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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...

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...