The valve and the valve cartridge should be different, the cartridge sits in the valve and should be removable most likely after the handle is removed. You can start at the cartridge like u/jerseywiseguy said and if that doesn’t fix it then move on to bigger things like the valve. Make sure you shut your water off to the house before removing that cartridge and replacing.
boodyseeker0327 t1_jecuf33 wrote
Reply to Shower hot water / anti-scald valve by maxnpj
The valve and the valve cartridge should be different, the cartridge sits in the valve and should be removable most likely after the handle is removed. You can start at the cartridge like u/jerseywiseguy said and if that doesn’t fix it then move on to bigger things like the valve. Make sure you shut your water off to the house before removing that cartridge and replacing.