Scooba 380 check tank but passes all tests

[robotjunky]

I have a 380 that turns on, squirts water then stops with a check tank light (no blower although it runs fine in testing with no issues). I have swapped out tanks (known clean and working) and run it through the tests and it passes. It passes test 12 and has no issues putting out water. It recognizes the tank in test 7. It doesn't have a conductivity sensor for test 13 so that test doesn't pass - just squirts water. Any other ideas? Could the water pump be borderline even though it squirts fine?
Thanks for any ideas!

[Twobeers]

The round hole on the one side of the tank is the inlet, the square hole on the oposite side is the outlet. It may look clean, water rinses thru easily. Stick a water hose into the round hole & run water thru with moderate pressure for awhile. I did that to mine & got a piece that came out that resembled a piece of pet turd after 5 minutes. You can use your finders to alternately block some of the holes were water is flowing out to force into other passages more aggresively.