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Cheers for the reply - have unplugged it, seems to be working now as it should. Thought might be the diverter valve or a thermostat, but removing programmer seems to have cured the problem. DHW works on demand, and CH fires up as soon as control knob is turned up, and only then. It's now nice...

Hi Had my boiler virtually rebuilt about a year ago by BG - new heat exchanger, diverted valve, pump. Have an issue starts this morning in that the heating won't turn off. Hot water works really well, no loss of water temp, programmer (electronic, built into boiler fascia) set to off for...