1. No hot water coming from shower even though there is hot water coming from face basin in same bathroom and throughout the house( moen plumbing)
2. when water heater valve to house is turned off the cold water and hot water from shower does not flow, yet in other faucets throughout the house there is cold water. (moen Plumbing)

Has any work been done recently? I can exlain issue #1 but #2 is more tricky since the cold should not be affected by shutting off the water heater supply unles your shower cold tap is after that shut off. Where is the shut off to the heater. The #1 issue could be aclogged hot inlet on the left of the cartrdige. Do you need instructions for opening and clearly this? Installation Help / Animated Tutorial - Installing the Moen 1225 / 1200 Cartridge