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

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Turning heater on : combustion air switch failed to close?

I live in a trailer and was trying to turn on my heater and when I flipped the switch the light blinks three times which it says means that the combustion air switch failed to close.... how do I fix this?

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I just oiled my switch and made sure that it turned freely and it started working

Posted on Nov 20, 2011

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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.

Posted on Oct 04, 2009

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1 Answer

Furnace won't come on Green lights flashes 3 timesSays Combustion air switch failed to close.


Hello, the switch can fail to close for several reasons. A blocked or restricted flue pipe, water or restriction in small tubing going from pressure switch to inducer motor, weak inducer motor, or the switch itself is bad. Take off the small hose and try blowing through it, sometimes it could just be a small restriction in it.

Sep 16, 2011 | Heating & Cooling

1 Answer

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

Jan 23, 2008 | Goodman GMS90703BXA 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...

1 Answer

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.


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.

Oct 03, 2010 | Coleman Heating & Cooling

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...

4 Answers

Evcon, 3 flashes, combustion air switrch failed to


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 :)

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

1 Answer

The furnace acts like it's going to kick on, but just shuts off..


Make sure there is nothing in the flue or intake air pipe. make sure tubing to the pressure switch is clear and that the combustion blower motor is running. If all these are okay the air switch may be bad.

Oct 04, 2009 | Heating & Cooling

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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