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After closer inspection of the back of the board I do see some discoloration in 2 spots that might indicate overheating. So is the board the likely culprit as I suspect and what keeps the board from just burning up again if the issue lies somewhere else? If it helps attached are the 2...

yes I really don’t see anything that looks burned at all anywhere in the heater or on the control board.

Yes that is the fuse that is blowing. I have continuity checked every single wire to every sensor from the control board and from the control board to the ICM there are zero signs of wire damage. I have even unplugged all sensors from the control board and left the power from the transfer to...

Yup motor seems to spin very easily.

Moved from here. I am having a similar issue and have a 2007 Mastertemp 400 that worked great never an issue until last season and I got no lights or power to buttons etc. Quickly found fuse blown and replaced which immediately blew when power resupplied. Followed steps in this thread. I do...