I have Baxi Boiler (model unknown at this precise moment in time) which British Gas have fixed up to a seperate control panel (see image - not our actual panel, image from Google!).
The problem is that even with the Central Heating set to off, when we want hot water, either via the timer or setting it manually to "on", all the radiators heat up.
Is an easy to fix problem? Has the control panel been set up incorrectly, or is this a problem with the boiler?