Bristan Mixer Shower Keeps Going Cold

[steadyon]

If its a bar mixer, the filters will most likely be in the two inlets where the shower is attached to the wall, and probably no non-return valves.
If it's a concealed shower, could be anywhere.
Need to know the type and model.

 

[king of pipes]

Just a thought watch what the boiler does when the shower is running if you have other showers that work ok there must be a restriction somewhere

 

[Bazza4465]

If its a bar mixer, the filters will most likely be in the two inlets where the shower is attached to the wall, and probably no non-return valves.
If it's a concealed shower, could be anywhere.
Need to know the type and model.

I only know that it is a Bristan shower. Attached is a photo of the shower and one with just the cartridge showing, is this of any help to show me where the non-return valve and filter are.
Thanks

 

[Bazza4465]

If its a bar mixer, the filters will most likely be in the two inlets where the shower is attached to the wall, and probably no non-return valves.
If it's a concealed shower, could be anywhere.
Need to know the type and model.

Sorry about the last post with multiple attachments, I didn't think they were being attached and tried multiple times and posted it before realising.

 

[Bazza4465]

Just a thought watch what the boiler does when the shower is running if you have other showers that work ok there must be a restriction somewhere

King of Pipes - What should I watch for on the boiler when the shower is running.

Thanks