Yes, it's the pot in the handle. First of all, do you have the pass word to get into learn mode? Try default 1 for password, 2 for superword.
Need superword for learn, diagnostics. Without superword, you cant even install a rebuilt handle because its needs calibration to work.
Before doing anything, make sure the set screw that locks the handle is tight. If it backs off,the handle will be out of adjustment. Check this, and do you have the superword?
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.