Does your serial number start with...b815? If so...after centering the pot...you'll have to calibrate the main interface board...
I've also had problems with the wiring...i've soldered the wires staight from the pot to the harness...bypassing the 3 wire connecter...a number of times
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.