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Mobile home furnace

Coleman 7900 series propane furnace cycles on and off every 2 minutes

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3 Suggested Answers

  • 70 Answers

SOURCE: Coleman Presidential II mobile home

Is this furnace standing pilot or electronic ignition. If standing pilot i would check furnace filter then the thermastat. To test themostat first turn power off to furnace. Take thermostat off wall and take wires labled R & W and connect them together. If you have electronic ignition I would start with cleaning the flame sensor with steel wool or wire brush.If you have and more questions i will be glad to help.

Posted on Jan 17, 2009

  • 11 Answers

SOURCE: Furnace not cycling properly.

you might want to check the filter, if the filter is restricting the airflow the furnace will over heat and it will shut down. if you turn it off and on it will reset it and it will try again. Pull the filter out half way and try that, if it runs fine then clean the filter or get a less restrictive one.

Posted on Feb 11, 2009

  • 1015 Answers

SOURCE: my coleman 7900 furnace blower cycles on and off

I would look at fan limit switch. They are normally located in electrical cotrol compartment. If your are lucky you will have one thats adjustable. It would helpful if I knew is your home a mobile or modular home as they usually use a button type limit on fan and hi limit. It sounds to me like you may be having problems with fan limit which controls temp. that fan comes on . Often what happens is that switch scenses temp to turn on and then draws cold enough air on return air to shut back down until temp.rises again.If this occurs when unit first comes on or continues after burner shuts off you can get a limit switch with a higher temperature rating or one that has adjustable temperature range. Hope this helps you.Thanks.

Posted on Nov 06, 2010

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1 Answer

Do I need a outside cooling unit for a Coleman 7900 Presidential lll gas heat and cooling unit


Yeah, youd have to look at the model on the Indoor coil box, furnace will be setting on top of it. Youll need the model off that coil box to get the correct tonnage of the outdoor condensing unit, you can go 1/2 ton smaller on outdoor for greater efficiency.

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hi the gas goes along aburner tube then comes out of the burner then it hits a baffle in side the heat exchanger as long as there is not sooting the flame will look yellow , i would say the best thing would be to contact the makers of the furnace direct they should have a technical department , they might be able to offer more help or have there own people to look at the heater most of these companys have a warrenty on there heaters

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1 Answer

Furnace not cycling properly.


you might want to check the filter, if the filter is restricting the airflow the furnace will over heat and it will shut down. if you turn it off and on it will reset it and it will try again. Pull the filter out half way and try that, if it runs fine then clean the filter or get a less restrictive one.

Feb 06, 2009 | Coleman Propane Forced Air Heater...

1 Answer

Need replacement glass for pilot cover of Coleman Presidential II


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Coleman Presidential II mobile home furnace. When burner lights the blower cycles on and off instead of blowing constant through burner cycle.


Is this furnace standing pilot or electronic ignition. If standing pilot i would check furnace filter then the thermastat. To test themostat first turn power off to furnace. Take thermostat off wall and take wires labled R & W and connect them together. If you have electronic ignition I would start with cleaning the flame sensor with steel wool or wire brush.If you have and more questions i will be glad to help.

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There are a few reasons why your furnace is restarting after it reaches temp. and shuts off. First, if you have a mercury bulb thermostat it needs to be level and the heat anticipator needs set properly. If you have an electronic thermostat then you need to make sure the DIP switch settings inside are set properly for propane. If you have a digital thermostat there are also settings to be made for your type of heating. These settings will be explained in the thermostat installation instructions. Also, Make sure your furnace filter is clean. If this does not help then there are some other things to check which may need to be done by a technician depending on your mechanical aptitude. Hope this helps!

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Pilot light is out of our coleman 7900 mobile home furnace and we can't get it re-ignited


The thermo couple or the gas valve itself is most likely bad. Cheap enough to start with the thermo couple.

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1 Answer

Mobile home furnace


you probably have a bad thermostat if it wont shut down id replace the thermostat first and then have the thermocoupler checked...replace the thermostat

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