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Trying to light the coleman furnace and error flashes says "Combustion air switch failed to close. Have turned circut breaker off and tried to start it several times. Cannot even get it to light.

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Make sure both the exhaust vent and the air intake vent is clear of any obstruction. If the pipes do not pitch back toward furnace, they may have water in them blocking the flow of air. Also check the condensate drain and pump for blockage.

Posted on Oct 03, 2010

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1 Answer

I have a Coleman/Evcon furnace model #DGU08016UB that has a concern. In my attempt to check my furnace before we need it for the winter; the following condition occurred. Condition: Flashing code of...


jump out pressure switch see if it lights check hose to pressure switch see if they are split or connections are not good ,cut off ends and put back on presure switch.

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Coleman combustion air switch failed to close


Hi, new switch can be found on amazon... here: Amazon com Coleman air switch. I hope this was helpful. Cheers

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Have a Evcon Coleman Furnace shows three green blinking lights but will not ignight what could be wrong


I have had the same problem with mine for the last 2 years. Remove the motor on the side of the furnace(usually held on by 3 screws) and turn the fan blades inside by hand. after sitting all summer it seems to get stuck. If it moves freely, replace the motor and try to start it again. This fixed mine the last 2 years! Hope this helped.

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The light indicator says that my combustion air switch failed to close,and i live in a modular home


The combustion air switch is closed by the air pressure from the draft inducer fan. You can check it with a voltmeter. When the heater starts to run check the voltage reading where two wires connect to the switch. It should be 0 vac if the switch is closed. Instead of starting the furnace, you could also remove one end of the rubber hose that goes to it from the draft motor and blow into the hose and see if that closes the switch. It may be just stuck. I almost forgot to mention the most important thing; make sure the draft motor is running. Let me know what you find. The air pressure switch is a safety feature to prevent the furnace from running if there isn't enough air supplied to the burner for proper combustion.

Sep 16, 2010 | Coleman Propane Forced Air Heater...

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Heater flashes 3 times says it means combustion switch failed to close


Combustion switch is your vent safety.. Check your vents outside for blockage, sometimes the intake pipe will freeze or frost up not allowing the preassure switch(vent safety)to close. putting furnace into a lock out.. you can reset the furnace by turning the power on and off.. if there is no power switch just remove the bottom door and reinstall...

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Furnace shuts off


Defective combustion air switch. The 3 blinks are an error code. You didn't say, but I'm guessing you have a Coleman Evcon. They had alot of defective Combustion air switches. Your specialists were not that.

Jan 05, 2009 | Coleman Propane Forced Air Heater...

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I have a red t brand furnace. i think it's part of coleman.


could be bad switch but is the vent free and open of all debris or being blocked by anything

Nov 18, 2008 | Coleman Propane Forced Air Heater...

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Coleman mobile home furnace...Model number DGAA077BDTB...The furnace about a month ago started going out ( flash code- Combustion Air switch stuck closed)We replaced the thermostat on the wall and it...


I had the same errror code on my coleman furnace (3 flashes combustion air switch failed to close) but at first didnt realize there was even a light that gave codes..Anyways long story short, after searching many forums one guy mentioned about the furnace giving a false reading and talked about improper air flow ( coming in and going out) which isnt triggering the switch correctly. After thinking about it and after getting the furnace to run correctly every time I took the door off to tap on the switch (and other spots not knowing what the problem was yet) I always put the door right back on then the furnace would do the same thing (stop running). so I pulled the door off again got the furnace to work properly and left the door off and tested it. It ran great, it started and stopped like normal for a hour and realized I might not be getting proper air flow. Then I remembered I asked my roommate to change my filters for me while I was gone (which he did) and looked at them while I still had the door off and realized the filters were in backwards! which resticted the air flow so much the switch wouldnt operate fully. so check your air filters, something so stupid almost cost me a house visit by the furnace guy....this may not be everyones problem but maybe I will help someone save a house visit....I still cant believe that was my problem and the furnace is still running great.

Mar 14, 2008 | Dishwashers

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