I get a 4 codeon my goodman 100.3

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I have a goodman 100-3 its 15yr old unit [ 1 Answers ]

I replaced the board and worked fine for a day checked everything and I'm not getting 24vt to the gas valve but if I start it normaly and wait for the cycle to run board clicks and I hit it with a wire from the tranformer it works what do I do I need help

Goodman 100-3 no 24vt to gas valve [ 1 Answers ]

I have checked the pressure switch and the igniter it runs normal till the igniter glows red and the board clicks and no 24vt to gas valve but if I hook a wire from the transformer and hit the gas valve it runs fine what is my problem

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Problem is with Goodman 100-3. The ignitor will glow and then go out. It does this 3 times then stops completely. No flames at all. Looking through manual can not find where the circuit board is located. I've been researching online and it states to watch for blinking lights from the circuit board...

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