When the knob on our Moen single-knob shower faucet is pointing at the 6 o'clock position (Which should be the "OFF" position) VERY hot water comes out at a low pressure. If the knob is turned to the 9 0'clock position, (which should be the maximum HOT position) very COLD water comes out. The water shuts off at the 4 o'clock position. We cannot get any water temp that is comfortable to use for showering. What's going on & how do we fix this? Thanks anyone who knows the answer...

Take knob or handle off, turn stem 180 degrees, reinstall knob or handle

I think Harold has it but skipped a step. After you remove the handle you must remove the small clip on top of the cartridge and then rotate 180 degrees, now reinstall the clip

Don't think so Bob, I think you just have to turn stem. Shouldn't be necessary to rotate body of cartridge.

Dear hkstroud, thank you -- your advice worked perfectly, the faucet is working perfectly now & it made me feel like Rosie the Riveter when I was able to fix it without calling a plumber! God Bless you! ElizabethG