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Goodman GMT045-3A Furnace. Furnace flue fan always on, glow plug hot, gas ignited, on for 20-30 seconds, click is heard, flame off, glow plug cools. Then cycle repeats over and over again. Sometimes blower comes on. Thermostat on 55, outside temp is 16 degrees. Taken flame sensor out and tried to polish it up. Did not have sand paper. Looks like there may be a crack in flame sensor side. I am thinking about replacing flame sensor as a start.

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Check filter to see if it is plugged. Has someone installed a new thermostat? If so, it may not have been installed properly. Sand off sensor to make it shiny, and be sure all supply and return registers are uncovered.

Posted on Jan 03, 2011

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1 Answer

Burner ignites and goes out (Goodman Gas-fired furnace)


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

Dec 24, 2009 | Goodman GMS90703BXA Heater

2 Answers

Won't ignite


Be sure that that PVC vent pipe going outside is not plugged or trapped with water. If the vent pressure switch is not tripping the furnace will not ignite. Also be sure that you don't have a gas leak somewhere causing weak gas flow to furnace.

Dec 21, 2009 | Goodman GMS90703BXA Heater

1 Answer

Model #GMPN100-4 Goodman furnace. Vent fan


The sequence of events for furnace operation is -

Fan purge for 30-45 seconds. During this time, a pressure switch is actuated by the running of the purge fan, proving the control board the purge fan is running.

After purge and purge prove, the hot surface ignition and or spark begins. After a few second delay, the gas valve will open. The control board then monitors for flame prove through another sensor located near the burners. If there is no flame within 3-5 seconds, the gas valve closes. It will repeat this process, usually 3 times, before it shuts the system down, which requires a power down of the system to reset.

I have seen trash get into the hose between the purge blower and the purge switch. But you could be having other problems.

Dec 17, 2009 | Goodman Heating & Cooling

2 Answers

When I turn my furnace on, the purge blower starts as normal, then after 15 seconds the ignitor starts to glow but when the gas valve should turn on it only turns on for a split second and then you can...


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).

Nov 19, 2009 | Goodman GMS90703BXA Heater

1 Answer

Main Fan won't turn off even with thermostat removed. Burner not


There is a chart with the wiring diagram and othere charts that will tell you what the 6 blinks are for. That should tell you what is wrong and what part you need. Sounds to me like the board has an issue or the gas valve is locked out.

Jan 10, 2009 | Goodman GDS81155CNA Open Flame Mid-Size...

1 Answer

Goodman GMP075-3 ignition problem


bad board,i have had several board failures on goodman

Dec 18, 2008 | Goodman GDS80904BNA Open Flame Heater

2 Answers

Blower works but no heat


If in fact you have the above listed furnace, you do not have a pilot but electronic ignition. You will need to remove the front cover on the furnace, tape down the door safety switch and then have someone help you by turning up your thermostat to a very high setting. Watch and listen inside the furnace. There should be some blinking going on at the control board followed by a small blower fan starting up. Then after 10-15 seconds there should be a click followed by an orange glow viewed thru the viewing window to the burner section. In a few seconds the gas valve should click and the burners will ignite. There is a safety switch that will sense flame and then keep the gas going to the burners. If it does not sense it, it will shut it off within 10 seconds. If all is well so far, your blower will turn on in about 90 seconds after flame. There is a diagnostic code chart on the back side of the access door if you get an error code (blinking) on the control board.

Always check little things like air filter, condensate drain and broken or loose wires.

Nov 05, 2008 | Goodman GMS90703BXA Heater

2 Answers

Ignition failure after three attempts then sits for an hour.


try cleaning the burners and or adjust the distance the igniter is from the actual burner .

Oct 01, 2008 | Goodman GDS80904BNA Open Flame Heater

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