Question about Coleman Propane Forced Air Heater w/Electronic Ignition (50,000-80,000 BTU)

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Evcon, 3 flashes, combustion air switrch failed to

Evcon furnace, 3 flashes, combustion air switrch failed to close, how do I fix it.

Posted by blesstk on

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Sheila Whittaker

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I have 2 of these furnaces in mobile homes I own. On both of these the wheel inside the draft inducer blower that has the clear tube attached to it has a small wheel in it that over time tends to stick. Take the 4 screws out and give this little wheel located towards the bottom a push. Your problem may be solved without investing in expensive parts :)

Posted on Sep 18, 2012

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  • vickilord
    vickilord Oct 05, 2012

    Thought my problem was pressure switch too, installed a new one and still got same message. I took out the screws and gave the wheel a push and then tried it again. That was all it was, thanks.

  • vickilord
    vickilord Oct 05, 2012

    I thought my problem was the pressure switch too, but replaced it and still didn't work. I tried your solution and works great. Thanks.

  • scottauld30
    scottauld30 Oct 09, 2012

    think u so much saved a lot of money

  • Sheila Whittaker
    Sheila Whittaker Feb 08, 2018

    My 1998 still needs this done at beginning of winter..and this is 2018..we all get a little stiff as we age..LOL

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birdine cole

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Take the switch off and clean it really good and make sure that it turns freely that is how i fixed mine

Posted on Nov 20, 2011

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Mike

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Check the hoses from the switch, and the nipples to make sure they are not clogged. Also check for leaks on the booster motor cover, they tend to get brittle and crack.You could also have a leak where the booster assembly connects to the draft pipe.

Posted on Nov 19, 2011

Paul Carew

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Hi take it you mean the pressure switch then you must change it you cannot fix them only replace

Posted on Jan 26, 2010

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1 Answer

I have a coleman/evcon model DGAT070bdf I have the thermostat set at 74 but furnace is shutting off at about 64 degrees I did notice that the mother board's green led light is blinking 4 times.


Steady light on - normal operation.
One flash - ignition failure.
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Three flashes - combustion air switch failed to close.
Four flashes - limit switch open.
Five flashes - gas valve energized with no call for heat.
Rapid flashing - reversed polarity.

Note: Color of light is green.

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Indicator blicks 3 times replaced combustion air switch but did not resolve problem. what do i do now?


There should be a diagnostic chart on the furnace door by the wiring schematic. If so see what the code reads for three blinks.
By the term "air combustion switch" I guess you are referring to the pressure switch. Most diagnostics blinking three times is just a dirty flame sensor. If this is the case the burners will light and go out within 4 seconds. If this is the problem carefully remove the flame sensor and clean gently with emery cloth, fine sandpaper or fine steel wool. Reinsert the sensor and enjoy your heat.

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Have to know the model and serial of the furnace.
locate code list usually inside or on the back of a door.
Operation sequence= call for heat--inducer blower motor--makes pressure switch--signals board to bring on hsi--after a set time gas valve opens and you have ignition--main blower motor comes on after a set time

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there should be a diagnostic code that will tell you what 3 blinks mean for that model. look on door inside cover. tell me EXACTLY what it does at start up. small draft motor comes on? you see a glow from hot surface ignighter? gas comes on? flame on? it should run in this order.

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Combustion Air Switch Failed to Close


I have this furnace in two of my mobile homes. In both I had to take off the inducer motor (i think that's what it's called)..it has the clear air tube attached to it. Remove the 4 screws or top two if you have small fingers and give the wheel inside at the bottom a push. These tend to stick over years of use and in both cases once freed the furnace came on. I too had 3 flashes in both cases.

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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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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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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.

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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.

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