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Furnace keeps running thermostat off - Heating & Cooling

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Please check your fan switch to make certain it is in the "auto" position, not the "on" position.

Posted on Feb 12, 2012

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Posted on Jan 02, 2017

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I have a coleman furnace model 4066A656


Make sure your air filter is clean. Is the thermostat satisfied? or is the room temp. still below the thermostat setting? When ever you have to turn the power off and then back on to a furnace that usually indicates that the furnaces ignition control locked out. The first thing that I would try is cleaning the flame rod.

Mar 02, 2017 | Coleman Heating & Cooling

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Why does furnace fan keep running even with all thermostat wires disconnected?


The fan control circuit at the furnace could be defective but there also could be a separate manual switch controlling fan power.

Dec 01, 2015 | Thermostats Heating & Cooling

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Model sf35f furnace wont quit heating after reaching thermostat setting


Sounds like the heat anticipator in your thermostat is either bad or out of adjustment. Turn of the furnace power. Remove the thermostat wires from the thermostat. Turn the power back on. Connect the white and red wires together. The furnace should start up. Let it run a couple of minutes. Then disconnect the wires. The burners should shut off immediately. The blower will continue to run for 60 to 360 seconds then shut off. If this happens replace your thermostat. If the burners continue to burn, then your problem is either the furnace or the thermostat wires.

Sep 12, 2014 | Heating & Cooling

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Why does my Furnace exhaust cycle on and off while air conditioner is running?


Check all of your thermostat wiring between your furnace and thermostat. Check connections. Check for nicked wires.

May 28, 2014 | Heating & Cooling

1 Answer

Burner keeps running and heat is coming out of my baseboards with thermostat turned off


Disconnect the thermostat. You can usually do that either at the furnace or at the thermostat.

At the thermostat, remove the cover and find the red and white wires. Disconnect one of them, and leave it in the air.

At the furnace, the thin wires coming out of the furnace go to the thermostat. Usually, there will be a place you can disconnect them.

Once disconnected, the furnace should stop. If it does, you need a new thermostat. If it does not stop, you are in serious need of some furnace repair.

Sep 24, 2013 | Honeywell Programmable Thermostat Heater

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The fan runs all the time.


Disconnect your thermostat from the wall. If the fan shuts off then you probably have a bad or miswired thermostat.
If it continues to run, disconnect the thermostat wires from the furnace. If this shuts the fan off then you have a problem with the thermostat wires.
If the fan continues to run with the thermostat wires off of the furnace,
then you have a problem with the furnace.
Even though the fan stays on...... does the furnace still work? If so I bet you have a bad or stuck blower relay. If the furnace does not function other than the blower than you most likely have a safety control that is open. Worst case you could have a bad circuit board.
Good luck.....

Apr 10, 2009 | Honeywell Electronic Programmable...

1 Answer

My honey well thermostat keep clicking and I can't program it


If you have a programmable thermostat and it is a couple of years old you will probably have to install a new one. What kind of thermostat do you have? You can turn power off to furnace and then take thermostat off wall and take wires marked r & w and connect them together your heat should come on when you turn power back on. If not you could have blown the 5 amp fuse inside furnace. I would check the fuse inside of furnace. If you take panels off front of furnace you should find a controll board inside that runs furnace.If you have anymore question just reply back to me

Jan 07, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Mobile home furnace


you probably have a bad thermostat if it wont shut down id replace the thermostat first and then have the thermocoupler checked...replace the thermostat

Aug 20, 2008 | Heating & Cooling

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