We've just got the keys back to our house, after a couple of years in a camper van whilst friends lived here. We've noticed something very strange has happened with the boiler - the hot water's coming through FAR too fast, so it's running cold. If you turn the tap way down, the flow comes back to where it always used to be, and the temperature gets back to hot.
It's a Worcester Bosch 24CDi Combi, just prior to condensing taking over. A couple of years ago, a leak meant it had a new heat exchanger fitted.
Before I go ringing British Gas (it's under a maintenance contract), is there anything obvious I can check or poke?
Ta, A.