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Old 11-03-2012, 09:13 PM   #1
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Strange problem....just FYI


I got a strange problem today on a Goodman GME80905CX. Blower motor and Induce draft motor are constantly running even with Tstat off or the wires disconnected. Time to replace the controller board.

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Old 11-03-2012, 09:23 PM   #2
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Strange problem....just FYI


Some Goodmans have the limit control in series with the gas valve not the transformer so you may have an open limit or rollout switch. Is that a mid or high efficiency unit? Won't always give or read the proper code when they are in series. Constant running fan is usually an open high limit. Bad grounding of the board killed a lot of their boards a while back.

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Old 11-03-2012, 10:32 PM   #3
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Strange problem....just FYI


Hey Yuri, It's nice see you again. Yes, there is a limit control in series with gas valve. I checked the rollout switch and high limit. I'm not getting any voltage on R at controller board.
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Old 11-04-2012, 01:30 AM   #4
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Strange problem....just FYI


http://www.goodmanmfg.com/Portals/0/...s/IO-GMH95.pdf

Looks like a shorted flame sensor will run both fans. Any trouble codes displayed?

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Old 11-04-2012, 01:52 AM   #5
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Strange problem....just FYI


6 flashes...I checked for shorts, etc.....I stopped the troubleshooting when I measured 0V on R. Next week I'll have a controller board on hand, also I'll check the flame sensor first.
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Old 11-04-2012, 09:34 AM   #6
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Strange problem....just FYI


Did you check the output from the transformer? Getting 24 volts there? Hate to state the obvious. Sounds like the board is bad as with a dead transformer usually nothing happens at all.
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Old 11-04-2012, 12:28 PM   #7
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Strange problem....just FYI


Yes, I did check it. I didn't check the aux limit switch that one it is connected in series with the gas valve.

With the wires from tstat disconnected, when I close the door switch, I hear the relay click to power the blower motor and also the induce started running at the same time.
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Old 11-07-2012, 07:44 PM   #8
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Strange problem....just FYI


Ok, today I replaced the control board. It fixed the problem.

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