Introduction
The iRobot Roomba Combo i3+ (3574) is a versatile robot vacuum and mop designed to handle both wet and dry messes on various floor types. This manual provides essential information for setting up, operating, maintaining, and troubleshooting your device to ensure optimal performance.
The Roomba Combo i3+ features a 4-Stage Cleaning System, self-emptying capabilities for up to 60 days, and Imprint Smart Mapping for customized cleaning. It is equipped with Dirt Detect Technology to focus on high-traffic areas and is ideal for homes with pets due to its Dual Multi-Surface Rubber Brushes.

Figure 1: The iRobot Roomba Combo i3+ Robot Vacuum and Mop.
Setup
Unboxing and Placement
- Carefully remove all components from the packaging.
- Place the Clean Base® Automatic Dirt Disposal (docking station) against a wall in an open, uncluttered area. Ensure there is at least 1.5 feet (0.5 meters) of clear space on either side of the base and 4 feet (1.2 meters) in front.
- Plug the Clean Base into a power outlet.
Initial Charging
- Place the Roomba Combo i3+ robot onto the Clean Base. The robot will automatically begin charging.
- Allow the robot to charge completely before its first use. The light ring on the robot will pulse white while charging and turn solid white when fully charged.
iRobot Home App Installation
- Download the iRobot Home app from your mobile device's app store.
- Follow the in-app instructions to connect your Roomba Combo i3+ to your home Wi-Fi network and complete the setup process. This will enable smart mapping, scheduling, and voice control features.
Operating Instructions
Vacuuming Only
- Ensure the Vacuum Bin is installed in the robot.
- Press the CLEAN button on the robot or use the iRobot Home app to start a cleaning cycle.
- The robot will automatically return to the Clean Base to empty its bin and recharge as needed.

Figure 2: The Roomba Combo i3+ can be configured for vacuum-only or vacuum and mop by swapping the bins.
Vacuuming and Mopping
- Remove the Vacuum Bin and install the Roomba Combo Bin.
- Open the fill cap on the Roomba Combo Bin and fill it with water or a compatible cleaning solution (refer to the iRobot website for a list of approved solutions). Close the cap securely.
- Attach the specialized microfiber mop pad to the Roomba Combo Bin.
- Press the CLEAN button on the robot or use the iRobot Home app to start a cleaning cycle. The robot will now vacuum and mop hard floors simultaneously.

Figure 3: Filling the Roomba Combo Bin with water or a compatible cleaning solution.
Smart Mapping and Navigation
- The robot learns your home layout and creates an Imprint Smart Map, visible in the iRobot Home app.
- Use the app to define specific rooms, set cleaning schedules, or direct the robot to clean particular areas.
- Dirt Detect Technology: The robot uses patented technology to identify dirtier areas and cleans them more thoroughly when the Vacuum Bin is installed.
- Reactive Sensor Technology: Helps the robot avoid getting stuck by navigating around obstacles.

Figure 4: The robot learns and maps your home with Imprint Smart Mapping.

Figure 5: The robot focuses on dirtier areas using Dirt Detect™ Technology.
Voice Control
- Pair your Roomba Combo i3+ with Amazon Alexa, Siri, or Google Assistant-enabled devices.
- Use voice commands such as "Alexa, tell Roomba Combo to vacuum and mop the kitchen" to initiate cleaning tasks.

Figure 6: Control your Roomba Combo i3+ with voice commands.
Automatic Recharge and Resume
- If the battery runs low during a cleaning cycle, the robot will automatically return to its Clean Base to recharge.
- Once sufficiently charged, it will resume cleaning from where it left off to complete the job.

Figure 7: The robot recharges and resumes cleaning where it left off.
Maintenance
Regular maintenance is crucial for the longevity and optimal performance of your Roomba Combo i3+.
Clean Base Automatic Dirt Disposal
- The Clean Base automatically empties the robot's Vacuum Bin into an enclosed bag, holding up to 60 days of debris.
- Replace the disposal bag when the indicator light on the Clean Base illuminates or when the iRobot Home app notifies you.

Figure 8: The Clean Base automatically empties the Vacuum Bin for up to 60 days.
Filter Maintenance
- The robot uses a high-efficiency filter (cartridge type) to capture pollen, mold, dust mites, and pet allergens.
- Clean the filter regularly by tapping it against a trash can to remove debris.
- Replace the filter every 2-3 months, or more frequently if you have pets or allergies.
Brush Maintenance
- The Dual Multi-Surface Rubber Brushes are designed to prevent tangles with pet hair.
- Regularly remove the brushes and clean any hair or debris wrapped around them or trapped in the brush bearings.
- The edge-sweeping brush should also be checked and cleaned for tangled hair.

Figure 9: The 4-Stage Cleaning System, including the edge-sweeping brush and dual multi-surface rubber brushes.
Mop Pad Care
- After each mopping cycle, remove the microfiber mop pad from the Roomba Combo Bin.
- Wash the mop pad by hand or machine wash according to the care instructions. Allow it to air dry completely before reattaching.
Troubleshooting
If your Roomba Combo i3+ encounters an issue, the robot's light ring may change color or an audible alert may sound. Refer to the iRobot Home app for specific error messages and troubleshooting steps.
Common Issues and Solutions
- Robot is stuck or not moving: Clear any obstacles around the robot. Check the wheels and brushes for debris. Ensure the robot is on a flat surface.
- Poor cleaning performance: Clean the brushes, filter, and sensors. Ensure the correct bin (Vacuum or Combo) is installed for the task.
- Robot not returning to Clean Base: Ensure the Clean Base is plugged in and has clear space around it. Clean the charging contacts on both the robot and the base.
- Trouble emptying the bin: Ensure the Vacuum Bin is properly seated in the robot and the Clean Base bag is not full. Check for any blockages in the Clean Base's suction path.
- Mop not dispensing water: Ensure the Roomba Combo Bin is filled with water/solution and the mop pad is correctly attached. Check for any clogs in the water nozzle.
For more detailed troubleshooting, consult the iRobot Home app or visit the official iRobot support website.
Specifications
| Feature | Detail |
|---|---|
| Brand | iRobot |
| Model Name | Roomba Combo i3+ |
| Model Number | i357420 |
| Surface Recommendation | Carpet & Hard Floor |
| Special Features | Anti-Fall, Dirt Detection Sensor, Edge Cleaning, Pet Hair Pick Up, Room-By-Room Navigation, Scheduling, Self-Emptying, Simultaneous Vacuuming & Mopping, Smart Mapping, Wet/Dry |
| Controller Type | App Control |
| Filter Type | Cartridge |
| Battery Life | 75 minutes |
| Battery Type | Lithium Ion |
| Power Source | Battery Powered |
| Compatible Devices | Amazon Echo, Google Home |
| Item Dimensions (L x W x H) | 13.4"L x 13.5"W x 3.6"H |
| Item Weight | 9.26 Kilograms |
| Included Components | Docking Station (Clean Base Automatic Dirt Disposal) |
Warranty and Support
Official Product Overview
Video 1: An official overview of the Roomba Combo i3+ Robot Vacuum & Mop, highlighting its key features and functionality.
Warranty Information
iRobot provides a limited warranty for its products. For specific details regarding the warranty period, coverage, and terms, please refer to the warranty card included with your product or visit the official iRobot website. The Pet Owner Official Promise (P.O.O.P.) offers a replacement product for 1 year from purchase if the Roomba j7+ (or similar models with pet waste avoidance) runs into solid cat or dog waste. Please check the iRobot website for full terms and conditions.
Customer Support
For further assistance, technical support, or to purchase replacement parts and accessories, please contact iRobot Customer Care through the iRobot Home app or by visiting the official iRobot support website. Ensure you have your product's model number (i357420) and serial number ready when contacting support.