The hot water in the main shower has stopped coming through. There is hot water in the bathroom sink though.
What could be the issue?
Thanks for your help.

Have you had any plumbing work done recently? If so you may have so dirt in the hot water faucet. Shut off water and remove the valve. If you can, put a piece of metal under valve set and turn water on for about 3 seconds. Remove metal and reinstall valve. You can use a cut tin can for the metal.

Turn on water. If this does not work get back to us and we will go from there.

Chuck

Creahands Nailed it! You have some trash clogging the cartridge.
Try this. Shut the water off and pull the cartridge, Check the inlet ports for trash and clean. Now place a pan over the open valve and turn the water back on for a minute to flush out the supply. You should have a strong stream when doing so. Reassemble and test. If that works do it on all affected taps, good luck, Tom