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The 350F has been problematic eversince ive had the bolier installed. Switching on by itself and losing connection, wanted to try a different solution.

Thanks Johnmdc, all working, I'm a happy chap :)

Thanks for your help, unfortunately, didn't understand the single/dual control, as on Amazon there is no option for either and I picked the "heating, hot water" choice. Another expensive doorstop :(

Hi Stem thanks, I'll redo the wiring :) I've followed the hand-drawn diagram if that's any help? So am I right in thinking I have to set the inbuilt controller to be permanently on for both hot water and heating? I've not come across that in any other threads, is this a known issue that isn't...

Hi All, I am trying to replace the vrt350f unit with the hive as it is extremely unreliable. I could really do with some help as I'm going round in circles trying to get the hive to work with this boiler, I'll include photos of all I have done, plus following someone else's wiring guide which...

Vaillent 831 Hive Install