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International Comfort Products N9MP1100J20C1 Furnace Door Switch
The furnace door switch is a safety switch which prevents initial fan and ignition sequence from turning on so as to stop a potential explosion. It is extremely important that the device is switched out quickly if it is damaged so as to prevent something bad happening.
Some clues your safety switch on the furnace door will need replacing
- The furnace door switch looks as if it has been fallen off
- The furnace does not fire up whether the door is open or closed
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