Hi,
Im currently refurbishing a spaform sf100 tub.
so far ive replaced both motors on the wet ends, new senor kit and new filters, filled up turns on and runs perfectly no flo issue at all but when i get upto my set temp it cuts out and triggers the OH code , i reset it runs fine heats up once upto temp same code.
Im thinking of the worse of a pcb fault
thanks steve