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My wall heater fan keeps going on and off without any adjustment to the thermostat???When I turn if off at the thermostat, it takes several minutes to stop doing that.

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Honestly they or designed to run till the temp inside has cooled down. This is normal. I hope this helps.

Posted on Dec 17, 2008

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Why is it that when I switch off the heater the fan stops instead of the fan keeping going for a couple of minutes like it use too it now turns off at the same time can anyone help?


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Unless you have a newer furnace, the fan is controlled by plenum temp. Works like this: burner turns on, no fan until the plenum temp reaches set temp,....then burner off, and fan keeps running until pelnum temp drops, and often the fan may kick on a few more times as this temp depletes.

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If you see frost behind the back wall or begin to notice the fresh food compartment getting warmer then you might have a defrost problem. The defrost system is a heater and termination thermostat inside the evaporator and A timer. The termination thermostat shuts down the heater when it gets to be warm enough for the frost to melt. It is important for the thermostat to kill the heater because the defrost mode is 21 minutes long.
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Some programmable thermostats have a circulate feature. This feature will allow your fan to run approx. 20 minutes per hour. This will insure better circulation, a better balanced temperature throughout the home & better air quality do to more air filtration. Read your thermostat manual to see if your thermostat has this feature and how to turn it off if needed. Another possibility would be on an older furnace with a fan limit control. If the temperature settings are set to low on the fan limit (or if the control is malfunctioning) you could experience a fan that runs a lot even if the thermostat is off.

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