I cleaned it with compressed air, and now its been running for a day. I cleaned it about a month ago so did not think it would make any difference, but for now it seems to run. The is still 81C but fans are only on half, so not sure how to fix that. Dont really want to cut wires.
looks like you hashboards are okay, but 81 degrees is far from good for lifetime. When i put my S9s in 30 degrees they still don't exceed 75 degrees.
Is there no block on inside/outside air?
No and they have been running at 81C all the time. its like it wants to be 81C, it can just turn up the fans but it don't.