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This is getting weird now - pump and valve suddenly came on today and right now all is working fine, though not sure for how long...

Thanks to everyone again for your replies. Unfortunately the trick with manually opening valve doesn't work anymore and pump doesn't come on. I think if I leave it open long enough the hot water eventually gets into the UFH circuit and heats the room but I am not sure this is good idea as in my...

Thanks you SpecialK. I've got a multimeter, can test, where it is connected to the relay in the control box. Will watch it for a while, at least I seem to be able to switch UFH on when it gets cold. Will be back for further advice soon!

This morning however UFH did not start again, so I manually opened valve and pump came on. Does this mean valve is faulty and need replacement or something more complicated?

Thanks very much for the response. Tried that and could feel hot water coming through to UFH to the system. Changed heating curve setting on control display which was for some reason set incorrectly to 1.30. and is started working.

Not sure what is wrong, but this morning pump and UFH worked, everything was fine, but in the evening not working again and no current. It also appears that motorised Honeywell valve for UFH and pump are not activated while VRC shows that pump is on UFH working. Any idea what could be the issue ?

Thank you Cross Thread, I added more photos. Indeed there is no current at the pump at all, the simple tester doesn't light up. There is also no current on the rightmost connector in the wiring box. I tested after boiler fired up to activate UFH.

Hi All, This forum helped me a lot in the past and I am hoping that I can get help and advice this time . I just noticed that UFH is not working and when checked the pump it appears it has no light on. It has been working fine for 8 years. There is supply current and boiler control unit...

Found my old post with system info :) Vaillant ecotech 624 system boiler v.6.08 - Unistor cylinder 210L - VR 61/4 Control centre v.4.18 - VRC 470 weather compensator (used as thermostat used for UFH zone downstairs) v.4.20 - VR 81/2 thermostat for CH upstairs v.2.02 - DHW circulation pump...

I've got Vaillant system with VRC470 control unit and control know is not responding. Since VRC470 is discontinued I am now considering replacin git with VRC720 Is a matter of simply removing VRC470 and disconnecting eBus and connecting VRC720 or much more complicated and professional installer...

Thank you, was going to try and clean it but it the moment cant figure out how to remove it from the base plate attached to the wall. I understand it would be simply prying with a screwdriver but don't want to break it

bump! If not possible to fix the knob, how difficult would be to replace VRC470 with newer VRC700 unit DYI, if possible at all.

Hi all, I've got VRC470 control unit for valliant boiler and some time ago the control knob started misbehaving. Basically, when I rotate it even slightly to navigate the menu, the cursor (highlighted item) jumps randomly. Looks like a problem with the knob. Does anyone have any idea ho to...

Hi, I am looking for 1 pack or even 6-7 boards of Bebe LOC rustic coffee oak effect laminate, bough from BNQ not sure how many years ago... 10 or more. I still have one plank and couple offcuts. I tried to attach photo of the label and off cuts. Is all Bevel LOL laminate manufactured by...

Thanks a lot, all done without draining, - lots of time and water saved!

Thanks JohnD, is it ok to use pushfit then on a wet pipe?

sorry, here is new link - https://ibb.co/d6NpPb Radiator has been removed already before the work on room started, both valves closed but I will have to remove pieces of pipe with old valves and add length to one pipe and shorten another one - under floor boards, adding new elbows to connect...

room have been completely re-done with new furniture in etc. replacing single panel old rad with a modern 2 panel one but higher BTU

I need to replace rad upstairs to a smaller one hence would need to realign the pipes. It appears there is no radiator with drain valve but there are 2 on Unistor cylinder. This is unvented system with 2 zones - 1) underfloor heating and 2) radiators (2 downstairs and 5 upstairs). I presume...