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Old 01-19-2011, 08:14 PM   #1
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Help needed - Goodman GPG10 burner won't stay lit


I have a Goodman GPG10 2 ton gas pack unit that is 5 years old. On Monday, I replaced my draft inductor motor and fan assembly, as the motor had siezed up over the weekend. The new motor was not a direct replacement, as the original equipment one was discontinued. The replacement was nearly identical, with the only difference being that there was only one power wire instead of the two on the original (208V & 230V)After replacing the draft inductor and hooking everything back up, now the burners won't stay lit.

The system does the normal 15 second purge and the electric ignitor preheat. When the gas valve opens, only the bottom burner (this is a two burner model) lights. After a few seconds, the gas valve closes and the system recycles with another purge and then relights the burners. This second time, the upper burner also lights but as soon as it does and the flame hits the flame sensor, the gas valve shuts off again. This cycle will repeat several times until it finally shuts down completely. Each time the system cycles, the LED indicator on the control board flashes once.

To troubleshoot this, I checked the connections at the control board and sensors and all seemed good. I removed the burner tubes and checked for blockage and none was found. I removed the burner orifices and checked for blockage and none was found. I removed the flame sensor and cleaned it with steel wool. None of these items corrected the problem.

I am wondering if the new draft inductor motor is running at a different RPM, causing the airflow across the burners to be higher, as the flame seems to be pretty intense when it lights. If so, I would assume that the gas pressure would need to be adjusted, which would require a professional.

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Old 01-19-2011, 09:25 PM   #2
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Help needed - Goodman GPG10 burner won't stay lit


clean the burner crossovers and faces and while you are in there clean the flame sensor

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Old 01-19-2011, 09:37 PM   #3
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Help needed - Goodman GPG10 burner won't stay lit


Thanks for the reply. I will do those checks tomorrow, but I am puzzled why the system worked perfectly OK all winter and I only started having the issue after changing the draft inductor motor/fan.
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Old 01-19-2011, 09:50 PM   #4
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Help needed - Goodman GPG10 burner won't stay lit


coincidence?
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Old 01-19-2011, 10:48 PM   #5
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Help needed - Goodman GPG10 burner won't stay lit


Check p 52 here:

http://www.fasco.com/documents/fascopage51-59.pdf
http://www.fasco.com/documents/fascopage22-30.pdf

Hopefully still have old id fan/motor to match up.

Older links: http://www.fasco.com/pdf/p22.pdf
http://www.fasco.com/pdf/p58.pdf

Watch for clockwise and counterclockwise spin.
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Old 01-21-2011, 08:59 PM   #6
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Help needed - Goodman GPG10 burner won't stay lit


I ended up calling a service tech out from the local HVAC company that sells Goodman products. He cleaned and adjusted the burners to get the flame to light consistently. However, it still wouldn't stay lit. It turns out that the control board was bad because it did not sense the flame. I must have damaged it when I was plugging in the new draft inducer motor or maybe it was overloaded when the old motor froze up. I will never know. The important thing is that the heat is back up and running.

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