Basement A/C board:
First, no question about having a clean filter. If it can't get air you got a problem, although a simple fix.
Update on changing the board, for those who care.
Some time ago I was told my problem with the unit not working properly was a board issue and it would cost $400+ to change it. I kept playing with the unit trying to get it to work, but no luck. I read that a regular A/C repairmen could work on it but I called maybe six all passed on the idea (lucky for me because they wouldn't have done any better at it than I did). So, I purchased the board from Airxcel for about $173 including delivery. Somewhere I read that under warranty the mfg would allow one hour for the service. It took me about 3 hours to study the boards, review the instruction, mark all the wires, remove the old board and replace with a new one. The instructions for the new board 6535C320 says it replaces 6 old model boards, must be a substantial improvement?
It now seems to work well, testing in my driveway with the generator. I have not tested it in the field but I think it will be fine now.