hi susand
there appears to be 2-3 options for the problem and an equal # of solutions...
-the mixer valve IN/behind the shower handle...
-the bypass valve may not be fully open...
-and there is always the possibllity of debris in the hot water line at the shower...
here are some places to read,
http://www.airforums.com/forums/488923-post3.html
http://www.airforums.com/forums/f365...wer-29685.html
http://www.airforums.com/forums/f443...ems-38359.html
and don't forget the moen manuals online or IN your 'streamer packets...
once your problem is sorted out and the hot stuff is flowing,
be sure to followup here with the problem and fix...
don't leave us hanging in the tepid zone!
cheers
2air'