The call for heat is active. Inducer motor comes on. Ignitor begins to glow. Burners light. Flame is active for about 10-15 seconds. Flame goes out and blower motor begins to run. It tries to repeat ignition several times before locking out. No fault codes are present.
I have taken several steps in diagnosing this issue. First I verified that the call for heat was consistent by using my meter. Checked the call at the gas valve. Call would stop when burners go out. Checked safeties. Thought it could be a control board issue since no faults were present. Replaced the control board and still had the same problem. Flame sensor is good. During this process I was hearing a click in the pressure switch. I jumped out the pressure switch and the furnace would run. While unit is running I checked continuity of the switch. Continuity will break about every 10-12 seconds for just a fraction of a second. Changed pressure switch and problem still exists. Checked drain lines and they are clear. I truly believe that this problem is caused somewhere within the exhaust system of the furnace but i am running out of ideas. When outside with furnace running I can hear a gurgling sound coming from the exhaust. Please help. This is a 2 year old Goodman unit
Hi,
The problem you have is water in the exhaust pipe.
Check to see if the pipe has sagged anywhere or if there is a trap in the line.
If you hear gurgling then it is definetly water....
Some times can be hard to find, even a pipe 1/4 full will cause problems. They are very sensitive to flue problems.
Make sure that the flue pipe either runs back to the furnace or out to the outside, a continuos slope either way witha high spot in the middle.
Also check the bottom drain of the blower if it has one, have had them plug and trap water also..
I hope that this will help you to solve your problem!
Thanks for using Fixya!!
Heatman101
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