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Old 10-30-2011, 02:56 PM   #1
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Payne pg9maa trouble


I have a payne pg9maa furnace with an issue. When you call for heat, the inducer motor runs thru it's sequence. the igniter glows. the the gas valve opens. I see a blue flame for a few seconds, then I hear a buzz and the flame shuts off and system powers down. It will keep cycling thru this process without locking out. Also, it does not flash a trouble code. So far I have cleaned the filters, cleaned the condensate trap, cleaned the flame sensor, and replaced the pressure switch. Anyone have any ideas?

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Old 10-30-2011, 06:52 PM   #2
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Payne pg9maa trouble


Check for any obstructions to air exhaust and input, usually PVC pipe outside.

If you cleaned flame sensor with sandpaper, you may have ruined it. They are one of the cheap parts to replace. I'd try that.

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Old 10-30-2011, 07:05 PM   #3
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Payne pg9maa trouble


Thanks, I used 000 steel wool on the flame sensor. It doesn't have any scratches or pitting. I will check the exaust. It is on it's third board. If the board is bad could it act this way? Also, what about the gas valve?
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Old 10-30-2011, 07:21 PM   #4
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Payne pg9maa trouble


Check that hose from the inducer draft fan to the pressure switch for any cracks etc, especially at each end. If bad and it's long enough, cut small piece from end and refit.
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Old 10-30-2011, 08:14 PM   #5
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Payne pg9maa trouble


Its interesting that you are not getting any fault code.
A faulty thermostat can cause repeated short cycling that will not give a fault code.
Bypassing the thermostat at the furnace is a worthy test to try.
Repeated board failures also warrants a double checking of all grounds related to the furnace, right back through the electrical shut off & box to the house service.
Although I've questioned this convenient manufactures defence & excuse for repeated board failures, I've also often found poor grounding on those same problem systems.

Last edited by how; 10-31-2011 at 01:04 AM.
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Old 10-31-2011, 07:43 PM   #6
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Payne pg9maa trouble


thanks to all who replied. I replaced the thermostat and that seems to do the trick. Thanks again

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