Low hot water pressure in shower
We have a shower that is only 5 years old. The hot water pressure is only a small stream. We have replaced the cartridge and the anti-scald disc in the one handle shower faucet and it does not make any difference. We have checked for a leak in the crawl space and can find nothing wrong. The hot water pressure in the sink is just fine and the cold water pressure in the shower is fine. Any ideas as to what else might be the problem? We have tried everything, even bought the replacement parts twice thinking that maybe there might be something wrong with the new ones.