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...
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...