Connection issue
I didn't read the complete thread. The white connector to your green control board gets some minor corrosion on the pins. You need to go to a hardware or automotive store and get some dielectric paste. Unplug the connector and put a small amount on the tip of each pin and then insert the connector several times to wipe the posts. Make sure furnace is not calling for heat when you do this. It has worked for me every time I have an issue with someone's furnace. Once I did have to order and replace the control bd. I now keep a spare.
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