I have a Coleman Furnace Echelon 9.M series model FC9M100C16UP11A.

Furnace has 7 red flashes indicating: Lockout due to no ignition. I did some troubleshooting via youtube. I checked the flame sensor and it was dirty so I carefully cleaned it with some very fine steel wool and put it back in the furnace. Started it back up and it attempted to start, the blower is working fine but after a few minutes the furnace shut off and the 7 red flashes started again. I purchased a new flame sensor and replaced the old one but no luck, still getting the 7 red flashes. Then I carefully took out the igniter and checked it for any cracks, there were none. I carefully put it back in and turned furnace back on and watched the igniter through the little window and it came on (glowed) with no problems. I am concerned that it is probably the control board which was replaced with a new one a few years ago.
Any thought on how to troubleshoot the control board? Or any other things I could troubleshoot?
Thanks for any help you can give me...

 

If the igniter glows but the burner doesn't light, then the gas valve is probably not opening. If you have a multimeter, check for 24 volts across the gas valve when the burner should be trying to light (after the igniter is glowing). If you have 24 volts but no gas, then the gas valve may be bad. You can try lightly tapping the valve when it is supposed to open. If you don't have 24 volts then there is a bad connection between board and valve or the board has a problem.

If you hear the gas valve click but the burner isn't lighting, you may have a clogged orifice.

If I misunderstood your post and burner is lighting but going out right away, then that would indicate a problem with the flame sensor or board.

 

Thank you for the info. I will do some troubleshooting that you recommended

 

So I am not very savy in this but the error message 7 red flashes on the control board indicating that there is an ignition lock out. Does that mean the gas has been locked out from allowing the igniter to light the burner? I did tap lightly on what I assume is the gas valve while the igniter was glowing, no luck. Also, I haven't checked the volts for the gas valve, I attached a pic to make sure I am looking at the gas valve as it is really different from the videos I have found on youtube. The lead/plug that connects to it has numerous wires so I am not sure where to probe with the multimeter to check the voltage.

 

I forgot to mention that I can hear the gas valve click. How would I check to see if I may have a clogged orifice and how would I unclog it?

 

You need to watch and address in order what is to happen.

On a call for heat the inducer starts a purge.
After xx seconds the igniter starts to glow.
After xx seconds the burner lights.
After xx seconds the igniter goes out and/or the flame goes out.
Inducer keeps running.

 

That's a modulating gas valve, it doesn't just go on and off, but adjusts gas flow based on how much heat is required.

I don't have any experience with diagnosing problems with them. Perhaps others here will have suggestion on next step.

But just to be clear, per Pete's question, The inducer motor runs and the igniter glows, but most of the time the gas burner never lights, correct?

 

CarbideTipped: In answer to your comment: The inducer motor runs and the igniter glows, but most of the time the gas burner never lights, correct?

Yes that is correct,

 

Did the troubleshooting as far as I felt comfortable and ended up calling a service tech. It ended up being the gas valve. Was a pretty pricey repair but I was at their mercy. We have had really cold weather the past few days
(50 degrees in the house). Now this week it will be in the 70's.
Mother nature you have lousy timing....

 

Thanks for closing the loop and glad you got it fixed. I think most of us here prefer to DIY when possible, but sometimes circumstances give you no choice. Enjoy the coming spring!

 

Have the same issue. The pilot lit and I hear the click but no flames comes out. The only way it turns on is if I slightly knock on the gas pipe, like knocking a door but just slightly. Would the problem would be the valve?

 

It sure sounds like a gas valve issue.