Question about Coleman Propane Forced Air Heater w/Electronic Ignition (50,000-80,000 BTU)

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Furnace blower motor turns on and off all the time...

While the thermostat is NOT calling for heat. I just replaced the thermostat with a programmable one but it did the same thing with the old thermostat. I just replaced the blower motor (was seized up probably from drywall dust) but it did not change the situation, other than fan working well now.

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Blower will not shut off. will only shut off by turning off circuit breaker. changed thermostat. no help. what should i check?

Posted on Nov 07, 2010

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Posted on Jan 02, 2017

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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
heat and cool mode.

on Jan 19, 2010 | Heating & Cooling

1 Answer

How do I wire a whole house humidifier to my furnace?


You could wire the Humidifier to the HUM terminal on the Furnace integrated control board, this would allow the humidifier to start only when the blower motor energizes.

May 13, 2014 | Heating & Cooling

1 Answer

When i turn the heat up sometimes it takes a long time for the gas furnace to start ..why?


Watch your furnace when you turn the thermostat up...make sure to record everything that it is doing. If you have an induced draft, forced air system, then the heat sequence of order should go like this... Initial call for heat from tstat, Inducer vent motor turns on-pulls in the pressure switch, circuit board sends power to igniter whether it is spark or hot surface, then gas valve opens. Flame sensor senses flame, burner stays on, and blower motor kicks in to heat the space. If you notice any variance from this, then something needs to be checked by an HVAC Service Tech.

Dec 14, 2013 | Honeywell Programmable Thermostat Heater

1 Answer

I have a Johnson aire ease ultra 90 gas furnance. I also have a outdoor wood furnance that has its own thermostat. On the original thermostat I turn the blower in the on position. I then set the outdoor...


I would first eliminate one furnace from the equation, the exterior wood furnace... turn its tstat down. Will the gas furnace then operate normally? Can you run the blower manually, as in summer mode? Make sure your filters are clean also... that can sometimes overload the blower.

Apr 12, 2017 | Heating & Cooling

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I have a lennox furnace that is about 25 years old and for the last few days it doesn't want to kick on. I replaced the thermostat thinking that was the problem, but it wasn't. The problem that I'm having...


I would suggest that you have someone turn thermostat up to call for heat while you are watching. Being that old it may or may not have a induced draft motor on it. It it does the draft blower should come on first, then spark igniter,then pilot ,next the main burner,and after a short period the main blower. If you do not have induced draft motor the spark igniter should come on as soon as thermostat calls for heat. If it doesn't I would check all electrical connections making sure they are all clean and tight fitting. Just follow it through step by step . You can use volt meter to check across red and white wires from thermostat to where they hook into furnace. When you are calling for heat you should read about 24 volts. I would be inclined to replace spark igniter but if it does what it's is suppose to then I would go to gas valve. It might be worth your time to check connections on t-stat. I have occasionally seen wires that were broke under screw and some time make connection and other times not. You can also remove red and white wires from t-stat and temporairly touch them together. this should turn heater on. Hope this helps. Thanks.

Nov 14, 2010 | Heating & Cooling

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Ihave a Goodman GUS075-3 model. Turned the heat on for the first time this year. After abt 5 mins. running it started to smell like it was on fire, the breaker shut off. Now,the pilot keeps going out and...


I would suspect that your fan motor burned out. What I would suggest is wait about 1/2 hour with thermostat turned down to lowest setting where it is not trying to turn furnace on. I would then turn thermostat back up to call for heat and see what happens. Most electric motors have a thermal overload on them and if its on motor will not run until it cools back down. Even if this works I would recommend that you have motor replaced and clean blower. Hope this helps. Thanks

Nov 04, 2010 | Goodman Heating & Cooling

1 Answer

Outside heating unit runs all the time


Usually when the furnace blower motor runs all the time
The limit switch or rollout switch is usually open or bad.
The furnace board is seeing that one of those switches is open, so it brings the blower on to try to get the heat out of the combustion chamber area, so the switch will close. But if the switch is bad and won’t close, the furnace board will keep the blower running continuously.

Feb 19, 2010 | Heating & Cooling

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Thermostat calls and from time to time won't ignite


I would first look at any wire connections both at the furnace and the thermostat. Then I would replace the thermostat. Check the units control board when it does not start for an error code. There should be a small viewing port to look into the furnace cabinet to see the control board.

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Feb 12, 2010 | Goodman Heating & Cooling

1 Answer

Honeywell thermostat TH6110D1021. Blower comes on


Hi, You are right, fan is on a time delay in the heating cycle, and after burners fire that is when this delay comes into play. You have a preset factory temperature that determines the cycle on time for the fan, and the off time after the burners shut down also. This will not be in the thermostat, but in the fan/limit control the is mounted on the face of the furnace, with a probe inserted into the fire box.Depending on how old or new this unit is, will depend on the type control you have.It may be just a high limit switch, or the 1st I mentioned.If so, It rotates in the burner as the temperature rises, to turn the fan on and off.Disconnect power, remove cover, and 2 screws.Slowly remove the control and gently clean the probe. Turn the dial if this one has it and you will be able to hear it click. This click is contacts closing to start fan operation.Reinsert and try again. If problem continues, you will have to replace it.They do tend to stick closed/on, in the heat cycle from time to time and a cleaning sometimes will solve this problem. Not knowing how old this furnace is and type, make it difficult to give you a correct diagnosis, so check this fan control as I have explained, and if your system is of a different type, please let me no so I can correct this problem. Sincerely,
Shastalaker7

Dec 11, 2009 | Honeywell Programmable Thermostat Heater

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