iRobot Roomba Error Code 41: How to Fix It
Easy 10-20 minutes Medium Severity
Verified June 2026
- Error Code
- 41
- Brand
- iRobot Roomba
- Product Type
- robot_vacuum
- Severity
- Medium
- DIY Difficulty
- Easy
- Estimated Fix Time
- 10-20 minutes
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Tools You'll Need
- Microfiber cloth
- Cotton swabs
- Isopropyl alcohol (70% or higher)
- iRobot Home app (for reset and diagnostics)
How to Fix Error Code 41
-
Power Off Your Roomba
Always power off the Roomba before removing or reseating the water tank to avoid electrical contact issues or triggering the motors unexpectedly. -
Remove the Water Tank
-
Inspect the Tank and Robot Contacts
-
Clean the Contacts
Make sure all contacts are completely dry before reinserting the tank or powering the robot back on. Moisture on electrical contacts can cause short circuits. -
Check the Tank for Damage or Warping
-
Reseat the Water Tank Firmly
-
Power On and Test
-
Reset the Roomba
A factory reset erases all saved floor maps and preferences. Only do this if reseating and cleaning the contacts did not resolve the error. -
Replace the Water Tank if Needed
Only use water tanks designed for your specific Roomba Combo model. Using incompatible tanks can trigger the same error or cause other issues.
Parts You May Need
Roomba Combo Water Tank
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Roomba Combo Water Tank
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Roomba Combo Water Tank
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Roomba Combo Water Tank
Check Price on Amazon
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When to Call a Professional
If you have replaced the water tank with a confirmed compatible unit and Error Code 41 still appears after cleaning contacts and resetting the robot, the issue may be with the internal sensor inside the tank bay on the robot itself. At that point, contact iRobot Support directly — the robot may be covered under warranty, or iRobot's support team can arrange a repair or replacement. Do not attempt to open the robot body or repair internal sensors yourself, as this voids your warranty and can cause further damage.Frequently Asked Questions
What does Roomba Error Code 41 mean?
Roomba Error Code 41 means the robot's water tank is not detected or is not properly connected. This error appears on Roomba Combo models and is triggered when the robot's sensor cannot confirm the tank is seated correctly in its bay.
Can I run my Roomba Combo without the water tank installed?
No. On Roomba Combo models, the water tank is a required component for the robot to function. If the tank is missing or not properly connected, the robot will display Error Code 41 and will not start a cleaning cycle. You must have a compatible tank properly seated to use the robot.
Why does my Roomba keep showing Error 41 even after I put the tank back in?
If Error Code 41 persists after reseating the tank, the most common causes are dirty or corroded electrical contacts on the tank or inside the bay, a warped or damaged tank that won't seat flush, or a faulty tank that needs to be replaced. Clean the contacts with isopropyl alcohol, let them dry, and reseat the tank. If the error continues, try a factory reset or replace the tank.
How do I reset my Roomba to fix Error Code 41?
To reset your Roomba, press and hold the Clean button on the robot for about 20 seconds until you hear a tone, or use the iRobot Home app by going to Settings and selecting Factory Reset. Keep in mind that a factory reset will erase all saved maps and preferences, so you will need to set up the robot again after the reset is complete.
What Roomba models can get Error Code 41?
Error Code 41 specifically applies to Roomba Combo models that include a built-in water tank for mopping functionality, such as the Roomba Combo j series and similar models. If you own a vacuum-only Roomba without mopping features, you would not encounter this error.