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Anyone else with any ideas?

Yes the PCB was what I was tending towards after following the fault finding in the instruction manual. From what I've read on these forums PCBs seem to fail worryingly often!

When I run a hot water tap there is no life at all from the pump. The only action I can see is that the diverter pushes onto the microswitch. Pump/fan do not run. If the CH is on and I open a hot tap the boiler shuts down until i close the hot water tap again. Re the intermittent CH. I...

The room stat wires directly into the boiler. No Hot water, and CH only works intermittently now

It only tripped RCD when timer was wired into PCB. Timer disconnected now. Pump runs fine, and boiler fires too, just have no timer control!

I have a Ravenheat CSI85 Combination Boiler. It was installed 4 years ago by a CORGI registered installer. All the rads and pipe-work were new (flat previously had storage heaters). System wash powerflushed and X100 inhibitor added. It is a sealed system. It has an external timer and...