I had a goodman gmpn gas furnace that was 1 blink on code. Tested thru circuit and found 24 volts @ gas valve but wouldnt open. I could see it was struggling to open and was certain it was a bad gas valve. I called goodman to verify a few things and told them what i found. He said to try 24 volts strait from transformer as he said sometimes on old units a switch or the board could be sending proper 24 vlt but not proper amperage. I put it direct and the gas valve worked fine. Bypass all swiches and looks like it might be a faulty board. I have never seen this b4. Anytime i had 24 vlt to a valve , motor etc. Yiu would replace itbecause you had voltage proper. Any commentd on thid new find would be good. I am a tech.
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