I recently started getting the check tank lit issue on my Scooba 5800, which worked fine before.
The pump whirs for a few seconds when I press the clean button, then the check tank green light comes lit.
I check the battery setting more than once as suggested by iRobot
by removing an repositioning it and it looks like everything is ok, though the tank locking does not provide a clear sound.
I hadn't used my Scooba for sometime when the issue first appeared and I notice that, as soon as the tank is fitted and locked int the chassis, some water pour out of the poppet valve since the chassis pocket around the pump inlet is full with water when I remove the tank, even if I didn't press the "clean" button.
I wonder whether this latter behavior is normal or is possibly a hint of something wrong with the tank or the pump.
Does anyone have any advice?