Furnace problem.

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Old 10-30-18, 09:12 AM
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Furnace problem.

I am a recently retired HVAC tech yet a bit rusty. I have a Goodman GKS90904CXAE I am working on and am stumped. Someone else already started messing with it so there's that...

Nothing comes on. Of all the tests I have ran all the high voltage is good. 120 at the switch. 120 at the door switch, 120 at the board , 120 at the transformer. No 24 at the board or coming out of the transformer. No LED light. I am thinking transformer or board but want to be sure. Thoughts?
 
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Old 10-30-18, 09:21 AM
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Welcome to the forums.

120vAC going in to the transformer is good.
You need to check for 24vAC coming out of the transformer. If it's not present.... the transformer is bad. You may want to consider adding in a 3-4A fuse if there isn't one on the control board.
 
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Old 10-30-18, 09:28 AM
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There is not 24 coming out of the transformer. The board has a 3 amp fuse and it's good.
 
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Old 10-30-18, 09:34 AM
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Time for a new transformer. Get a 24vAC 40va replacement.
 
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