A shower in one of our bathrooms isn't producing any hot water (but every other sink/tub in the house is). I tried to fix this by loosening the limit screw so the handle would go a bit farther and warm/slightly hot water started to come out, but only as a light trickle.
From everything that I've read online, it sounds like I may have to replace the valve/cartridge (are these terms interchangeable?), but I'm unsure how to do so.
Below is a picture of what I'm dealing with. The shower hardware brand is Symmons and the valve/cartridge below isn't what I've been seeing in any of the DIY YouTube videos.
If I wanted to replace this, how would I take it apart?
I can't tell if this is one piece or if I can take it apart piece by piece. I've gotten some estimates from a couple plumbers and they're saying this is going to be a $300-350 fix for just labor, so I'm trying to see if this is something I can do myself.
Any advice and suggestions would be greatly appreciated!