Have had same problem for a couple of months now.
Model is Sime Friendly E.
Plumber has changed clock motor twice so problem lies elsewhere. power is routed from circuit board through a cylindrical component on far left-hand-side - looks like a switching relay but circuit diagram is not in standard electrical symbols.
How many visits does it take from a plumber before it is more cost effective to just replace the boiler with a more reliable model from a reliable manufacturer? not many, I guess!
Phil H, February 2008
