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Hi, Yes I did measure voltages across the stat terminals and I have 230. I am an electrician so I am quite confident in following the fault flow chart.

Thank for the replys. That was the first thing I checked. External controls are fine, to be 100% I even linked out the terminals. The pump isn't running, there is no power to terminals 15 and 8 on M1 connector (live and neutral) Boiler fires up and pump runs on DHW.

Hi guys, Fired up heating after a long while out of use and it didn't fire up. Going through the f/f process I got far as checking the power to the pump. No power, change pcb. As it happened I had a new pcb for emergencys, fitted this and still the same problem?! Any ideas? Heating...