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Thanks for the help folks. Turned out the board was bad. Got lucky in that I replaced the board a year ago, and Johnstones gave me a warranty on it. Had one week left until it was outa warranty!

The thermostat wiring has not been changed. There are no wires on the twin terminal. Is there any other thoughts on the board being bad? Every thing appears to be OK- grounds- A-OK.
Thanks,
John

Thanks for the speedy help. The constant flashing code is incorrect twinning? The cure according to the door panel is to reverse the polarity, which I tried yesterday, to no avail. One thing I did...

When you say they shift fine are they not going into overdrive? If they are slipping you might try some of the purple majic juice at the auto parts store. Has worked for me in the past. If not going...

I have a Goodman Model # GSM100-4 furnace that has been a pain the tail. This week I went to start it up and I am getting a constant flash on the control board. I have an old, what I thought, was a...