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Code is flashing on my Coleman Furnace ...Combustion air switch failed to close...we have already replaced the pressure switch ....What else could it be???

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Safety limit switch,or some people call them a firestat,it has a red reset button in the middle,located in the return with two wires connected to it,detects heat

Posted on Nov 16, 2008

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1 Answer

Furnace will not ignite.


I think you are talking about draft induction pressure switch operation. Make sure the metal orifice located on the draft induction blower is clear. To check, remove the rubber tubing end at the pressure switch and blow into the tubing. It should be easy to blow through it. If it is plugged, remove the tubing from the blower orfice and use a paperclip, inserting it into the orfice to clear the opening. After repairing, and all is hooked up, retry the furnace start up procedure. If the code comes up again, replace the pressure switch.

Dec 17, 2014 | Goodman Manufacturing...

1 Answer

Just replaced pressure switch on intertherm m1mb gas furnace but still codes "pressure switch open"


CHECK FLUE FOR OBSTUCTIONS AS WELL AS COMBUSTION AIR INTAKE FIRST. THEN CHECK TO SEE IF THE FURNACE DRAIN IS OPEN AND NOT CLOGGED [ONLY IF YOUR FURNACE IS A CONDENSATING HIGH EFFICIENCY MODEL, typically the flue pipe will be 2 or 3 inch pvc pipe] over the years more often than not, it is an obstruction or poor drainage which will not prove the pressure switch to allow the burner to ignite. in rare cases the furnace control board could be bad as well.TRY DISCONNECTING FLUE AND COMB. AIR AT FURNACE JUST TO SEE IF FURNACE WILL IGNITE. HOPE THIS HELPS!!!!!!

Oct 20, 2011 | Intertherm P3RA-048K Air Conditioner

1 Answer

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

Apr 21, 2011 | Heating & Cooling

1 Answer

Our furnace wont blow heat. status code is 1 short dash 4 long dashes.. please help!!!!


Hello, this code means that the pressure switch is closed and wont allow the furnace to run. Sometimes the contacts on the pressure switch weld closed or the switch itself will go bad and must be replaced.

Jan 27, 2011 | Heating & Cooling

1 Answer

My furnace is flashing 21 green and then it flashes red ...the furance will not run . I have replaced the thermostat and cleaned tha condensate drain


not sure what 21 is ,but if you are getting acode normally the code comments are on the door or the manufacture lable to tell you what they are...
i can tell you the operation and maybe that will help you out...
the unit should start off with the enducer draft motor small motor in furnace that pulls all the stale air out..then the negative pressure switch activates which should have a hose coming from the enducer draft moto to the pressure switch..once the pressure switch closes it sends power to the ignitor and the ignitor should glow once it gets hot a milivolt current is sent back to the gas valve and it opens up and fires...after it fires you should have a flame sensor small metal rod in the direct path of flame that keep sensing the flame and sends signal back to board.... unplug unit and watch it start where is it failing or in what part of the operation does it flash a code....

Jan 03, 2011 | American Standard Heating & Cooling

1 Answer

My furnace isnt working the trouble light code says pressure switch stuck open or closed


The pressure switch, open or closed depends on the induce fan motor. the switch could of failed. Try blowing into it, in and out. And or your induce fan motor is not blowing out the excessive heat out of the furnace properly. We provide repairs in the So Cal Area.

Oct 07, 2010 | 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

1 Answer

Combustion blower turns on and never stops running


Sounds to me like the furnace isn't getting enough fresh air for combustion and the pressure switch isn't closing. try taking the cover off the burner assembly and c if that works

Mar 09, 2009 | Carrier Heating & Cooling

2 Answers

Have a coleman evcon furnace model DGATO56BDD. blink code flashes 3 times with no diagram to know what the problem is. the furnace blows cool are instead of warm.


Your centrifical swith is stuck open on your blend motor. I found that removing the blend motor housing and spinning the stuck motor (from setting over the summer) will get you out of a bind ,.but you may end up needing this centrifical switch (locatedon the bottom of the blend/fresh air intake) motor replaced.

Oct 02, 2008 | Heating & Cooling

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