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Posted on Nov 30, 2009
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Combustion air switch stuck closed - Coleman Propane Forced Air Heater w/Electronic Ignition (50,000-80,000 BTU)

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5 Related Answers

Anonymous

  • 674 Answers
  • Posted on Sep 16, 2010

SOURCE: the light indicator says that

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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Dan Webster

  • 8221 Answers
  • Posted on Nov 02, 2010

SOURCE: combustion air switch failed to

The combustion fan commonly known in the HVAC world as the Draft Inducer has a tube between the fan and the proving switch. The SUCTION from the fan is what causes the switch to trip and verify to the main board the inducer is up and going. Take that rubber hose off and check for obstructions between the two components. This video show basic furnace operation:


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Anonymous

  • 77 Answers
  • Posted on Nov 24, 2010

SOURCE: coleman combustion air switch failed

If the vacuum switch did not pull in first look to make sure there are no restrictions in the vent pipe if the vent pipe is real long try disconnecting it from the furnace then try to run the furnace again. If that's not it take the rubber hose loose from the combustion blower and **** on it see if the switch itself is bad. If the vent is cleaned out and the vacuum switch sucks in with little effort then your combustion blower in not pulling the proper CFM (cubic feet per minute) and needs to be replaced.

Anonymous

  • 2 Answers
  • Posted on Nov 20, 2011

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

Anonymous

  • 2 Answers
  • Posted on Nov 20, 2011

SOURCE: Evcon, 3 flashes, combustion air switrch failed to

take the switch off and clean it really good and make sure that it turns freely that is how i fixed mine

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Related Questions:

0helpful
1answer

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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Oct 14, 2018 • Heating & Cooling
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I have a woodmaster 5500. The water temp is set at 180 for the high and 160 to turn on the fan control. Now my stove is running up to 212 on aveage before it turns the damper fan off????
Sounds like the differential control (combustion air fan thermostat) that cycles the combustion air fan is stuck closed and the safety circuit opens at 212 degrees to shut off the combustion air fan due to overtemp conditions as the two are probably wired in series.
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Mar 10, 2015 • WoodMaster 5500 Super Duty Wood Furnace
1helpful
1answer

My furnace is giving me the code combustion air switch is stuck close...i tried blowing on the rubber hose the model is a coleman dgaa070bta it wont stay on the small solonoid is clicking
Hi,
The pressure switch has gone bad and will need to be replaced... you can not jumper them out either...
Here is a tip that will help you try to figure out why yourfurnace is not working.

BasicFurnace or Heating System Troubleshooting

heatman101
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Apr 21, 2011 • Heating & Cooling
0helpful
1answer

When i try to turn on the furnance it will not come on. The light flashes twice and that says my combustion air switch is stuck closed how do i fix that.
sounds like you dont have a draft inducer motor operating or the controls for it arent working.
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Feb 20, 2011 • Heating & Cooling
0helpful
1answer

30roof top unit combustion blower comes on but does not ignite ignitors are new
Hi, when the combustion motor comes on, it should or will have a poly type tube on this motor that runs over to a pressure switch. This switch is where the other end of the hose connects. These switches get stuck open at times and have to be broke free by removing one end of the tube and blowing through it. This is a silver looking switch, could be different, but the contact in this switch will stick open causing the unit not to fire up. There is a sequence of operation on these units, 1st the combustion motor will pressurize the box and send pressure to the switch which closes. Once the switch closes, it will send 24 volts to the ignitor module to open the main gas vale to fire the burners. This is just one of several safety switches. This will solve your problem. You can also check this switch by jumping across it with a piece of insulated wire from terminal to terminal. It will fire right up.
Sincerely,
Shastalaker7
A/C, & Heating Contractor
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Jan 07, 2011 • Heating & Cooling
9helpful
1answer

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.
Read full answer
Sep 16, 2010 • Coleman Propane Forced Air Heater...
0helpful
1answer

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.
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Oct 04, 2009 • Heating & Cooling
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2answers

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.
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Oct 03, 2009 • Coleman Propane Forced Air Heater...
0helpful
1answer

I have a coleman/evcon electric ignition lp furnace. I get error cede combustion air switch stuck closed even after replacing the combustion air switch.
Have you tried to replace pressure switch for the combustion air. If your not sure where to find it if you pull the front panels off follow the flue pipe down to combustion chamber the combustion fan motor is either inside the flue pipe or out side of it not sure on the one you have but you should see two plastic tubes that connect to a barb onto the topside of the fan and one on the bottom they both should go back to the pressure switch. i hope this helps you if you have any more question or if this doesnt fix the problem just reply back to this message . Make sure fan is working when furnace starts up. It should be the first thing that comes on when there is a call for heat
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Jan 20, 2009 • Coleman Propane Forced Air Heater...
0helpful
1answer

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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Jan 23, 2008 • Goodman GMS90703BXA Heater
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Propane Forced Air Heater w/Electronic Ignition (50,000-80,000 BTU)

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Related Question

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.

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