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

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I have 3 lights blinking saying that my combustion air switch is not closed. Please help really cold below 0 tonight

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Paul Carew

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Try jumping it out see if it lights , only a temp fix just to get heat .

Posted on Jan 21, 2011

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Joe A H.

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Is the combustion blower motor coming on? Are the intake and the exhaust pipes clear of ice or snow? Are the condensate drain lines open? Not holding any water. is the condensate trap open?
Does the combustion motor sound like its getting up to speed. Is it sound like it is gruggling and have water in it... Make sure the rubber tube from the switch to the combustion motor is clean and the the ports are clean.... After you have checked all of this restart the furnace and listen to see if the sound of the motor has changed. Hope this helps/

Posted on Jan 21, 2011

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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.
Two flashes - combustion air switch stuck closed.
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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Frigidaire Furnace model #FG6RA-096C-16B status light blinks 3 times.


Pressure Switch is Closed with Inducer Off. The inducer will only kick on if the pressure switch is open to initialize the call for heat.

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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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Coleman furnace has green light blinking 3 times. lost manual. What does the code mean?


light blinking 3 times means that your combustion air switch failed to close.

Oct 02, 2010 | Heating & Cooling

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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.

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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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Furnace problems


On - OK
1 Blink - Ignition failure. Check Gas flow, gas pressure, gas valve, flame sensor.
2 Blinks - Closed pressure switch. Check pressure switch (stuck in closed position).
3 Blinks - Pressure switch - failre to close. Check venter, pressure switch, vent blockage.
4 Blinks - Open limit switch. Main limit or aux limit are open. (My comment - Means overheating in chamber. Often result of blocked intake air. Bad filter. In my case, plastic wrap had been sucked into the intake. )
6 Blinks - False flame sensed. Check sticking gas valve.
Rapid continuous blinking - Incorrect twinning, incorrect primary polarity. Reverse transformer secondary leads, reverse primary wires.

Closed pressure switch can be from dirty combustion vents, bad chamber pressure - like missing screws, maladjusted gas pressure, failing pressure switch, loose hoses, moisture in the hoses or fan blades The switch need to be closed to ge the unit to work

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