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Old 03-20-2009, 09:08 PM   #1
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Furnace will not ignite


The model is a Goodman GMP-100-5 Rev B
Unit is 6 years old.
Blower starts but not getting ignition of gas flame.
Tested Limit switch and it is in a closed positon. I believe this indicates that the limit switch is good but I am not sure. If I am correct in my assumption, what could the problem be? Also not getting any blinking lights thru the view window.

Took the lower door off and found the LED light. Turned the unit on, the fan started and I also heard like switch clicked and then smelled gas, all the time the fan is running, click reapeated about 3 times, each time smelling gas with no ignition. The unit shuts off and I have a contionus blinking red light.


Last edited by Home Owner; 03-21-2009 at 11:55 AM. Reason: Update
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Old 03-20-2009, 09:13 PM   #2
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Furnace will not ignite


Does the igniter glow red? Is there a viewing window on the lower door, look inside and see if it has a flashing LED, count it and find the code on the back of one of the doors.

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Old 03-20-2009, 09:32 PM   #3
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Furnace will not ignite


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Does the igniter glow red? Is there a viewing window on the lower door, look inside and see if it has a flashing LED, count it and find the code on the back of one of the doors.
Yuri, No flashing Led, thanks, what else can it be?
Also no igniter glowing red.
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Old 03-20-2009, 09:37 PM   #4
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Furnace will not ignite


Is the LED on?
When the burner goes to start, the ventor fan starts and then the igniter which sits in front of one of the burners glows red hot after about 45 seconds. If it doesn't then it may be burnt out, bad pressure switch, bad circuit board or other problems. There should be an additional spill switch and rollout switch beside the burners and on the ventor fan. If either one is tripped you have a SERIOUS problem. The Goodmans have a bad history of cracked heat exchangers.

Last edited by yuri; 03-20-2009 at 09:46 PM.
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Old 03-20-2009, 11:33 PM   #5
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Furnace will not ignite


You can check the ignitor with a volt meter .turn power off.....check for continuity on the wires coming out of ignitor... .. don't touch ignitor
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Old 03-21-2009, 11:56 AM   #6
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Furnace will not ignite


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Is the LED on?
When the burner goes to start, the ventor fan starts and then the igniter which sits in front of one of the burners glows red hot after about 45 seconds. If it doesn't then it may be burnt out, bad pressure switch, bad circuit board or other problems. There should be an additional spill switch and rollout switch beside the burners and on the ventor fan. If either one is tripped you have a SERIOUS problem. The Goodmans have a bad history of cracked heat exchangers.

Yuri, found the light and it blinks continous.
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Old 03-21-2009, 12:09 PM   #7
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Furnace will not ignite


That means you have power to the board/good. Check for those extra switches, some have a red reset button.
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Old 03-21-2009, 04:10 PM   #8
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Furnace will not ignite


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That means you have power to the board/good. Check for those extra switches, some have a red reset button.

Found the ignitor to be bad, had a crack on it.
Thanks for your help.
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Old 03-21-2009, 04:11 PM   #9
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Furnace will not ignite


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You can check the ignitor with a volt meter .turn power off.....check for continuity on the wires coming out of ignitor... .. don't touch ignitor
Kenmac, right on the money, bad ignitor, thanks.
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Old 03-21-2009, 05:28 PM   #10
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Furnace will not ignite


When installing the new ignitor. try not to touch the carbon part with your hands . they say the oil from your skin will cause them to burn out prematurely
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Old 03-21-2009, 06:06 PM   #11
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Furnace will not ignite


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When installing the new ignitor. try not to touch the carbon part with your hands . they say the oil from your skin will cause them to burn out prematurely
Thanks for the tip. Do you know off any instructional videos on cleaning the unit ?
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Old 03-21-2009, 11:33 PM   #12
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Furnace will not ignite


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Thanks for the tip. Do you know off any instructional videos on cleaning the unit ?


No I don't If it's a 90 % you will just about have to take it apart to clean the lower chamber. The upper chamber isn't bad to clean a little difficult to inspect unless you have a camera or take the blower out
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Old 03-25-2009, 01:42 PM   #13
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Furnace will not ignite


I replaced the ignitor. Also did a cleaning on it. Now the damn unit does not want to start. When I give it power, the red light comes on for 5 seconds then shuts off. Checked the wiring and roll out swiches, all ok.
Any ideas on what my problem could be now ?
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Old 03-25-2009, 02:09 PM   #14
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Furnace will not ignite


"When you give it power?" what do you mean by that? If you are pushing the door switch in and it is weak/bad then it may be faulty.
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Old 03-25-2009, 02:45 PM   #15
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Furnace will not ignite


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"When you give it power?" what do you mean by that? If you are pushing the door switch in and it is weak/bad then it may be faulty.
Man did I just learned a big lesson. Plus I threw in towel too soon. When I removed the wires I had made a schematic so I would know where to reconnect the wiring. I wrote a "B" for blue & "B" for black. So what I did was connect the black where blue was suppose to be & blue where black belongs. What an ******* I am. Anyway I corrected and all's well now.
Lesson learned, write out the whole word instead of just the 1st letter.

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