire. You must have the device changed promptly if it is defective in some way or another.
Some warnings of a weakening safety door switch
- The safety door switch seems to be not there
- The HVAC system will not run even with the door closed
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