Question about Goodman GMS90703BXA Heater

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Gmh950904cxac burner on for a few sec.

I just installed this furnace and I get the main burners to light for only about 3 seconds, I tried juming the pressure switch with the two grey wire and still the burners only stay on for a few seconds. The led light stays on steady for normal operation

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My gas furnace has a small to big problem. When the t-stat calls for heat the furnace clicks, The vent motor blower comes on, the ceramic electric igniter comes on, the gas to the burners start to flow then it like misfires" or “burps several times” like gas is there but not enough or something like that, hard to explain". Then the main gas source stops and the vent bower runs back up and ignition glows and tries the cycle again. The furnace then will start this process over and most of the time it takes like 40 times before it fires and 10% of the time runs normal. The light on the controller board (Emerson) stays solid lit. No blinking indicating a problem.

Steps to resolve:

  1. Disconnected the pvc exhaust pip to see if there was any back pressure on the exhaust at that level. – No change in status. Did seem to increase maybe the likely hood of an eventual long burn cycle. It appears that if its going there is a chance that reconnecting it makes the gas flow stop.
  2. Intake removed and the top door opened, this did not seem to have an impact.
  3. Removed the lower door and this seemed to help a little bit but not much. Longer burns to 45 seconds then shut down.
  4. Removed the Gas Flame sensor and cleaned lightly with steal wool and reinstalled. No change in status.
  5. Filed top ground green lug, attached on burner flange assembly. No change in status.
  6. Checked continuity on gas flame sensor wire from sensor to controller. .02 on meter
  7. When open exhaust is present the system definitely works longer. While burner is running lit, slowly place hand on exhaust port and that appears to trip it in the same manner when its fully exhausted.
  8. The two pressure switches are as follows: (35) parts diagram = B1370158
Left side connected to low end of “Flue collector Box Kit” – -0.37 PF SN:20197312 model: 9371VO-HS-0016
Right side connected to 11:am on the “Vent Motor Housing” - 0 95PF SN: 0130F00002P Model: 9371VO-HS-0097

  1. Went to Econotemp ( a local DIY HVAC contractor that allows for the public) and they felt it was being obstructed for exhaust via water accumulation in the Flue Collector box. Further research of similar Goodman manuals, including mine, show that the tan elbow with the orifices for condensation being on the tail extension and not on the upper inside elbow location that was currently hooked up. Disassembled the vent motor from the flue collector box and had about ½ cup of water sitting in the black plastic fan housing. Examination of the tan exhaust condensate assembly reveals a poor design. The drain in a vertical position, likely 95% of the time, should be on the long tail and not on the upper inner elbow. The small upper condensate drain is inter-connected to the long tail inside the tan elbow housing and is not readily visible. This would allow for condensate that comes back down on the center edge of the pipe to catch and the condensate that takes the easiest route of least resistance to go into the long tail. If the water rises in the tail it would have to flow over the spillway into the vent motor housing if it is not drained at the bottom of the leg which has no orifice. Therefore decided to back/re-engineer the drain system with quantity 2 - 1.2 brass barbs - one being male threaded the other female and aviator straps with clear hose to the regular existing drain. Ended with the old black condensate hose not being used. Tested and it did not back fire “burp” once. Further time testing needed to see if condensate stays out of the vent motor housing.

Posted on Oct 29, 2008

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Sounds like a problem with the flame rod. small silver rod that sits by end burner and detects a flame.

Posted on Sep 13, 2008

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Let us know if this helped

Mack B

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I have a downdraft Goodman furnace. On only some occasions the blower will start, then after a few seconds I will see the igniter light up, but then I do not get the rush of gas and lighting of the...

It sounds like you got a tough one there.When you say the blower starts up and then the igniter comes on are you refering to induced draft motor or main blower. The proper sequence is for the thermostat to call for heat at which point the induced draft motor should come on and run for 30-45 seconds,then the igniter should heat up for a few seconds then gas valve should open and main burner should light. After limit switch reaches set point for fan on ,blower should come on till after heat has reached thermostat setting then burner should go out, and blower run until fan off setting is reached on limit switch. If your furnace is not following this sequence and then not always doing the same thing in the same order,I would recommend that you change out board again. I have had several problems similar to this with Goodman units and all but one time installing new board solved it. That time I did everything I knew to do and talked to factory service techs repeatedly and finally installed new furnace. As far as your question about insulation,. As long as it is fire proof I can't see where it would hurt anything. Sorry I'm not more help. Good luck and thanks.

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