Question about iRobot 5800 Scooba Vacuum

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It keeps telling me check tank

It sounds like it is pumping the fluid but then the check tank comes on. We have taken it apart, cleaned, refilled and we still get the check tank. It primed about 5 or 6 times before the warning. I have the 5800 and have not used it very often. The last time I had no problems. The manual is useless since it tells you to go to 18 and then 24 and then back to 18. Can you help?

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  • 61 Answers

Prime Scooba's pump, as described here, but use water instead of air to prime the pump. Water is more effective. You'll have a little puddle under the robot if you've been successful.

Then rinse the tank through all four ports on the underside-- one round, two oval, one large and curved. All four are in a row at the bottom of the transparent area. You'll probably dislodge some clots of debris and sediment. Then refill the tank and run the robot. That ought to do it. If it doesn't, call customer support at 1-877-855-8593.

Posted on May 29, 2009

  • smlamb23 Nov 07, 2010

    This solved the problem of chronic "check tank" as well as not laying down fluid!



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1. Remove and reseat Scooba's battery, ensuring that you hear it click into place.
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4. Fill Scooba’s Clean Tank with approximately 1 cup of cold water, shake vigorously, and empty it to remove any debris in the tank.
5. Empty the Dirty Tank, refill with water, and slosh it around to pick up any sediment. Empty the Dirty Tank again.
6. Refill Scooba’s Clean Tank with water, adding a pinch or two of table salt. Run the Scooba. If the issue persists, please follow the steps below:

With the tank removed, press the Power button and then the Clean button.

If the robot tries to start a cleaning cycle, power off the robot and repeat, pressing the Power button first and then the Clean button. If the pump makes a “whirring” or squirting sound and the robot does not start a cleaning cycle (Check Tank indicator will light), this indicates that the pump is working. Replace the tank and try starting a new cleaning cycle with the tank on.

If Scooba does begin a cleaning cycle the second time you press the Power and then the Clean button with the tank removed, the pump valve could be blocked with debris. Using a turkey baster, straw or sports bottle, force water through Scooba’s solution valve. Confirm that the baster, straw or sports bottle fits snugly over Scooba’s solution valve, push water through the system at least three times, and then try re-starting Scooba.

Below is a link to a diagram of these steps for visual reference:

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