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Old 02-12-2012, 04:40 PM   #1
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Goodman furnace wont light and it is getting cold


Hello all

I have a furnace problem I hope you can help me with.

I have a goodman GMH 95

The thermostat calls for heat

THe furnace has 110v power to the unit

110 v through the door switch whan it is pressed and to the transformer

Transformer is sending out 28 volts to the board and nothing has power beyond that.

The LED on the board is not lit.

Of course this happens on Sunday when I cant get parts.

I think the transformer went bad and burnt up the board? does this sound correct?

I dont have any experience on this model. I was a pro with my old goodman because I had to work on it all the time but this one has been untouched but for filter changes for the 5 years we hav had it in the house.

Any information you have would be appriciated.

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Old 02-12-2012, 04:44 PM   #2
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Goodman furnace wont light and it is getting cold


Check the fuse on the furnace board. Also look for a short on the ow voltage side.

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Old 02-12-2012, 05:05 PM   #3
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Goodman furnace wont light and it is getting cold


List the age & model of the furnace.
How is the fuse on the board??
Was the led light on the board formally lit all the time even when there was no call for heat?
Have you confirmed that the thermostat is actually calling for heat?
Turn off the thermostat and jumper the thermostat leads in the furnace at connections R & W to confirm.
If you think that the board is fried then I'd turn off the power and pull it & carefully check the back of it for scorch marks.
Let us know what you find.

Last edited by how; 02-12-2012 at 05:09 PM.
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Old 02-12-2012, 05:06 PM   #4
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Goodman furnace wont light and it is getting cold


Thanks for the reply.
I forgot to put on that the fuse is not blown,

Where would I check for a short? I cant find power coming out of the board anywhere?

Thanks again for the reply
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Old 02-12-2012, 05:20 PM   #5
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Goodman furnace wont light and it is getting cold


Quote:
Originally Posted by how View Post
List the age & model of the furnace.
the furnace is an 02 but it was not installed until 07 Guess it was sitting in stock somewhere. THe only number I could find on it is GMH950703BXAA
How is the fuse on the board??
Fuse is not blown
Was the led light on the board formally lit all the time even when there was no call for heat?
I think it is on all the time but do not know for sure. The info on the inside of the door says if it is lit solid normal operation, if it is not lit bad control board.
Have you confirmed that the thermostat is actually calling for heat?
The digital thermostat clicks and there is voltage out when it calls for heat.
Turn off the thermostat and jumper the thermostat leads in the furnace at connections R & W to confirm.
I have not done this but I will
If you think that the board is fried then I'd turn off the power and pull it & carefully check the back of it for scorch marks.
OK will do
Let us know what you find.
Thanks for the reply
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Old 02-12-2012, 05:45 PM   #6
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Goodman furnace wont light and it is getting cold


If the fuse is OK and the led is off then you probably have a broken connection in the board and not an active short.
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Old 02-12-2012, 06:35 PM   #7
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Goodman furnace wont light and it is getting cold


Remove the wires from R and W, then wire a jumper across them, and see if it works then. Remember, the panel must be on for it to work, or the safety switch at least held in.
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Old 02-12-2012, 06:40 PM   #8
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Goodman furnace wont light and it is getting cold


You say that you was getting voltage from the transformer low side then fuse is ok. Did you try shut everything off and restart.
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Old 02-13-2012, 07:01 AM   #9
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Goodman furnace wont light and it is getting cold


power in nothing out= bad board

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