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Can your furnace over heat

Updated: 8/18/2019
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14y ago

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yes it certainly can. Gas furnaces usually have a Fan/Limit combo switch. It has a helix coil that heats up and triggers the fan to start when it reaches operating temperature. When it gets too hot, it breaks the low voltage to the gas valve and shuts off the burners. As it cools off, the helix relaxes and will fire back up.

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14y ago
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