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Looking on another site (diyfixit.co.uk) I found:- --------- Warm radiators upstairs when the heating is off, and hot water is on If this happens, it is probably because the check valve on a gravity fed system has failed. In a gravity fed system, the hot water cylinder is heated by water...

Hello, I recently moved into a victorian house that has had gas central heating fitted some years in the past. Now it's summer, I've switched off the heating side of it (but hot water still on obviously) to find that one of the radiators still gets piping hot (when the hot water is on) and...