I have a stand-up shower in my basement that was put in about 3-4 years ago. I went to use it for the first time yesterday and the water only trickles out when turned to hot (works fine on cold). It is a single knob Moen system with no faucet, only a shower head. All other outlets in the house work fine, even the sink that is right next to the shower. Please Help.

Thanks, Michael

Hey Michael,

Sounds like you have some crud in the inlet ports of the cartridge, (see image) shut the water off at the stops and open up the valve and remove the cartridge and clean the ports.
I have put up a exploded view as a guide,( see image). If you need instructions on how to remove the cartridge click on back. Before you button things back up, turn the water back on to flush out the supplies.
Good lusk, Tom