try switching the impeller with your other ac110?
im guessing you have 2.. if not... http://www.bigalsonline.com/BigAlsUS/ctl3684/cp18675/si1378671/cl0/impellerassemblyfaquaclear110500 replacement impellers are pretty cheap
keep us posted
im guessing you have 2.. if not... http://www.bigalsonline.com/BigAlsUS/ctl3684/cp18675/si1378671/cl0/impellerassemblyfaquaclear110500 replacement impellers are pretty cheap
keep us posted