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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...

Thanks to ChrisR and pannierstan for their advice and quick replies. It is possible that the programmer was not wired in correctly after having my new boiler installed a few months ago. The electrician did make some comment about the wiring being somewhat unusual and said that he would just copy...

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...