Question about Goodman GMS90703BXA Heater

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

The venter blower, igniter, gas, flame all go on as they should. Then about 5 sec. after the igniter turns off the gas shuts off. I changed the flame sensor thinking that was the problem, but still the same. Any advice welcomed

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  • Anonymous Oct 17, 2008

    having the same problem with goodman gmp-075-3

  • rbrown923 Oct 19, 2008

    I have GMT 70 and the gas shuts off after about 3 minutes of running then `1 minute later it recycles

  • mikem1204 Oct 20, 2008

    I have a GMP 075-3 with the same problem. Unit will cycle on for about 1 few seconds, then turn off, and cycle back on for a few seconds. This repeates for about 5 minutes, then stays off for about 10 minutes and starts back all over. Have not changed out any parts yet, so the wire should still be connected.

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Clean the sensor with a piece of fine sand paper. It gets a coating on it after a few years of service. I had my cleaned for $160, it took five minutes.

Posted on Feb 03, 2009

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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.

Posted on Oct 22, 2008

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Make sure you trace the wire to the flame sensor back to the board and see that it is still connected.

Posted on Oct 11, 2008

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Goodman furnace has 3 blinking lights, indicating pressure switch stuck open. Any help?


The flame sensor needs to be cleaned. This video might help you understand how to clean the flame sensor.

Oct 05, 2012 | Goodman Manufacturing Goodman GMH950704CX...

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I installed a new goodman unit this past spring. It seems to work ok to good in the day time but the tempature is warmer so we do not need as much heat. At night I know the thermostat is coming on. I...


Heating Mode (Goodman Service Manual)

· The furnace control checks for an open main limit (this
limit is normally closed). If the limit is open, the furnace
will remain inoperable until the limit is closed. During
an open limit the circulating air blower will be
energized. The status light will blink four (4) times.
· The room thermostat reacts to a demand for heat.

· The control will then check to insure that the vent
pressure switch is open. If, at this point, the vent
pressure switch is closed the control will blink two (2)
times and will remain inoperable until this situation is
corrected.

· The venter blower is energized.· The vent pressure switch will close when it detects a
pressure in excess of its setting. If the pressure switch
fails to close the status light will flash three (3) times.

The sequence cannot continue until the pressure switch
closes.

· After a pre-purge of about ten (10) seconds the electronic
ignition device will be energized.

· After a slight delay the gas valve will open.

· The burners will ignite and the flame sensor will detect
the presence of flame. The ignition device will
deenergize. If the sensor does not detect the burner
flame, the gas valve will close and the ignition cycle
will be repeated for a total of three attempts. If, after
the third attempt, the presence of flame is not detected,
the furnace will go into a lockout condition for one (1)
hour. It will then repeat the ignition cycle. This one (1)
hour lockout and retry will occur indefinitely.

· Thirty (30) seconds after the main valve is energized
the circulating air blower will be activated.

· The furnace will remain in operation until the demand
for heat is satisfied.

· Once the demand is satisfied the venter will shut off,
and the circulating air blower will shut off after the field
selectable time off is attained.

· The furnace will remain dormant until the next demand
for heat.

Dec 03, 2010 | Goodman GMS80903BNA Heater

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Inductor blower comes on and runs then the ignitor glows flame comes up and burns for approx. 10-15 sec then goes out then fan comes on. Model number is PBKMLB12N0B0F I believe this is a goodman furnace.


I cleaned the sensor that was at the the right further most burner on my Goodman and it worked. got the answer to my problem here at fixya. My burner flame only lasted 5 secs before it shut off. Thanks to all who took the time to send me a response.

Nov 13, 2010 | Goodman Heating & Cooling

1 Answer

I have a goodman furnace model#GMT045-3A. when I turn it on the electronic pilot works fine and the furnace will start and run about 30-45seconds then shut off. I followed the insructions for restart but...


On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Jan 26, 2010 | Goodman Heating & Cooling

1 Answer

My 8 yr old Goodman heater will ignite for 10-20 seconds then cut off, and then attempt over and over. Leaving our 2 bdrm condo cold. It did this last year, and all we had to do was change the filter. I...


Sounds like a flame sensor issue. It may just need to be cleaned. It is located either far right or far left in the burner box and has only one wire going to it. It will be in the flame of the last burner. If the flame can't get to it in a very short time the computer shuts the burner down. Make sure all burners are clean. You can use a can of air if you are careful near the igniter, it is very delicate. Here are some other ideas.
On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Dec 29, 2009 | Goodman Heating & Cooling

2 Answers

Have a Goodman GMT070-3B which the vent motor seems to be sticking. I took apart and cleaned the brushes and reassembled. The furnace will come on only after what seems like the vent motor comes up to...


The whole assembly must be replaced.

The sequence of operation is -

Combustion fan purges the heat exchanger. A pressure switch verifies combustion air fan is running. Usually a 30-45 second purge before the hot surface ignitor glows, or the spark ignition starts.

Gas valve opens after 10-15 seconds and main burners light. Control board monitors for flame and shuts gas valve after 2-3 seconds if main burner does not light.

If burner does not light, some boards repeat this for 3 tries, then locks out and is reset by cycling power.

Air blower comes on after another 30-45 seconds after main burner ignition.

Times may vary based on the specific controller board. A flow chart and timing sequence should be located somewhere on the unit, usually in the fan compartment.

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2 Answers

The exhaust blower starts for about 15 seconds then shuts off. several minutes later, the same thing happens - over and over


goodman furnance the exhaust fan starts, igniter glows hot, all burners lite up & will burn for about a minute and shuts down . I think it senses the room blower does not start so it shuts down.

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Furnace shut off after 3 time flame from pilot


Sounds like you may have a weak or bad flame sensor. If the circuit board does not sense a good flame it will not light the burners. Also if your furnace is 5 yrs or newer it should give you a fault on circuit board in the form of a blinking or a code itself.

Feb 15, 2009 | Goodman GMS90703BXA Heater

1 Answer

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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

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