Thanks for reply
2 zone UFH with valliant combi boiler
2 room stats(Chronogyr Rev11)
2 pumps
2 honeywell motorised valves
No rads
Not sure about temperatures – that side works fine but the boiler stays on with no demand. Already checked the valves are working ok and had some other useful suggestions from posting on here to try out.
Can’t work out the wiring. Looks like it should be s plan plus minus HW. The UFH seems to have less wiring that most – can’t find a wiring centre for it and it’s just upstairs/downstairs and not room by room.
I think it’s a decent UFH system but has been wired by someone else either cheaply or without sufficient knowledge.
The L from the boiler is connected to same junction as the mains L whereas most wiring diagrams show it to orange from the motorised valves.
The 2 oranges from the valves are wired to different junctions and not sure where the boiler L would go.
But I don’t want to mess about and accidentally send 240v to a 24v circuit or something.
So basically in over my head and need a professional…