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Gas furnace fan keeps bnlowing - Heating & Cooling

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It could be caused by two things:

1.The thermostat mounted on the wall and
2. the limit switch located on the furnace just below the plenum (the box that distributes heated air to all the ducts). The limit switch is designed to shut off the furnace if the air in the plenum gets too hot.

Check the thermostat to see if the "Fan" switch has been turned on. If it has, turn it to "Off" or to "Auto." If it is set to "Off" or "Auto," the furnace's limit switch must be adjusted.


Call a furnace repair technician to adjust the limit switch, or follow the instructions in your owner's manual to reset the pointers on the fan side of the limit control. The lower pointer should be set to about 90 degrees F., and the upper one should be at about 115 degrees F.

Posted on Oct 02, 2010

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Posted on Jan 02, 2017

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1 Answer

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York Diamond 90 furnace blows cold air


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1 Answer

Furnace fires up and heats to desired heat setting and burner shuts down , but the main blower continues to run on.


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1 Answer

Heater keeps going off on its on also fan not


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