Potterton EP2000?

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Hi, i am desperate for some help with my central heating system which is a potterton ep2000. I have set both CH and HW to 24hrs. The problem is that the radiators remain hot even when the thermostat kicks in!! I have even tried switching off CH completely (with HW on 24hrs) and still most radiators remain warm or hot. This is such a pain...and I find myself running around from room to room turing radiators on or off!!! Can someone please help.