diagram for potterton suprima 60?

They do that a lot - boiler engineers - not comfortable with basic electronics - no surprise really.

Take a picture with a digital camera for confidence on reassembly.

Check out this interesting link (slightly related) and consider replacing the electrolytic caps...

http://kaijaks.co.uk/blog/nick/2008/02/10/dodgy-old-boiler

Good luck...

Peccavi
December 2009