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

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The light indicator says that my combustion air switch failed to close,and i live in a modular home

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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.

Posted on Sep 16, 2010

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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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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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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.

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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.

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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.

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