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Fan will not shut off when heat is on. Have thermostat set on 68. Has been running now for 3 hours.

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Hi,
Make sure the fan switch on the t-stat is not set to the "on" position....

If not then the fan or fan and limit switch in your furnace may be bad.....

or sometimes if your unit has a fan relay on the control board that will go bad and then the whole board needs to be replaced...

heatman101

Posted on Nov 07, 2010

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