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Combustion blower turns on and never stops running

I have a Lennex furnace 80MGF. The combustion chamber blower stays running. I have checked the outlet to make sure that it was not plugged all ok. It will not allow the furnace to start becauce this is always running. I dont know what else it could be. I have checked the wiring and i have checked the wire connections. I can get the furnace to run one cycle by tricking the pressure switch. Please help.

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  • Bret Maynard
    Bret Maynard Mar 10, 2009

    i have tried that and it is still the same

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Sounds to me like the furnace isn't getting enough fresh air for combustion and the pressure switch isn't closing. try taking the cover off the burner assembly and c if that works

Posted on Mar 10, 2009

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Tip

When the furnace blower 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.
Make sure the fan switch on the thermostat is not in the "ON" position it should be in the "AUTO" position.

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I have a goodman mfg gmp100-4 furnace. When I turn theromsat to heat I hear blowing for sixty seconds but that is all that happens. What should I check first?


Your furnace has a combustion blower on it. If it runs and don't pull in the vacuum switch the furnace will not start. On the combustion blower you will find a little rubber hose follow that hose to the vacuum switch. You will see 2 wires on the vacuum switch connect the 2 wires on the vacuum switch together. If your furnace starts and runs fine for 15 to 20 minutes you need a new vacuum switch. Try this first

in this image A is vacuum switch B is combustion blower

Hope this helps......





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1 Answer

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1 Answer

Furnace blower won't stop running


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.

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Main limit switch


I am providing some information, but I encourage you to have a furnace technician look at your furnace. The reason is; the limit switch trips when there is a problem that may present a fire or combustion hazard. I've seen these switches go bad, but not very often. Usually they are tripping because the plenum is sooted up and excessive heat builds in the combustion chamber. This is common in older furnaces that have pilot flames- the flame runs all year and soot deposits in the plenum, plugging the air flow through the combustion chamber after years of use.

The limit switch is a safety control switch located on the furnace just below the plenum. If the plenum gets too hot, the limit switch shuts off the burner. It also shuts off the blower when the temperature drops to a certain level after the burner has shut off. If the blower runs continuously, either the blower control on the thermostat has been set to the ON position or the limit control switch needs adjustment. Check the thermostat first. If the blower control has been set to ON, change it to AUTO; if the blower control is already on AUTO, the limit switch needs adjusting.

To adjust the switch, remove the control's cover. Under it is a toothed dial with one side marked LIMIT; don't touch this side. The other side of the control is marked FAN. There are two pointers on the fan side; the blower goes on at the upper pointer setting and turns off at the lower pointer setting. The pointers should be set about 25 degrees apart. Set the upper pointer at about 115 degrees Fahrenheit and the lower one at about 90 degrees Fahrenheit.

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Coleman furnace blower runs continuously


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