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Lennox CB30U-46 Furnace Door Switch
This switch blocks the vent fan and gas ignition being triggered to start so as to stop a potential explosion. You must have the device replaced ASAP if it is causing you problems.
Major symptoms the switch on your furnace door is going to die
- The whole system does not even thing about starting whether the door is open or closed
- The furnace door switch seems messed up
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