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Nordyne CMF Furnace Door Switch
A furnace door switch is a safety feature that blocks the fan and ignition sequence from turning on so as to stop a potential explosion. It is vital that this part be traded for new one ASAP especially if you think it is defective.
Major signs the safety door switch has very little life left
- The system does not begin to work whether the door is off or on
- The switch looks like it is worn down
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