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

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Coleman furnace(propane) will not start and I get a code three(combustion air switch failed to close. any quick fix

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Change presure switch , no quick fix

Posted on Sep 17, 2010

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1 Answer

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.

May 09, 2012 | Coleman Propane Forced Air Heater...

2 Answers

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...

3 Answers

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

Flash code indicates that the combustion air switch failed to close....how do I fix it


First, make sure that the draft inducer motor is running. Then check all tubing inside your furnace and ensure there are no kinks, moisture buildup, or cracks.......repair as necessary. Also make sure there are no blockages in your exhaust pipe.

If, after doing these three items, you continue to have a problem, let us know and we'll dig a little deeper. But 99% of the time, your problem is in one of these three areas. :-)

I hope you find this to be very helpful. :-)

Mar 26, 2010 | Coleman Propane Forced Air Heater...

3 Answers

My Colman forced air heater is cycling acording to the thrmastat but wont heat up. The trouble shooting light flashes three times.What part do you think is failing?


3 flashes is the combustion pressure switch . Mounted on the front mid high. Two silicone hoses run to it along with blue two wires. By now you have probaly got this fixed though.

Nov 16, 2009 | Coleman Propane Forced Air Heater...

2 Answers

Turning heater on : combustion air switch failed to close?


This air switch proves that the inducer motor is running and moving air. If not, check to make sure that the inducer motor starts and that the flue is free of restrictions.....eg. bird nest, ice/snow, or some other critter that found a new home.

Oct 03, 2009 | 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...

2 Answers

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...

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