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Hi Dan. been reading few posts of yours and was wondering if you work in North West London (Harrow)? I've got an UFH circuit + rad zone + unvented cyclinder that needs looking into in terms of the installation

btw, can it be reversed? is the main controller VRC 470 controlling the UFH and VR81 controlling the CH?

I just came off the call with Vaillant tech support and their response was: "If using one heating zone (for rads) and one UFH and a cylinder with a System Boiler (newer ecotec 600+ series) then you can use: - VRC 470 (or 470F if needing wireless capabilities) - VR61 wiring centre giving...

Many thanks for the reply. Another quick one related to the controls. Is it possible to reverse the order? ie the 430 (or 470F) to control the UFH and VR81 to control the rads (CH)?

Hi Milleniumaire It is possible to know what the final solution was/is on your installation? Thanks

No luck. Tried once more. For now, I have lowered the boiler flow temp to 38 as I think the water in the circuit is higher and the boiler isnt running at the moment, but the pump is. There is some kind of pump/fan running inside the boiler it seems. I am btw in Harrow

I have switched it off 2 times already. Do I need to wait for specific time before switching it back on?

You can see the valve underneath the pump

I do see one on the UFH circuit underneath the pump (looks like its on the return flow), one on the rads pipe going upstairs, one near the water cylinder. Havent seen the 4th one but will check. Is there anything I can check on the UFH valve to confirm if its faulty? I also have switched...

Hi all I have a Vaillant Ecotec 624 System boiler with uniSTOR 210L cylinder. also have a 3 channel hortsmann programmer which controls: a- Hot Water b- Heating Zone 1 - Radiators downstairs c- Heating Zone 2 - Radiators upstairs (both radiator zone are controlled via 2 separate...