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

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Heater flashes 3 times says it means combustion switch failed to close

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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...

Posted on Jan 15, 2009

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SOURCE: my furnace keeps flashing 3

jump out the pressure switch see if it lights some tines you can fool it in to working but this is just a test , try blowing down one of the hoses there may be a blockage take off the hoses and with a small drill bit clean out the conections to the pressure switch , try these see if it works if not you may well need a new pressure switch.

Posted on Sep 16, 2011

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SOURCE: turning heater on : combustion air switch failed to close?

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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Posted on Jan 02, 2017

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1 Answer

Ignition control led 3 flashes


First, make sure that combustion fan comes on and there is nothing obstructing air flow in the combustion chamber. Then, check the tube between the pressure switch and the induction motor to make sure it is connected and not obstructed. Then, replace the pressure switch, part number 60030.

Mar 02, 2014 | Mr. Heater MHU45LP

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

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...

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

My furnace keeps flashing 3 times which says the combustion air switch failed to close what does this mean and what can i do


jump out the pressure switch see if it lights some tines you can fool it in to working but this is just a test , try blowing down one of the hoses there may be a blockage take off the hoses and with a small drill bit clean out the conections to the pressure switch , try these see if it works if not you may well need a new pressure switch.

Sep 16, 2011 | Heating & Cooling

1 Answer

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

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...

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...

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...

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