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Programmer is a Drayton MITimer 1720R (7 day hot water and heating). When it's heating only water none of the radiators come on, until the timer finishes its programmed cycle. Then the pump is still going and the radiators get warm. The system has been working fine for the past 8 years.

My gas boiler, a Vaillant ecoTEC plus 415 is doing rather odd and random things. Everytime the boiler is heating hot water for the hot water tank (unvented cylinder) when it finishes the pump continues and pumps the rest of the water around the radiators making the house warm, there is no call...