Why is my Eufy RoboVac X8 error 31?

Common causes include software issues, connectivity problems, and settings misconfigurations. Follow our guide to fix your Eufy RoboVac X8.

How do I fix Eufy RoboVac X8 error 31?

Start by restarting your device, checking connections, and updating firmware. Our step-by-step guide provides detailed instructions.

When should I call support for my Eufy RoboVac X8?

If troubleshooting doesn't resolve the issue, or you encounter persistent errors, contact a certified Eufy technician.

Eufy RoboVac X8 Error 31

If your Eufy RoboVac X8 is displaying error 31, you're dealing with a stuck or malfunctioning side brush motor. This common issue prevents your robot vacuum from effectively cleaning along walls and in corners where debris tends to accumulate. The good news is that Eufy RoboVac X8 error 31 can often be resolved at home with basic cleaning and maintenance—no special tools required. Below, we'll walk you through the exact steps to identify the cause, clear the obstruction, and get your RoboVac X8 back to thorough cleaning performance.

What Causes Eufy RoboVac X8 Error 31?

Error 31 on the Eufy RoboVac X8 indicates that the side brush motor is encountering excessive resistance or has become jammed. Hair, string, pet fur, and carpet fibers commonly wrap around the side brush shaft and work their way into the motor housing. In some cases, small objects like rubber bands, twist ties, or pieces of packaging material can also lodge in the mechanism. Understanding this root cause helps you tackle the repair systematically rather than repeatedly resetting your vacuum without addressing the underlying problem.

How to Fix Eufy RoboVac X8 Error 31

Follow these steps in order to diagnose and resolve the Eufy RoboVac X8 error 31 message on your device.

Power Down and Flip the Unit: Turn off your RoboVac X8 using the power switch, then unplug the charging base. Carefully flip the vacuum upside down onto a clean, soft surface to protect the sensors and lidar dome. This gives you full access to the underside components without risking scratches.

Remove and Inspect the Side Brush: Locate the single side brush on the underside of your Eufy RoboVac X8. Use a coin or flathead screwdriver to turn the retaining screw counterclockwise, then lift the brush assembly straight off. Examine the bristles for matted hair, and check the square metal shaft for wrapped debris.

Clear All Debris From the Brush and Shaft: Using scissors, carefully cut away any hair or fibers wrapped around the brush. Pull debris free with tweezers. For the metal shaft, grip wrapped material firmly and unwind it—never force rotation if resistance is felt. Clean the brush thoroughly with warm water if needed, and allow it to dry completely before reassembly.

Clean the Motor Housing Opening: With the side brush removed, shine a flashlight into the motor housing. Use compressed air or a soft brush to dislodge any debris that fell inside. Gently rotate the metal shaft with your fingers—it should turn smoothly with light resistance. If it feels gritty, stuck, or completely frozen, debris remains inside the gearbox.

Reassemble and Test the Side Brush: Once everything is clean and dry, align the side brush with the shaft and press down firmly until seated. Tighten the retaining screw clockwise until snug—do not overtighten. Flip the vacuum right-side up, power it on, and manually start a cleaning cycle. Listen for smooth side brush rotation without clicking or straining sounds.

Reset the Error Code If Needed: If Eufy RoboVac X8 error 31 still appears after cleaning, perform a soft reset by holding the power button for 10 seconds until you hear a tone. For persistent issues, remove the battery for 5 minutes (requires removing the bottom cover with a Phillips screwdriver) to clear cached error states, then reassemble and test again.

Warning: Never force the side brush shaft to rotate if it feels completely seized. Doing so can strip internal plastic gears and permanently damage the motor gearbox. If the shaft won't turn after thorough cleaning, the motor assembly likely needs professional replacement. Additionally, avoid using lubricants or oils near the motor housing—these attract dust and can damage electronic components.

Preventing Future Eufy RoboVac X8 Error 31 Occurrences

Regular maintenance significantly reduces repeat occurrences of Eufy RoboVac X8 error 31. Remove and clean the side brush weekly if you have pets or long-haired residents in your home. Check the brush after cleaning sessions in high-debris areas like entryways or under kitchen cabinets. Consider running your RoboVac X8 on a schedule during times when you can briefly inspect it afterward, catching wrap-around debris before it works into the motor housing. Replacing the side brush every 6-12 months maintains optimal flexibility and reduces motor strain.

Frequently Asked Questions

Can I run my Eufy RoboVac X8 with error 31 if I just avoid edges and corners?

No—operating the vacuum with an active error 31 can cause permanent motor damage. The error code indicates the side brush motor is already under dangerous strain. Continuing to run the unit risks burning out the motor entirely and potentially damaging the main board. Always resolve the error before resuming normal operation.

Where can I buy a replacement side brush for my Eufy RoboVac X8?

Replacement side brushes are available directly from Eufy's official website, through Amazon, or from authorized retailers. Ensure you purchase brushes specifically compatible with the RoboVac X8 series, as side brush designs vary across Eufy models. Genuine Eufy parts typically include the retaining screw and offer proper fitment.

How do I know if I need a side brush motor replacement rather than just cleaning?

If the metal shaft still won't rotate smoothly after thorough debris removal, produces grinding noises, or the error returns immediately after reset, the internal gearbox or motor is likely damaged. You may also notice a burning smell during attempted operation. In these cases, professional motor replacement is necessary—contacting a certified repair service ensures proper diagnosis and preserves your warranty coverage.

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