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Apologies.... I can set the control unit to turn on and off at specific times and the red light indicator does come on but the boiler does not kick in. Likewise with the 'advance' button - the red light does come on when the button is pressed but the boiler does not respond.The only way I can...

12 months ago I had to replace my 3 way motorised valve as it was faulty. That did cure the problem at the time but I have since had another issue. I have a Halstead Best 40 Boiler, Lifestyle Thermostat and Lifestyle LP522 control unit. I can set the control unit to switch the HW on and it...