I have an overheat fault that I cannot cure . Tested all sensors and switches and think it may be the Controller board . Any Idea's or details on the drawing for the following board . Also has anyone out there have a spare for sale , Dont want to buy a new one as I plan to get shot of this poor boiler . Details below if anyone can help ..Oh its cold

RAVENHEAT TECH-0904 LS80/LS100
0012CIR09005/1

Glenn1410, February 2009