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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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 | Heaters

1 Answer

Heil furnace blower motor stays on won't shut off at thermostat blows cold air continuously


Do you have t sat fan switch in on position??? If so blower will run continously set it to auto and it will cycle with heat call

Nov 12, 2012 | Heaters

1 Answer

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 | Heaters

1 Answer

Furnace blower won't turn on... Forced air gas furnace was working fine for three weeks. Now: Turn themostat up Gas comes on, pilot light obviously working Box heats up for about 90 seconds Humidifier...


If it indeed started that one time for a short period then cut out, the first place that I would start would be the capacitor located in the blower compartment. The capacitor gives the motor the need kick to start, and often times stays in the circuit to help the motor run more effeciently. This could very well be the problem.

If you have the option to run the fan from the thermostat, turn the fan to the "on" position and see if it starts. If it does, then it is not the capacitor.

Hope this helps

PS Your are correct about the "sensor" turning the furnace off, it is called a high limit switch and is there for safety. It is an automatic reset device, and will reconnect power once it has cool suffeciently.

Nov 10, 2010 | Dayton Gas Furnace Heater

1 Answer

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 Heaters

1 Answer

I have an 11 year old natural gas forced air furnace--a Goodman GMPN100-4 Rev B, which is 100K BTU and 92% efficient which was working fine at the end of last winter. I went to turn it on for the first...


You are correct. If the inducer motor is warm, but not running, it has seized up. If you replace this yourself, I also suggest that when you replace the inducer fan, check to make sure the secondary heat exchanger isn't clogged, or the condensate drain(s). If you have an HVAC contractor replace it, he should do this for you. It shouldn't run more than $350, to have it replaced and he can check for clogs (The price I'm quoting is for standard hours).

You can check this yourself by running the inducer fan without it being attached to the furnace, then attaching it to the furnace. If you notice a significant reduction in airflow, then you have a clogged secondary heat exchanger. I've run across this situation before on this particular model. The owner recenly replaced the inducer motor, but couldn't figure out why he was still having problems. I suspect the clogged heat exchanger contributed to the inducer motor to failing previously, and feel It would definitely be worth checking while you have the fan removed to help eliminate any future problems that could result from this, including heat exchanger failure. The manufacturer of this unit actually recommends you clean the secondary heat exchanger every year, but this is overkill if your furnace was installed and set up properly. I'd recommend doing it every 10 years and you're at that mark now. Instructions on how to do this are in the manual for this unit if you have it. Otherwise, e-mail me at wheels38_97@yahoo.com and I can send you a copy.

Finally, check the limit and flame roll out switches after replacing, as they could have tripped when the motor failed.

Oct 22, 2010 | Heaters

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 | Heaters

1 Answer

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 Heaters

2 Answers

Ruud furnace Model URKA A030jK08 Code opt 589


Flip the lower panel over and look for a wiring diagram. On that diagram there will be a diagnostic chart. Let me know what 5 blinks represent. Then I want you to read on.

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).

Nov 23, 2009 | Heaters

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