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Thanks D_Hailsham, I did think that this forum was here to help others not to shake their confidence when embarking on a new career in the middle of a recession. Cheers

Thanks for the responses. The boiler is a highflow 400 BF and so the HW dial does not directly act on a pot on the PCB. The HW dial / thermostat is electrically wired to the main PCB via to pink wires to terminal X2, pins 1 and 2. Thansk for the suggestion though. I have now received...

Can an experienced Gas Engineer help please? Newly qualified Gas Installer and my first fault is on a Worcester Highflow 400. The customer reports that very very hot water is coming out of her taps, not scolding, but too hot to put your hands under. First thought, HW Temp Thermostat...