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Occasionally all my radiators heat up when DHW is selected on my timer with the result that the water in the hot water tank doesn`t heat up. I can sometimes stop this by turning off the electrical supply to the boiler/timer and reselecting DHW again. I can sometimes go for days without this...

My central heating/hot water system has become very unpredictable and temperamental. I have a new baxi condensing boiler, motorised pump,hot water tank and I presume an open vented system. All the radiators have a habit of heating up when the water should be heating up for the hot water tank...