Robot vacuum shows E15 and stops; often associated with water tank or mopping module on hybrid models.

Safety first: Turn OFF the robot and remove the water tank. Do not turn the robot upside down with water in the tank.

Check tank installation:

• Inspect the water tank for cracks or deformation.
• Reinsert the tank firmly until it clicks into place.

Clean contacts and switches:

• If your model uses electrical contacts between the tank and robot, wipe them dry and clean with a soft cloth.
• Clean around the tank detection switch or sensor area on the robot body.

Inspect magnets/sensors:

• Some tanks use a magnet to trigger a reed switch. Ensure the magnet is still attached and not displaced.

Test:

• Power ON the robot without the tank to see if the error clears, then attach the tank and start a mopping cycle.

Advanced: If E15 persists with a known-good tank, the detection switch or sensor on the robot may be faulty and require professional repair.