Shower not getting hot

[nohotwater]

Just moved into a new place, and the shower isn't working properly.

Here's how it goes:

1) It becomes lukewarm only.
2) Especially if the boiler is on, it becomes very hot for a short time then the water pressure disappears and it stops flowing. After a while it starts going full force with hot or lukewarm water.
3) It works, but the water is very hot.

Not sure where to start troubleshooting this. Obviously we've tried turning the heat up or down, but it has no effect. And other taps have do have hot water.

Any ideas?

 

[exedon2]

Picture of said shower would be useful
Probably worth checking any filters on inlets of shower.
After that could need new mixing cartridge.

 

[nohotwater]

Thanks a lot for the advice.

I've included a pic of the shower if it helps -- not sure if there's a specific part that's helpful to look at?

 

[Deleted member 120897]

Try it without the head and hose connected, see what it’s like then.

 

[nohotwater]

Try it without the head and hose connected, see what it’s like then.

Thank you for the tip -- I tried that. Seemingly the same or similar.

I tried the bathtub tap opposite the shower, it gets proper hot. This one stays mostly lukewarm.

 

[Deleted member 120897]

It would seem the thermostatic cartridge is goosed Then, unless you’re not taking it above 38? Some have an override on them.

 

[exedon2]

That's a bar type shower easily replaced they all tend to have 150mm centers .
May be easier/quicker just to to replace .

 

[nohotwater]

Got it, will look into that. Thanks both!