Question about Heating & Cooling
Your thermostat has a feature for the fan AUTO or ON. If it is in the AUTO position and still won't shut down then I would check the Fan relay. Newer models have a control board with the relays built into them so the control board would be suspect. Older models use a Fan/limit. The limit has a probe in it. As the heater warms the bi-metal inside it twists around and the fan comes on at about 110f. When the thermostat is satisfied the burner shuts down but the fan still runs till the heater cools down the bi-metal cools off and shuts down that fan. These will hang up with age.
Posted on Nov 11, 2010
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Posted on Jan 02, 2017
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