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Coleman direct vent forced air furnace

So It turns on for a few seconds and then turns off again. While its on, it blows warm air just fine and all that its just that it only stays on for 5 seconds at the most.

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  • Towel Jan 30, 2008

    please help I have kids and they are freezing

  • iworkalone Feb 20, 2008

    i have the exact same problem w/ a Coleman furnace in one of my rental units. turns on for a minute then turns off. The unit does NOT appear to have a thermo couple. it has electronic ignition. the diagnostic light is steady green indicating no failures. i read on another forum where someone troubleshot the circuit board to find a cold solder joint. it is NOT the thermostat as i have bypassed it completely & it still cycles. problem started a couple of days ago and all indications point to a thermocouple; on the cover plate it shows a 'thermal rod' (?). going by memory here so it might be called something else. haven't been able to locate one of these on parts suppliers for this furnace. can't afford to replace this thing. any help would be greatly appreciated.

    roberto

  • crlnfenton Dec 07, 2008

    I have replaced the fan switch and the thermostat and still it heats the house then shuts on and off every 5 seconds non stop

  • Anonymous Feb 15, 2009

    I have the Coleman EvCon furnace and my unit does the same thing. Everything starts up fine and then it shuts off 5 seconds later and continues to do so.  It will do so as long as the unit stays on. How do you recommend I fix the problem?

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I am a furnace technician and to solve the problem.You will find on the opposite side of the ignitor their is a flame rod with a wire connected to it.Remove it and clean it with sandpaper and re install it and it should fix the problem.If this is dirty it won't sense ignition and the board thinks that is it introducing raw gas into furnace and it isn't igniting and shuts off as a safety precaution.If you see a blueish tinge on the flame rod you should probably replace it.

Posted on Aug 19, 2008

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Check the flu. It has an outer pipe for fresh intake air and an inner pipe that allows the cumbusted air vent out. If the inner pipe is rusted through it sucks the combusted gas back into the fresh air side and flame dies off due to the lack of oxygen and shuts off the gas valve.

Posted on Jan 01, 2009

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Gas direct vent units such as these (not sure what model you have) typically have a thermocouple, or if the thermostat is mounted away from the unit, a thermopile. Either of these could be defective or in some cases, the valve is bad. Make sure there is no obstruction at the vent outside as well, as this will cause the unit to shut off due to lack of combustion air.

Posted on Feb 04, 2008

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My top elements stay a ornge glow on one side and black on the other side

Posted on Dec 13, 2008

  • rickycline63 Dec 13, 2008

    my top elementts stays a orenge glow on one side and on the other side stays black i would like to no what that means

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First see if the fan even comes on or if the same fan is used for both AC and heat

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Hi,
The problem is withthe venting. Your vent pipe goes out of the house in such a way as to catch the air when it is windy and cause the pressure switch to cut out. The flame may only run for a short time, then shut down and then restart. The heat exchanger never gets hot enough to give you warm air.

Check where the vent pipes exit the house. Try adding on an elbow and turning it so that the wind cannot blow back the pipe. Turning it down towards the ground often is good. Make sure that the exhaust cannot recirculate back to the intake pipe also.
Also check that there is no water build up hanging in a pool where the vent pipe may have sagged a bit. this will make the pressure switch much more sensitive.

I hope that this will help you to solve your problem!

Thanks for using Fixya!!

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