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The boiler has never been serviced in it's nine years! Oops. But I don't think a broken knob is the reason the CH is always on, as the CH timer is in the constantly off position, and the knob does correctly turn the boiler off. Also, the temperature reading is around 75 deg even if the...

Thanks Tony. Some more info I forgot... HW works fine, except when taking shower the water goes cold every 2 mins for around 20 secs. As a separate issue, since new the boiler has fired up every 30 mins or so for 60 secs, then turned off again. From browsing this site it seems this...

Hi, Whenever my boiler is powered on the CH is on, regardless of any control panel switch or dial settings. The temperature display shows approx 75deg, with no error codes. I'm living by turning it off at the mains except when I need hot water. Any ideas? Cheers. Paul