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Nordyne M3RL-080A-BW Furnace Door Switch
This switch blocks the fan and burner from turning on so as to avoid injuries. Do not try to fix it, just have it replaced at once if you suspect that it is not working.
Some clues the switch on your furnace door is in need of replacing
- The furnace does not even thing about starting whether the door is open or closed
- The safety door switch looks as if it has been broken
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