Rog, that is seriously fantastic work. I did start to try and do the same but bottled it in the end as I got my circuit board working for a while.
Gordon, I posted on here about fixing a similar issue with mine on the fan speed 2 blowing fuses. In my case it was failure of the small fly back diodes that dump the current from back emf when the relays switch off. They fail by shorting out. It was a simple case of replacing them with bog standard diodes. I'll see if I can find the thread.
Cheers
Nick
