That time of year again, I expect there is a switch in the timer/programmer, 10 or 16 profiles, 10 is water with heating, 16 is independant (see fitting instructions). Possibly your plumber switched it across, possibly the timer is on its way out, possibly there is another reason.
There is no problem with water 'on' with heating, radiators may take a moment longer to heat up, you may notice you may not, mostly you always want a tank of hot water. Once the tank is hot the 'stat' should/will switch the diverter so all flow is to heating untill the heating 'stat' is 'satisfied' and you are warm.
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