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Unless you want to purchase a bowser then you're asking for something that doesn't exist! I have a friend who lives in 2nd floor flat... He wanted a way to wash his van from his kitchen tap... I simply installed a connection to the kitchen tap cold feed under the sink that had a lever valve...

Thought it was a given.

Wagos were for testing and then for commoning the LNEs so that only the switch wires needed to be separated... Made wiring up the new UFH zones much simpler ;)

The problem is that check valves do not pose a barrier to bacteria that can migrate across. Dare I say... Like the English Channel!

Trying to do a cheap up and down zone, without 2 ports?

Glad you got it sorted. As said... It's usually a wiring error! Makes it more difficult to sort as a visiting engineer when customer has "had a try" themselves ;)

But are not allowed under WRAS as a new install... only when replacing existing.

So, do you have one zone but 2 stats? And each stat should bring the heating on, depending on which one has the lower target temp?

Why was the receiver dead? Did they explain that?

Depends where power taken off for roomstat receiver!

Best thing is to put a tee through the wall and an outside tap. It's usually a very simple job... Depends where your kitchen sink is and if on an outside wall.

As above... If you've disturbed a fitting... Change it.

"Ok thanks will do that. Is there than another grey in with the oranges that feeds the boiler? I think I have wired 2 greys the wrong way round" Yes. Potientallly, it could be a grey wire that takes the 240V from the commoned oranges, to the boiler! It all depends on what cable the installer...

Receiver power sometimes taken from boiler terminals. Usually upstream of any on board fuses though. Who knows how it's been wired, without eyes on. If you've no testing equipment or knowledge on how to use it, then you will need a visit. If they share the same spur and alarm is powered then...

The difference is... If vaillant send out an engineer and it's not the boiler, they charge you anyway, so they always give the installer /customer's regular operative, the opportunity first, as they also charge, but will offer to repair if it's a fault outside the boiler.

Do you mean on your main fuse board? Have you looked for a fused spur? And checked the 3 amp fuse in that?

Put the greys together and the oranges together... As I said above "commoned" If you had 4 x 2ports you'd have 4 greys in together and 4 oranges together!

Very likely a wiring fault... Usually is. Greys do not go in with oranges in terminal strip... Because... They should only be connected electrically... When the microswitch in the power head "makes"!

And while the head is off... Give the spindle a twist back and forth... See how easy it moves... Not a lot of travel in °s but should be easy. Valve may too stiff for synchron. Give it a squirt of a lubricant.