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My GOODMAN furnace GMH80703ANAA Starts but quits 5 seconds later

My furnace is only 2 years old. It worked fine untill 2 days ago. Now it tries to start, the ignitor glows to a orange color,then the gas comes on for about 2 seconds and burns then everything stops except the fan and the whole cycle starts again. It will cycle several times like this and then stop for a while and start the prosses over.
Thank you for any help I can get, it's Sunday and cold here in Minnesota.

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  • 96 Answers

You have a flame sensor that may just need cleaning take out and take fine sand paper or emery cloth and clean

Posted on Nov 30, 2008

  • 1 more comment 
  • wfk1212 Oct 04, 2010

    dwk guru - you da man... I had the same issue and took some cheese cloth, wiped it down and fired it up. Seems to have done the trick. Thank you very much, Truly.

  • mito0 Jan 23, 2011

    great advice, dwkcool!
    a light sanding on the sensor did the trick.
    for those unfamiliar with this part, it looks like a long spark plug hanging down behind the burner on the far left.
    it's held in with a single screw.
    this took 2 minutes and saved me plenty of money on a wasted service call.
    thanks!

  • tdietz09
    tdietz09 Nov 25, 2012

    Worked for me as well. Thanks for the advice.

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1 Answer

Gas does not ignite on furnace. Fan stays on even when shut off at thermostat. When trying to start, I hear a click and get a gas odor that stops quickly. Furnace had major overhaul 10 years ago.


You have a ignitor problem .Replace the ignitor .Is it a direct spark or a glow type .My guess it's a glow type .About the fan issue sometimes fan would stay running for maybe a minute even after you turn the fan mode ofg

May 27, 2017 | Heating & Cooling

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My furnace is 4 years old. It cycles but does not ignite


More info is needed.
When you say it "Cycles", where does that fall into the following sequence....
1. Call for heat
2. Inducer starts(exhaust)
3. Pressure switch closes( connected to inducer via hose)
4. Ignitor glows or sparks
5. Gas valve opens and burners light
Does the ignitor glow or spark at all?
Do you see the exhaust working?
Sometimes the small hose that runs from the exhaust housing to the pressure switch will get clogged. Blow it out and don't forget the inlet and outlet.

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Furnace begins the process of starting up then 5 seconds later it turns off. It does this repeatedly, sometimes for like an hour then it works fine.


Easy fix. Furnace is not getting confirmation of ignition. Remove the flame sensor and clean it with sand paper. re-install it and retry as seen in this video:

Oct 26, 2012 | Goodman Heating & Cooling

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Problem with Goodman furnace electric ignition


Power is there, or no lights would blink. Steady blinking or flashing three times, stop, three times Etc

Nov 23, 2011 | Goodman Heating & Cooling

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For some reason the heater does not generate heat. the fan works but no heat. Any Ideas?


I've got an easy way for you to check, and then we can help you from there.
First pop open both lids to your furnace (this may require a screwdriver). Turn up your thermostat, push the safety interlock button in if it has one (it's a button that turns off the power when the doors are removed), and watch.

On most modern furnaces (past 20-25 years) you'll hear/see:
1. Inducer fan
2. orange glow (ignitor)
3. Gas valve opening and ignition (flames)
4. Main Fan.

that's normal heater operation.
The most common issue here is a burned out ignitor, in which case you wouldn't see the orange glow but the sequence would attempt to continue anyway (the gas valve will open and hiss gas, but it won't lite, then it'll give up and try again a few minutes later).

On older furnaces there's a pilot light to start with, the click of the gas valve and boom... ignition.

On new furnaces it's
Inducer fan
gas valve opening
spark - ignition
Main fan.

and there are some oddballs in between, particularly the Lennox Pulse. If that's your furnace just back away slowly and call a professional... some guys won't even touch those, so be sure to mention what it is... if you call a pro.

So go ahead and watch it run, then tell me/us what you see.

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1 Answer

Furnace starts up blower starts..nothing ignites...then shuts down. repeats and doesnt stop...sanded igniter stick and nothing happend. flashes red once.


Do you see the actual ignitor glow? You must be saying that you sanded the sensor. The ignitor, after the little inducer fan comes on will begin to glow a bright orange until the burner lights. If the ignitor is broken, you will NOT see a glow, and you may smell a faint smell of gas.

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Why heater coils glow?


It sounds like you're describing one of two things. The hot surface ignitor in a gas-fired furnace, or the resistive heat strips in an electric furnace.

The hot surface ignitor in a gas-fired furnace lights the burners. This ignitor in modern furnaces serves the same purpose as the standing pilot flame did in older furnaces. It provides the required heat to ignite the gas at the burners. Without an ignition source, a gas-fired furnace cannot provide heat. When the ignitor is activated it will glow bright orange or yellow.

The resistive heat strips in an electric furnace actually provide the heat to a home or building. When the furnace turns on, the heat strips are activated and usually glow orange when they reach peak temperature. In almost all cases, the heat strips are not easily seen or accessed without removing covers or panels inside the furnace.

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it would sound like the pressure switch is not working you can take off ther tubes and by hand put a small drill bit in the and clean the switch , some times this works , on some you can jump out the switch and try and fool it in too working

Jan 08, 2011 | Goodman Heating & Cooling

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