Question about Carrier XHB123D X/Y Series Heat/Cool Air Conditioner

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Code 7 on coleman furnace

What are the possible causes for no ignition?

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  • Ken Bledsoe May 11, 2010

    Faulty ignitor
    Faulty circuit board
    Faulty pressure switch
    Faulty Gas valve
    Faulty Thermostat
    Faulty transformer

    you get the idea there are a few things that can cause the problem. As the process of lighting the burners have to be satisfied for a safe ignition.


  • Perry Putnam
    Perry Putnam May 11, 2010

    what kind of igniter? Hot surface(glow coil) or spark? Explain step by step what it does.

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Dont forget faulty ground too. But by now I bet hes got this going.

Posted on Mar 30, 2009

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I have an Evcon hot surface ignition furnace and can not get the heat to come on .I set my thermostat on desired temp and starts running,but the blower wont come on,on auto I have to switch to the on...


Troubleshooting and Repair
Furnaces with electronic ignition systems may be much more efficient than their early counterparts, but they do it largely through electronics. However, there are still some troubleshooting you can do but fixing the problems can involve replacement of parts more so than repair or adjustment. PROBLEM: Furnace burner will not ignite
Possible Solution
  • With a Hot Surface Ignition (HSI) system, if a gas hissing sound is heard for about 7-10 seconds and the burners do not ignite, the furnace will go into lockout mode.
  • To reset turn the furnace power switch off and back on and try again. The switch is probably located on the side of the furnace. A reset button may also be found on the solid state controller. If resetting fails again, proceed as follows.
  • Turn off power and gas to the furnace
  • Remove and check hot surface igniter being careful not to touch the heat element. If it is cracked or damaged, replace the igniter.
      PROBLEM: Furnace comes on for 7-10 seconds then turns off Possible Solution:
      • Turn off power and gas to the furnace
      • Remove flame sensor from its bracket. Lightly clean the surface with fine emery cloth and replace.
      • The problem may also lie in a bad ground or the the black and white wires being reversed (reversed polarity) at the junction box or outlet powering the furnace.
      • The electronic ignition control module must ensure current flow through the flame sensor to ground and if the polarity is reversed in the circuit there is no voltage potential and the flame sensor does not work and closes the gas valve.
      • If the black and white wires are connected correctly and the flame still drops out, then the issue may be a bad ground. Using a volt-ohm meter, measure between the white wire and the ground wire to be sure you have no voltage.

Nov 01, 2010 | Air Conditioners

1 Answer

Blower runs on furnace, but not on outside unit.motor is not stuck, turns freely.


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Hi,

Here is a tip about troubleshooting your air conditioner...
There are many things that can cause your air conditioner not to cool…

Air Conditioner Trouble - Review the Possibilities

heatman101

Sep 01, 2010 | Coleman Air Conditioners

1 Answer

The Pilot on my electric furnace will not stay lit, blowing cold air instead of warm. The model is L8T-UH.


Is this a code for us to come over cause electric furnaces dont use a pilot light ha! Ha! (they uses electric heat strips for heat .....but if you want to give away money..........)

Dec 09, 2009 | Coleman Mach 15 Air Conditioner

1 Answer

Coleman Evcon Furnace Model G8T10012UHB11A


you probably have a cracked heat exchanger which is causing the rollout switches to trip.even the tiniest of cracks will cause the fan to blow the flame back into the unit and cause them to trip. check the heat exchanger for even the tiniest of cracks if so replace it. and be sure to have a carbon monoxide alarm in your home.

Oct 25, 2008 | Air Conditioners

1 Answer

Pilot light is out of our coleman 7900 mobile home furnace and we can't get it re-ignited


The thermo couple or the gas valve itself is most likely bad. Cheap enough to start with the thermo couple.

Sep 04, 2008 | Coleman Air Conditioners

3 Answers

I have an coleman evcon furnace when i turn a/c on the outside unit will run but the inside wont run


put the just the fan on turn off the ac and the heat and just fan on make sure the blower motor works cause thats really the only thing you utilize from the furnace in the summer and let me know
then if so does your heat work fine

May 30, 2008 | Air Conditioners

1 Answer

My coleman Evcon model DGATO70BDC 1994 starts up and then locks out. The pilot lights and then furnace runs for maybe 2-5 minutes and all that is still running is the air chamber fan. I am thinking of just...


Does your furnace have an air flow sensor? Blowing out the lowest tube will sometimes clear it and allow your furnace to operate. Lack of differential pressure across the burner will cause a lockout.

May 01, 2008 | Air Conditioners

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