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    Potterton Promax 33 HE Plus combi - heating on when not selected.

    I have a Potterton Promax 33 HE Plus combi boiler. All appeared to be working fine until a couple of days ago. Hot water only is selected on the boiler front, the boiler heating water temp is turned right down and the roomstat is turned right down. However, when I run hot water the radiators get...
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