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Hi All I've got a Rehau manifold for my underfloor heating and I suspect that the mixer valve has failed. The pump is circulating OK but the hot water flow from the boiler isn't coming through to the mixer. Thought it was an air lock initially but now I think the mixer is stuck and is only...

Just wanted to give an update and a HUGE thanks to everyone for all your help - @Nige F , @dilalio, @MeldrewsMate , @MrBenchmark , @terryplumb. It was indeed a blockage at the high level return pipe on the hot water cylinder. There's a 22mm/22mm/15mm compression tee, with the 15mm side at the...

@Nige F just one motorised valve, on the central heating loop. Nothing on the hot water loop. So what actually is the annulus and what is the gurgling sound in the hot water tank if it's two separate waters? Sorry, I'm just not understanding how the hot water tank works.

thanks for everyone's help guys, I think we may be getting some where. we've had the pump turned down to lowest setting as it's only a single storey house. Is the gurgling a good or bad thing? If there is a blockage and we manage to clear it, will it still gurgle in the HW tank when we're...

@dilalio - here's a sketch of the setup @Nige F - is that the same as a Primatic system? If so, that would explain things as we can hear gurgling in the hot water tank. we were worried that the coil had ruptured inside. Also slightly worrying that the previous owners had been putting inhibitor...

Thanks guys. @terryplumb - There's no air vents in the system at all, apart from on the boiler. And yes, have bled the pump more times than I care to remember. @MrBenchmark - yes, ball valve working fine. When I say it's been combined, I'm assuming that's the case as I can't find a separate...

I've checked all over this forum as there's a load of info here on issues with a combined feed and vent but I can't find an answer to my specific problem. I'm helping someone out with their new house where we've had to replace a couple of the radiator valves. Partly drained the system, replaced...