New shower mixer - no cold water

[elvis80]

Right, complete amateur alert...

I'm fitting a Bristan recessed thermostatic dual control shower mixer. Have fitted two elsewhere in the house without any issues. Got this one all connected and tested the water...hot is fine, nothing from the cold. When I first turned it on there was sound like it was trying, but absolutely nothing is coming out of it, except it pushes dribbles in the pipe from the previous hot.

Any ideas, please? I'm using 16mm Pex-al-Pex pipe, so was wondering if I've kinked it, but we've blown air through it previously (when labelling the pipes). The pipe is connected to a manifold and the other cold taps are fine.

I wondered about an airlock (there was a bit pssssshhhh noise when I cut the pipe to size - it had a stop end on it previously?) However, I've taken the cold off the shower end and there's water in the pipe.

So I'm thinking it's the shower unit. Might there be a stopper in it of some sort? Is it anything to do with the moveable white ring on the bottom lever (tried just removing it, no difference).

I'm all out of ideas... Please help, I took a day off for this. 🙁

Cheers

 

[elvis80]

Appreciate the manifold taps are off in that pic - they weren't when I tested it.

 

[Ben-gee]

Have you got hot and cold the correct way around to the mixer?

 

[elvis80]

There is definitely pressurised cold in the pipe, it's not overflow from the hot.
Note to self: turn the manifold off before undoing the nut.

 

[elvis80]

Have you got hot and cold the correct way around to the mixer?

I believe so - the left. Tried the mixer with the hot and cold off/on at the manifold and all on too..

 

[elvis80]

Definitely correct way round, just noticed it says H and C on top. Also, I tried all the manifold cold taps, in case they were labelled wrongly.

 

[Deleted member 120897]

I take it from the photo, you’ve undone the nut feeding the shower? If so I’d say either duff valve, or blockage on filter? Daft question, but you have tried selecting just cold? Might you have kinked it further down?

 

[elvis80]

I take it from the photo, you’ve undone the nut feeding the shower? If so I’d say either duff valve, or blockage on filter? Daft question, but you have tried selecting just cold? Might you have kinked it further down?

Thanks. I think you were right. I took the right hand side elbow off and there's a little valve in there. Poked it in with my finger, reconnected everything and it works now! Appreciate your reply.