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Friedrich MR09C1H Furnace Door Switch
The job of the furnace door switch stops the vent fan and gas ignition from activating in order to prevent injury and fire. It is extremely important that the device is exchanged for a new one ASAP if you see that it is broken.
What warnings should I watch out for to know if my safety furnace door switch really needs to be replaced?
- The furnace door switch appears as though it has been fallen off
- The system does not turn on whether the door is open or closed
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