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EdgeStar AP12000S Furnace Door Switch
This switch stops the fan and other risky devices from starting in order to prevent injury and fire. It is quite important to have it replaced ASAP if it is causing you problems.
Major symptoms the safety door switch will not live much longer
- The furnace door switch appears as though it has been fallen off
- The whole system will not even begin to start whether the door is open or closed
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