Have not experienced a similarv problem, but reading about those whom have, it might be that the Board mis damaged. Possibly the ouput chips?

I believe that the original board was up graded, and that US made boards were superior to Chinese ones

There used to be a chap who would repair boards for a lot less than the price of a replacement.

If you choose to buy a new board, do check which one you have. I believe that the C2 and C3 use different boards.  (Check the nSArc Euro webslite)  It would be a pity to spend a lot of money on a new board and then blow it because it is not the right one mfor the motor fitted.

Howard

Posted this on your other thread, just to be complete

If you want a new motor, talk to Arc Euro, but check which control board and motor. The C2 differs from the C3

HTH

Howard

On the one you have sold, what was the long handel coming out of the gear cover, top left, for?

Keith