Question about Goodman GMS90703BXA Heater

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Goodman modle gmp100-3revb heater ignites and then shuts off.

Replaced sensor that shows there is a flame but it still shuts down.

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  • JDH706 Dec 23, 2008

    I have the same problem with my GMT070-3b

  • Stephen Evans May 11, 2010

    Does either of the doors have about a 2" round inspection window? Steve

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If you are getting ignition but it does not stay on long, check for a bad ground off of the circuit board to the chassis cabinet. Look at the flame sensor and the connection on the circuit board. Is the plug making contact to the board or is there a bent tab? Is the flame spreading from one side of the burners to the others very quickly or slow? If quickly, it has to be either the sensor or the control board. If slowly, clean the burners and the flame spreader.

Posted on Jan 02, 2009

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Goodman furnace furnace starts,flames start and shuts off after 10 sec. Replaced flame sensor still have same problem


if flame sensor is new, the board may not be properly recieving currrent from flame sensor to keep burners on

Feb 05, 2014 | Goodman Heaters

1 Answer

Goodman GMPN860-3 the heater turns on then flame come on for 10 seconds then shuts off .


Hi, this sounds as though your flame sensor is dirty causing the burners to shut down with in a few seconds. The flame sensor plugs into either your circuit board, or ignition module which ever you have. It has a long rather heavy wire, most are orange in color and look like a spark plug wire that lays along side of your automatic pilot. Some are made of porcelain with a metal tip on them that is in the pilot flame. This is what needs to be cleaned. Use a fine piece of sanding cloth or better yet, steel wool. Make it shine. Now try it. If it still shuts down, something else is locking out the module. Get back to me on this, just post a comment for me and I will check in on you. Please rate me on my help to you, and thank you.
Shastalaker7
A/C, & Heating Contractor

Feb 20, 2011 | Goodman GMS90703BXA Heater

1 Answer

The furnance ignites for about ten seconds the right befor the blower comes on the furnance goes out. This repeats itself over and over until the unit shuts itself down.


Take out the flame sensor and clean it with a piece of sand paper or emery cloth and put it back in and this should get sustained flame.2e77348.jpg

Feb 25, 2010 | Goodman GMS90703BXA Heater

1 Answer

My Goodman heater has a problem igniting at times


Hi, I would have to assume your igniter is weak or has a crack in it. Do you see glow from the igniter every time? There is a flame sensor that looks for flame after the gas comes on and it will lockout after three tries, if the flame came on and shut back down every time, it would be problem with that.

Jan 08, 2010 | Goodman Heaters

1 Answer

Goodman gmp125-5 burners ignite, then shut off after about 5 sec


One of two problems are happening here, your flame sensor is bad, your thermo pile or thermo couple is bad, or last is that the cap on the flue is blocking the exhaust from escaping

Feb 08, 2009 | Goodman GDS80904BNA Open Flame Heater

1 Answer

Gas does not stay on.


The unit uses "flame rectification" (basically it is sensing a pulsing dc current) to sense the flame and is very sensitive to bad/poor ground and also to a dirty flame sensor. The gas ignition does not shut off the valve ...the board is not sensing the current thru the flame so its reading a "no Fire" fault and shutting down.

Clean the flame sensor with sandpaper till its brite and shiny and check all connections to make sure they are tight and very clean, especially the ground to the board and also to the furnace itself (sometimes we have to actually drive a ground rod near the furnace itself or use some other means to make sure that a proper gorund is achieved).

If still have a problem; I would try another board, the flame sensor is just a piece of solid stainless alloy wire so its really not necessary to change it unless the ceramic insulator is cracked.

Before you buy another board, I would suggest that you have a pro look at it.

Nov 15, 2008 | Goodman GMS90703BXA Heater

3 Answers

My goodman gmt090-4 shuts off about 10 sec. after burners ignite


Check the pressure sensor. I tapped on mine a few times, removed the hose and checked it for blockage and replaced. It has been working fine since. I do have a new sensor on order.

Oct 04, 2008 | Goodman GMS90703BXA Heater

1 Answer

No heat, trouble shooting light has continious flash.


There is a vacuum sensor on most units tied from the exhaust gas fan to the sensor. Does the unit try to start? If the unit's exhaust fails to pull the switch it will turn off after about 30-45 sec after starting. "IT" thinks it's not exhausting and stops to keep from overheating. Do you have this exhaust fan and rubber hose to sensor? Can you see if that fan is turning on start?

Nov 08, 2007 | Goodman GMS90703BXA Heater

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