My booster pump stopped working suddenly. Its a Polaris PB-4. about 3 yrs old.
I noticed that the pump makes a humming sound when started but does not turn. I opened the pump's volute casing and tried turning the pump by hand, the pump turns with a slight resistance in certain positions. I ran the pump with the volute casing off and the pump ran well under electrical power.
I boxed the volute casing back and tried running the pump but the pump will not run, still makes a humming sound.
Please advise. Thanks.