Your robot is able to both vacuum and mop at the same time when the mopping pad plate and mopping pad are installed.
Your robot will automatically avoid carpets in vac + mop or mop-only cleaning modes when the water tank and mop pad are installed.
IMPORTANT: Do not add liquids such as hot water, detergent, or disinfectant as they could damage the robot. Only use iRobot approved floor washing detergent as shown on our support site: 
Approved Cleaning Solutions for Mopping and Combo Robots.
After completing your mopping and vacuum cleaning job, make sure to empty the water tank and replace the mopping pad.
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Slide the mop pad along the slot of the water tank, and then attach the pad firmly onto the velcro.
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Fill the tank with water by opening tank lid, filling the tank with water, and reattaching the lid.
CAUTION: Do not rinse the water tank or immerse it in water. To avoid corrosion and damage, do not use any detergent, disinfectant, solid cleaner, or other cleaning products on the water tank.
CAUTION: Do not add hot water to the water tank, as this may cause it to become deformed.
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Reinstall water tank. Slide the water tank horizontally into the bottom of the vacuum-mop until it clicks into place.
NOTE: If your robot needs water in the middle of a job, tap the power button or use the mobile app to pause. Remove the bin and add water. Reinstall the bin, and press the power button again to resume.
NOTE: Before using, wipe the electrode plates of the water tank clean with a dry cloth.
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Place the robot back on the dock and use the app or robots button to start cleaning.
