4x means a lot of water, you should be seeing that somewhere.
Right? There no sign of it anywhere in the house. I thought it might be a leaking hose on an open outdoor tap but that's reaching.
The flow fill up is closed (that's the one you use to top it up?), the pressure in the middle of the required range. It does need a service (the icon is flashing). I can hear water moving in the pipes, but not sure where it's going.
I'm going to have to get a chap in I guess - just wondering if it's even possible for a boiler to flow water in the whole time
Any chance you could have a slow leak from a toilet that you haven't noticed, a slow leak from a faulty flush can waste quite a lot without anyone noticing (although 4x seems a lot).
Other than that, you could just systematically close isolation valves to narrow down the problem.
Right? There no sign of it anywhere in the house. I thought it might be a leaking hose on an open outdoor tap but that's reaching.
The flow fill up is closed (that's the one you use to top it up?), the pressure in the middle of the required range. It does need a service (the icon is flashing). I can hear water moving in the pipes, but not sure where it's going.
I'm going to have to get a chap in I guess - just wondering if it's even possible for a boiler to flow water in the whole time