The hot water timer is set to come on twice a day for an hour at a time, however it was accidently switched on all night at the weekend. The radiators normally heat up when the hot water is switched but now with the hot water off they are still warm. I have not had the hot water on since Sunday evening and I ran the hot water tap until it went cold but the radiators are still hot, its as though the heating is on even though the timer says its off.