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Code is flashing on my Coleman Furnace ...Combustion air switch failed to close...we have already replaced the pressure switch ....What else could it be???

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Safety limit switch,or some people call them a firestat,it has a red reset button in the middle,located in the return with two wires connected to it,detects heat

Posted on Nov 16, 2008

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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.

Sep 21, 2011 | Coleman Heating & Cooling

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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

Nov 24, 2010 | Coleman Propane Forced Air Heater...

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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.

Sep 29, 2010 | Coleman Propane Forced Air Heater...

1 Answer

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...

1 Answer

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...

Jan 08, 2009 | Coleman Propane Forced Air Heater...

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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...

1 Answer

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...

2 Answers

Have a coleman evcon furnace model DGATO56BDD. blink code flashes 3 times with no diagram to know what the problem is. the furnace blows cool are instead of warm.


Your centrifical swith is stuck open on your blend motor. I found that removing the blend motor housing and spinning the stuck motor (from setting over the summer) will get you out of a bind ,.but you may end up needing this centrifical switch (locatedon the bottom of the blend/fresh air intake) motor replaced.

Oct 02, 2008 | Heating & Cooling

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