6000s screaming

[LobsterOfJustice]

Hello,

A few weeks ago my 6000s started SCREAMING for a few seconds (2-10) when the controller alternates them before they start pushing water. They have never done this the past 4 years despite infrequent cleaning. I took the pumps out, soaked them in vinegar, and scrubbed them with a toothbrush and after about a week they're screaming again.

What to do?

 

[rvitko]

It may be time to replace the drive units if they are still the originals, part 6100.700. I would first try cleaning the pumps per the top thread in the forum.