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Mitsubishi MSZ-FA25VA Furnace Door Switch
The furnace door switch is a safety switch which prevents the fan and other risky devices from starting so as to avoid injuries. You must have the device swapped out immediately if you can, if you find it to be faulty.
Indications your furnace door switch has little life left
- The HVAC system does not run even with the door closed
- The door mechanism is worn
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