Overview of Roomba® Plus 400 Combo Robot + AutoWash™ Dock Anatomy and User Interface

Top View 

1. Charging contacts  

2. Dock Alignment Guides

3. Debris Evacuation Port

4. LiDAR Detector Bumper

5. ClearView™ LiDAR

6. Home button  

7. Power button  

8. Robot Top Cover

9. Filter

10. AutoEmpty™ Port or Debris Evacuation Port

11. Bin Release Button

12. Bin

13. Bumper

Note: The ClearView™ LiDAR sensor sits on top of the robot and adds an extra half inch of height when compared to previous models. This may affect the robots ability to fit under furniture.

Bottom View

14. Wheel

15. Multi-Surface Brush

16. Cliff Sensors

17. Floor Type Sensor

18. Caster Wheel

19. Docking Sensor

20. Mop Pad

21. Mop Pad Plate

22. Brush Cover

23. Brush Cover Release Tab

24. Edge-Sweeping Brush

AutoWash™ Dock

Front View

1. Dirty Water Tank

2. Clean Water Tank

3. Charging Contacts

4. Dock Alignment Guides

5. AutoWash™ Water Inlet

6. AutoWash™ Pad Dry recess

7. AutoWash™ Water Drain

8. Trash Indicator

9. Dirty Water Tank LED Indicator

10. Clean Water Tank LED Indicator

11. Charging LED Indicator

12. IR Window

13. Debris Bag Storage

14. Extra Debris Bag

15. Debris Bag Guide Rails

16. Cleaning Brush Accessory

17. Debris Evacuation Port

18. Main Debris Cubby

19. Dock Filter

20. Cubby Door

Rear View

21. Water Tank Handle

22. Water Tank Lid

23. Water Tank Latch

24. Exhaust Vent

25. Removable Power Cord

26. Cord Attachment

27. Cord Wrap

Top View

28. Water Entry Point

29. Dirty Water Float

30. Clean Water Tubing

31. Clean Water Float

32. Removeable Ramp

33. Wheel Track

Charging

Power Button  

• White: Fully charged and connected.  

• Flashing White: Return to dock to charge.  

• Pulsing White: Charging, low battery or software update.

• Flashing Red: Low battery/Error. 

Charging during a cleaning: Your robot will return to the dock whenever it needs to recharge. Once it is sufficiently charged, it will then resume cleaning where it left off.

Standby mode: Your robot uses a small amount of power whenever it is on the dock. You can put it in a further-reduced power state when not in use by pressing the home button for 10 seconds. To exit low power mode short press the power button.

Storing your robot: For long-term storage, turn off your robot by removing it from the dock and holding the power button for 10 seconds. Store in a cool, dry place.

Dock Charging LED Indicators: 

On: Robot on dock charging.

Off: Robot not on dock, robot not charging, or dock is asleep.

Solid White: When the robot is fully charged or in the process of charging. While the dock is automatically emptying the bin, during washing or drying cycles, and when the dock is in standby mode.

NOTE: Software updates may adjust the actual LED behavior on the robot and/or dock. Please visit this article for the most up-to-date information.

Cleaning

Button Controls 

• HOME button: Tap to send the robot home. Press when running to pause. Press when paused to dock. Press when docking to stop.  

• POWER button: Tap to Start / Pause / Resume a job. Hold for 3 seconds to turn on. Hold for 10 seconds to turn off. 

Dock Cleaning LED Indicators

Solid red: Dust bag full, missing, or improperly installed.

Solid red: dirty water tank full, missing, or improperly installed.

Solid red: clean water tank empty, missing, or improperly installed.

Cleaning Pattern

Be sure to remove excess clutter from floors before cleaning and use your robot frequently to maintain well-conditioned floors. Your robot will automatically explore and clean your home in neat rows. It will return to the dock at the end of a cleaning routine whenever it needs to recharge. After 90 minutes of inactivity off the dock, your robot will automatically end its cleaning. If you are unsure if it is finished or paused, visit the Roomba® Home App to check on its status.

Spot clean: Tap the power button two times to spot clean a designated area. After spot clean is complete, your robot will end the job. Press the HOME button to send it back to its dock.  

AutoEmpty™: Your robot will automatically empty its dust bin at the end of every cleaning routine.

NOTE: It is highly recommended to use the Roomba® Home App for cleaning control. The mobile app can be used to clean specific rooms, setup cleaning routines, and create automations/schedules.

NOTE: Roomba robots are generally designed to be used on most floor types for vacuuming. We do not recommend using mopping functions on unsealed hardwood floors and certain laminate/vinyl planks due to potential water damage to the flooring and/or subfloor.

Top View 

1. Charging contacts  
2. Rear Recharging IR Lamp
3. Dock Alignment Mechanisms
4. Debris Evacuation Port
5. Power Button
6. Home Button
7. Robot Top Plate
8. Filter Cartridge Cover
9. Filter Cartridge
10. Dust Bin
11. Debris Evacuation Port
12. Dust Bin Release Button
13. Edge-Following IR Sensor
14. Edge-Sweeping Brush

Bottom View

1. Edge-Sweeping Brush
2. Multi-Surface Brush Cover Release Tabs
3. Caster Wheel
4. Multi-Surface Brush
5. Multi-Surface Brush Cover
6. Wheels
7. Sensors
8. Bumper
9. ClearView™ LiDAR
10. Dual Spinning Mop Pad
11. Dual Spinning Mop Pad Plate
12. Dual Spinning Mop Pad Plate Attachment Port
13. Dual Spinning Mop Pad Plate Extension Arm
14. Edge Following IR Sensor
15. Carpet Sensor

AutoWash™ Dock

Front View

1. Dirty Water Tank
2. Clean Water Tank
3. Cubby Door
4. IR Window
5. LED Indicator
6. Debris Evacuation Port
7. Wash Basin
8. AutoWash™ Water Inlet
9. AutoWash™ Water Drain
10. Debris Guard
11. Dirt Disposal Bag
12. Bag Alignment Mechanisms
13. Dock Filter
14. Charging Contacts
15. Dock Alignment Guides
16. Hot Air Duct

Rear View

1. Water Tank Handle
2. Water Tank Lid
3. Water Tank Latch
4. Cord Attachment
5. Cord Wrap
6. Removable Power Cord

Top View

1. Water Entry Point
2. Dirty Water Float
3. Dirty Water Tank
4. Clean Water Float
5. Clean Water Tubing
6. Clean Water Tank
7. Wheel Tracks

Charging

Power Button  

• White: Fully charged and connected.  
• Flashing White: Return to dock to charge.  
• Pulsing White: Charging, low battery.
• Flashing Red: Low battery/Error. 

Charging during a cleaning: Your robot will return to the dock whenever it needs to recharge. Once it is sufficiently charged, it will then resume cleaning where it left off.

Standby mode: Your robot uses a small amount of power whenever it is on the dock. You can put it in a further-reduced power state when not in use by pressing the home button for 10 seconds. To exit low power mode short press the power button.

Storing your robot: For long-term storage, turn off your robot by removing it from the dock and holding the power button for 10 seconds. Store in a cool, dry place.

Dock LED Indicators: 

Solid White:

• Charging
• Dock Standby Mode or evacuating
• Mop Washing and Pad Drying
• Robot Clean Water Tank is being filled

Solid Red:

• Dust Bag full, missing, or improperly installed
• Dirty Water Tank full, missing, or improperly installed
• Clean Water Tank empty, missing, or improperly installed
• Wash Basin full

 NOTE: Software updates may adjust the actual LED behavior on the robot and/or dock. Please visit this article for the most up-to-date information.

Cleaning

Button Controls 

HOME button:

• Tap to send the robot home
• Press to pause cleaning
• Press when paused to dock
• Press to stop docking

POWER button:

• Tap to Start / Pause / Resume Cleaning
• Hold for 3 seconds to turn on
• Hold for 10 seconds to turn off

 NOTE: Roomba robots are generally designed to be used on most floor types for vacuuming. We do not recommend using mopping functions on unsealed hardwood floors and certain laminate/vinyl planks due to potential water damage to the flooring and/or subfloor.

Cleaning Pattern

Be sure to remove excess clutter from floors before cleaning and use your robot frequently to maintain well-conditioned floors. Your robot will automatically explore and clean your home in neat rows. It will return to the dock at the end of a cleaning routine whenever it needs to recharge. After 90 minutes of inactivity off the dock, your robot will automatically end its cleaning. If you are unsure if it is finished or paused, visit the Roomba® Home App to check on its status

 Spot clean: Tap the power button two times to spot clean a designated area. After spot clean is complete, your robot will end the job. Press the HOME button to send it back to its dock.  

 AutoEmpty™: Your robot will automatically empty its dust bin at the end of every cleaning routine.

Auto-Washing: Your robot will automatically return to the AutoWash™ Dock to wash its pads as needed during Mop only and Vac & Mop tasks.

Mop Pad Plate Extension Arm: The Dual Spinning Mop Pad Plate Extension Arm ensures that your robot can reach tucked away spaces like recessed edges, corners, or other hard to reach spots.

NOTE: It is highly recommended to use the Roomba® Home App for cleaning control. The mobile app can be used to clean specific rooms, setup cleaning routines, and create automations/schedules.

Pad Washing and Pad Drying

Your robot will return to its dock for Pad Washing as needed during cleaning routines and then again when finished.

Pad drying will only take place at the end of its cleaning routine.

Once complete, the dock will proceed to dry the Mop Pads by blowing forced heated air over them.

Visit the Roomba® Home App to manually start Pad Washing, start or stop Pad Drying, or to customize Pad Washing settings.

IMPORTANT: Do not interrupt the robot while Pad Washing is active. It is normal to hear noises throughout this process as the pads spin and the Wash Basin is filled and drained.

NOTE: The drying process can last for a few hours. You can choose from different drying times in the app. You may hear a low hum coming from the dock while the dryer is active