have just checked your link - looks like the valve i have, unfortunately my german/danish is that good anymore, and it makes no sense. ha. cheers.
have disconnected mixing valve head and moved the pin, you can heat it restrict the flow.
have disconnected half the actuator heads - pins move freely.
one thing that did happen. - fired up the ufh, the flow manifold got hot. boiler cut out on its on temp stat. then i isolated the flow port to the manifold, kept the return port open - and partially drained the system via the drain off on the ufh manifold. the return manifold heated up - which it would beacause heat flowing back from the mixing valve. now the ufh seamed to work for 10minutes ish, when i re-opened the flow isolator - only 2 loops were open. when i then decided to open the other loops, the return manifold went cold and nothing again. again made me think, mixing valve not working properly - seamed it needed to heat up first, which is why i thought the original design was plumbed in wrong (didnt know about the mixing valve being in a diverting position then)
apart from re-jigging the pipe work, i'm a little bit stuck on this one
have disconnected mixing valve head and moved the pin, you can heat it restrict the flow.
have disconnected half the actuator heads - pins move freely.
one thing that did happen. - fired up the ufh, the flow manifold got hot. boiler cut out on its on temp stat. then i isolated the flow port to the manifold, kept the return port open - and partially drained the system via the drain off on the ufh manifold. the return manifold heated up - which it would beacause heat flowing back from the mixing valve. now the ufh seamed to work for 10minutes ish, when i re-opened the flow isolator - only 2 loops were open. when i then decided to open the other loops, the return manifold went cold and nothing again. again made me think, mixing valve not working properly - seamed it needed to heat up first, which is why i thought the original design was plumbed in wrong (didnt know about the mixing valve being in a diverting position then)
apart from re-jigging the pipe work, i'm a little bit stuck on this one