Hi all, I have a Baxi Combi boiler, 10 years old. Recently, when I turn heat on, radiators heat up fine. However if I turn hot water on, I get no hot water, but the radiators go roasting hot, even if the heat is turned off. I have bled all the radiators. I suspect it might be something to do with my pump connected to boiler in airing cupboard. Usually pipes get hot when hot water is on. This no longer happens. I think it may be a pressure problem, but my pump does not display pressure so I have no way of changing/fixing this. FYI I have a grundfos UPS 15-50 pump. I need some ideas please. Thanks everyone.