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If I turn the thermostat to heat or cool, only the blower turns on. If I turn to emergency the heater does work. I removed the furnace panel and found the LED light was blinking. What could be the problem?

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Inside your furnace will be a list of what the number of blinks means. These codes point to the problem that you have.

Posted on May 01, 2008

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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.

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Furnace Troubleshooting


On some natural or LP gas furnaces, the blower motor has to come on 1st
and then shuts off. This process starts the inital call for heat. If you find
yourself without heat and the blower does not run, turn the furnace to on
at the thermostat.

When changing the fan to on, you are changing the speed, if the heat comes on, that means you have a burnt out speed on your blower motor.

If nothing happens, change the fan speed at the control board.
In some instances they may be using the same blower speed in both the
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When turn on my fire place heater heats for about 5 sec. Then a little white light flash's it turns the in heat colls off blower never turns on


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If the blower in your gas furnace won't turn off, it can cause major problems with your home heating system ...

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Mar 7, 2014 - 16 posts - ‎5 authors Hi everyone, I'm having a problem with my Broan Electric furnace lately. Sometimes the blower motor doesn't want to switch on. Sometimes it ...

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My blower on my carrier furnace unit won't turn off? a/c or heater doen't turn on.


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yes, replace your stat but also make sure your wire going to y on the stat has not shorted with the wire going to the w on your t-stat. To check to make sure remove the t-stat and short the wire going to r to the y wire and the wire going to the g terminal if it has that. if cooling works with no heat it's more than likely in the stat, if heat comes on then you may have other wiring, circuit board issues

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I installed a honeywell CT87N thermostat. The


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Jun 19, 2010 | Honeywell Electronic Programmable...

1 Answer

Furnace not firing up...thermostat said low battery ...installed new batteries. Green (LED) light indicating power to thermostat is off. Furnace still doesn't fire up.


1) Turn the fan to on and if it runs you know that you have line
voltage to furnace and 24volts to the thermostat.

2) You could turn the furnace off remove the doors and get to the
control board. If you can find the Thermostat wires on the board
mark and remove them. If you have a typical Furnace and you
have some electrical background put a jumper wire between
terminals R and W,put the doors back on-there is a door switch
that if the panel is not put back on-it will not run. Turn your power
back on.

3) The Blower motor may come on, the induced draft blower should
come on, the glow coil should glow, the gas valve open and the
burners should come on and the unit should run.

4) If all of this happens, then you have a thermostat problem or you
have bad thermostat wires.

5) If nothing happens then you don`t have power to the furnace or the
little fuse that protects the transformer is blown.

Good Luck

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Is there a setting on the thermostat for Auto or Fan? If so, make sure it is in the Auto setting. You will have a contactor that turns on the elements and a relay for the fan. Follow the wiring diagram to see which relay energizes the fan then unplug it to see if the fan stops.

Nov 02, 2009 | Heating & Cooling

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The furnace send signal to the fan in about 30 seconds, now this fan is set in auto from my termostat, my problem is the fan is starting slowly and some time it don't start, but if I use the option manual...


Depending on the model of the furnace, the blower is either a 2 or 3 speed. When the furnace operates in heating mode with the thermostat in the auto position, the furnace starts the fan when the furnace reaches a specific temperature or after a set time delay, but it operates the fan in low or med low speed on heat mode, when you put the thermostat fan switch in the "ON" position, the furnace operates the fan in "HI" speed, the same speed used for cooling mode. You may have a blower moter that is starting to short. I would recommend having a professional replace the motor before now before it becomes an emergency in the middle of the night during a cold spell.

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1 Answer

Rheem heat pump. blower will not turn off


The fans are set to delay for 60-90 seconds to remove all heat from the heat exchanger/heater elements.

If the fan runs any longer than 3-4 minutes after the Emergency Heat shuts off, you may have a bad sequencing relay in the air handler.

Jan 27, 2009 | Heating & Cooling

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