Roborock S8 Pro Ultra robot vacuum
- Category
- Robot vacuums
- Model number
- S8 Pro Ultra, S81USP, EWFD07LRR, EWFD08LRR
- Region
- United States (FCC edition)
- Verified
- Error 4
- Error 5
- Error 7
- Error 9
- Error 10
- Error 13
- Error 18
- Error 42: maintenance brush jammed
- Dock status indicator light steady red
- Power indicator light flashing red
- Power indicator light white
- Power indicator light red
- Power indicator light pulsing
- Dock status indicator light pulsing
- Dock status indicator light off
- WiFi indicator off
- WiFi indicator flashing slowly
- WiFi indicator flashing quickly
- WiFi indicator steady
- The robot will not power on
- The robot will not charge
- The robot charges slowly
- The robot cannot dock
- The robot behaves abnormally
- The robot is noisy during cleaning
- The robot cannot connect to WiFi
- Poor cleaning ability or dust falling out
- Scheduled cleaning is not working
- No or little water during mopping
- Cleaning does not resume after recharging
- The robot cannot return to the dock after spot cleaning or being moved
- The robot misses certain spots
- Reduced emptying performance or unusual noise when emptying
- Reduced mop washing performance
- Auto-emptying is not working
- The mop is not washed
- Poor drying effect
- How to reset the WiFi connection
- How to reset the robot system
- How to restore the robot to factory settings
- How to fill the clean water tank
- How to clean the main brushes
- How to clean the side brush
- How to clean the omni-directional wheel
- How to empty and clean the dustbin
- How to clean the washable filter
- How to clean the VibraRise mop cloth
- How to clean the robot sensors
- How to clean the charging contacts
- How to empty and clean the dirty water tank
- How to clean the high-speed maintenance brush
- How to clean the water filter
- How to replace the disposable dust bag
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Error codes
| Code | Meaning | Checks |
|---|---|---|
| Error 4 | Roborock's checks for Error 4: wipe the cliff sensors and keep the robot off dark or shag carpet. | Checks |
| Error 5 | Roborock's checks for Error 5: look for anything tangled in the main brush, its two installation slots and both ends, then run the robot with Carpet mode enabled. | Checks |
| Error 7 | Roborock's check for Error 7: press and spin the wheels by hand to see whether they are stuck. | Checks |
| Error 9 | Roborock's check for Error 9: look for the magnet on the side of the filter. | Checks |
| Error 10 | Roborock's fix for Error 10: clean the filter, dry it thoroughly and put it back in the robot. | Checks |
| Error 13 | Roborock's checks for Error 13: charging contacts, the dock's indicator light, the power cable connection and a 2-minute unplug. | Checks |
| Error 18 | Roborock's fix for Error 18: clap the side of the robot several times to clear debris from the fan. | Checks |
| Error 42: maintenance brush jammed | The high-speed maintenance brush in the dock is jammed; the robot announces it by voice alert. | 2 causes |
| Dock status indicator light steady red | The dock has an error. | 5 causes |
| Power indicator light flashing red | The robot has an error. | Checks |
| Power indicator light white | The battery level is 20% or more. | Checks |
| Power indicator light red | The battery level is below 20%. | Checks |
| Power indicator light pulsing | The robot is charging or starting up. | Checks |
| Dock status indicator light pulsing | The dock is emptying the dustbin or washing the mop. | Checks |
| Dock status indicator light off | The dock is powered off, charging the robot or drying the mop. | Checks |
| WiFi indicator off | WiFi is disabled. | Checks |
| WiFi indicator flashing slowly | The robot is waiting for a WiFi connection. | Checks |
| WiFi indicator flashing quickly | The robot is connecting to WiFi. | Checks |
| WiFi indicator steady | The robot is connected to WiFi. | Checks |
Roborock codes on other models
Error 4
Error 4. Roborock's checks for Error 4: wipe the cliff sensors and keep the robot off dark or shag carpet.
- Wipe the cliff sensors.
- Make sure the robot is not on dark or shag carpet.
Source Source: Error 4, p. 1
Error 5
Error 5. Roborock's checks for Error 5: look for anything tangled in the main brush, its two installation slots and both ends, then run the robot with Carpet mode enabled.
- Check that nothing is tangled in the main brush, including inside the two brush installation slots and at either end of the brush.
- Run the robot with Carpet mode enabled and check whether the problem is resolved.
Source Source: Error 5, p. 1
Error 7
Error 7. Roborock's check for Error 7: press and spin the wheels by hand to see whether they are stuck.
- Press and spin the wheels manually to check whether they are stuck.
- If a wheel is stuck, try to free it.
Source Source: Error 7, p. 1
Error 9
Error 9. Roborock's check for Error 9: look for the magnet on the side of the filter.
- Look for the magnet on the side of the filter.
- If there is no magnet, replace the filter and try again.
Source Source: Error 9, p. 1
Error 10
Error 10. Roborock's fix for Error 10: clean the filter, dry it thoroughly and put it back in the robot.
- Clean the filter, dry it thoroughly, place it back in the robot and try again.
Source Source: Error 10, p. 1
Error 13
Error 13. Roborock's checks for Error 13: charging contacts, the dock's indicator light, the power cable connection and a 2-minute unplug.
- If the charging contacts on the dock or underneath the robot have stains or rust, remove them with a cloth moistened with alcohol solution or with an eraser.
- Check that the dock charger works: the dock's indicator light is solid on without the robot and off with the robot placed on it.
- Check that the cable and the slot of the dock are well connected, pushing the cable head firmly into the slot at the bottom of the dock.
- Unplug the charging dock, leave it for about 2 minutes, plug it back in and try again.
Source Source: Error 13, p. 1
Error 18
Error 18. Roborock's fix for Error 18: clap the side of the robot several times to clear debris from the fan.
- Clap the side of the robot several times to try to clear debris from the fan.
Source Source: Error 18, p. 1
Power indicator light flashing red
Power indicator light on the robot flashing red. The robot has an error.
Power indicator light white
Power indicator light white. The battery level is 20% or more.
Power indicator light red
Power indicator light red. The battery level is below 20%.
Power indicator light pulsing
Power indicator light pulsing. The robot is charging or starting up.
Dock status indicator light pulsing
Status indicator light on the dock pulsing. The dock is emptying the dustbin or washing the mop.
Dock status indicator light off
Status indicator light on the dock off. The dock is powered off, charging the robot or drying the mop.
WiFi indicator off
WiFi indicator off. WiFi is disabled.
WiFi indicator flashing slowly
WiFi indicator flashing slowly. The robot is waiting for a WiFi connection.
WiFi indicator flashing quickly
WiFi indicator flashing quickly. The robot is connecting to WiFi.
WiFi indicator steady
WiFi indicator steady. The robot is connected to WiFi.
Problems
- The robot will not power on2 causes in the manual. First: the battery level is low.
- The robot will not charge2 causes in the manual. First: the dock may not be receiving power.
- The robot charges slowly2 causes in the manual. First: the robot automatically reduces its charging speed at high or low temperatures to extend battery life.
- The robot cannot dock2 causes in the manual. First: there are too many obstacles near the charging dock.
- The robot behaves abnormallyThe robot behaves abnormally without showing an error.
- The robot is noisy during cleaning2 causes in the manual. First: the main brushes, side brush, main wheels or omnidirectional wheel may be jammed.
- The robot cannot connect to WiFi5 causes in the manual. First: wiFi is disabled.
- Poor cleaning ability or dust falling out3 causes in the manual. First: the dustbin is full.
- Scheduled cleaning is not workingThe battery level is low; scheduled cleaning can only begin when the battery level is above 20%.
- No or little water during moppingThe water tank may be empty, or the scrub intensity or the mop installation needs checking.
- Cleaning does not resume after recharging2 causes in the manual. First: the robot is in DND mode, which prevents cleanup.
- The robot cannot return to the dock after spot cleaning or being movedAfter spot cleaning or a significant position change the robot regenerates the map; if the dock is too far away it may not return to recharge.
- The robot misses certain spotsThe wall sensor or cliff sensors may be dirty.
- Reduced emptying performance or unusual noise when emptying2 causes in the manual. First: the main brushes or main brush cover are not properly installed.
- Reduced mop washing performance2 causes in the manual. First: the mop is not attached properly.
- Auto-emptying is not working4 causes in the manual. First: auto-emptying is disabled.
- The mop is not washed4 causes in the manual. First: the mop is not used, so it is not washed.
- Poor drying effect3 causes in the manual. First: auto Drying is disabled in the app.
The robot behaves abnormally
The robot behaves abnormally without showing an error. Source: Common Issues, p. 14
- Restart the robot.
Scheduled cleaning is not working
The battery level is low; scheduled cleaning can only begin when the battery level is above 20%. Source: Common Issues, p. 14
- Keep the robot charged.
No or little water during mopping
The water tank may be empty, or the scrub intensity or the mop installation needs checking. Source: Common Issues, p. 14
- Check whether there is water in the water tank and use the mobile app to set the scrub intensity.
- Check the manual for how to install the mop cloth and mop mount correctly.
The robot cannot return to the dock after spot cleaning or being moved
After spot cleaning or a significant position change the robot regenerates the map; if the dock is too far away it may not return to recharge. Source: Common Issues, p. 15
- Place the robot on the charging dock manually.
The robot misses certain spots
The wall sensor or cliff sensors may be dirty. Source: Common Issues, p. 15
- Wipe them with a soft dry cloth.
The robot draws power while on the dock
The robot draws power while docked to maintain battery performance, but power consumption is minimal. Source: Common Issues, p. 14
The robot needs charging for 16 hours before the first uses
No. The robot can be used any time after it has been fully charged. Source: Common Issues, p. 14
How-to
- How to reset the WiFi connectionWhen the robot cannot connect to the app or must be added as a new device.
- How to reset the robot systemWhen the robot does not respond to a button press or cannot be turned off.
- How to restore the robot to factory settingsWhen the robot does not work properly after a system reset.
- How to fill the clean water tankBefore mopping.
- How to clean the main brushesEvery 2 weeks.
- How to clean the side brushMonthly.
- How to clean the omni-directional wheelAs required.
- How to empty and clean the dustbinAs required.
- How to clean the washable filterEvery 2 weeks.
- How to clean the VibraRise mop clothAfter each use.
- How to clean the robot sensorsAs required.
- How to clean the charging contactsAs required.
- How to empty and clean the dirty water tankAs required.
- How to clean the high-speed maintenance brushAs required.
- How to clean the water filterAs required.
- How to replace the disposable dust bagWhen the dust bag is full.
Maintenance
Settings
| Setting | Options | Default | Notes | Source |
|---|---|---|---|---|
| Do Not Disturb (DND) mode | Disable or change the period in the app | 22:00 to 08:00 | The robot does not automatically resume cleanup, the power indicator light dims and the voice prompt volume lowers. | Source: Instructions: DND Mode, p. 10 |
| Child lock | Press and hold the Mop Only/Child Lock button for 3 seconds, or set it in the app | The robot does not react to button presses while stationary; while cleaning or docking, any button still stops it. | Source: Instructions: Child Lock, p. 11 | |
| Auto-emptying | On or off in the app | Emptying begins automatically when the robot returns to the dock after cleaning; press the Dock button on the docked robot or tap Empty in the app to empty manually. | Source: Instructions: Emptying, p. 10 | |
| Auto drying | On or off in the app; drying duration can be changed in the app | Drying starts automatically after mop washing or after cleaning is completed; tap the Drying button in the app to start or stop it manually. | Source: Instructions: Drying, p. 10 |
Parts and consumables
| Item | Replace or refill | Specification | Source |
|---|---|---|---|
| Main brushes | Every 6-12 months | Pair of brushes under the main brush cover. | Source: Routine Maintenance: Main Brushes, p. 11 |
| Side brush | Every 3-6 months | Brush held by one screw. | Source: Routine Maintenance: Side Brush, p. 11 |
| Washable filter | Every 6-12 months | Filter under the dustbin filter cover. | Source: Routine Maintenance: Washable Filter, p. 12 |
| VibraRise mop cloth | Every 3-6 months | Mop cloth on the VibraRise mop mount. | Source: Routine Maintenance: VibraRise Mop Cloth, p. 12 |
| High-speed maintenance brush | Every 6-12 months | Brush in the dock, held by a latch. | Source: Routine Maintenance: High-Speed Maintenance Brush, p. 12 |
| Disposable dust bag | – | Bag in the dock dustbin; replace when full. | Source: Routine Maintenance: Replacing the Disposable Dust Bag, p. 13 |
| Roborock branded floor cleaner | – | The only cleaner to use in the clean water tank. | Source: Instructions: Filling the Clean Water Tank, p. 9 |
Specifications
The FCC user manual covers the Roborock S8 Pro Ultra, robot model S81USP, with an Empty Wash Fill Dock model EWFD07LRR or EWFD08LRR. Source: Basic Parameters, p. 13
An error shows as a flashing red power indicator light on the robot or a steady red status indicator light on the dock, with an app pop-up and possibly a voice alert. Source: Instructions: Error, p. 11
The manual's Common Issues table names one numbered error, Error 42 for the maintenance brush; Roborock's support articles cover errors 4, 5, 7, 9, 10, 13 and 18. Source: Common Issues, p. 15
A robot left in a malfunctioning state for over 10 minutes goes to sleep, and placing it on the dock manually ends the current cleanup. Source: Instructions: Error, p. 11
| Battery | 14.4V/5200mAh (TYP) lithium-ion battery | Source: Basic Parameters, p. 13 |
|---|---|---|
| Charging time | Approx. 4 hours | Source: Basic Parameters, p. 13 |
| Robot rated input | 20V 1.5A | Source: Basic Parameters, p. 13 |
| Dock rated input | 120V~, 60Hz; 9.5A during dust collection, 1.2A otherwise | Source: Basic Parameters, p. 13 |
| WiFi | 2.4 GHz only | Source: Connecting to the App: Reset WiFi, p. 9 |
| Operating temperature | 4-40°C (39-104°F) | Source: Common Issues, p. 14 |
| Serial number | On a sticker on the underside of the robot | Source: Basic Parameters, p. 13 |
Recalls
No exact-model match for S8 Pro Ultra, S81USP in the U.S. Consumer Product Safety Commission recall database, checked . Recalls can name model families, so also check current recalls for Roborock.
Sources
- Roborock S8 Pro Ultra FCC EN User Manual (EN/FR/ES). Beijing Roborock Technology Co., Ltd. Document S81USP, revision Undated download (PDF created 2023-03-14), 15 pages, en. support.roborock.com. Listed on the manufacturer's support page. Retrieved 13 November 2026.
- What should I do when error 4 occurs?. Beijing Roborock Technology Co., Ltd. Document Article 360035369132, revision Undated web article, 1 pages, en. support.roborock.com. Listed on the manufacturer's support page. Retrieved 13 November 2026.
- What should I do when error 5 occurs?. Beijing Roborock Technology Co., Ltd. Document Article 360035369172, revision Undated web article, 1 pages, en. support.roborock.com. Listed on the manufacturer's support page. Retrieved 13 November 2026.
- What should I do when error 7 occurs?. Beijing Roborock Technology Co., Ltd. Document Article 360035369212, revision Undated web article, 1 pages, en. support.roborock.com. Listed on the manufacturer's support page. Retrieved 13 November 2026.
- What should I do when error 9 occurs?. Beijing Roborock Technology Co., Ltd. Document Article 360035731551, revision Undated web article, 1 pages, en. support.roborock.com. Listed on the manufacturer's support page. Retrieved 13 November 2026.
- What should I do when error 10 occurs?. Beijing Roborock Technology Co., Ltd. Document Article 360035731571, revision Undated web article, 1 pages, en. support.roborock.com. Listed on the manufacturer's support page. Retrieved 13 November 2026.
- What should I do when error 13 occurs?. Beijing Roborock Technology Co., Ltd. Document Article 360035369312, revision Undated web article, 1 pages, en. support.roborock.com. Listed on the manufacturer's support page. Retrieved 13 November 2026.
- What should I do when error 18 occurs?. Beijing Roborock Technology Co., Ltd. Document Article 360035731631, revision Undated web article, 1 pages, en. support.roborock.com. Listed on the manufacturer's support page. Retrieved 13 November 2026.
Page numbers are the numbers printed in the manual. Where this page and the manual differ, follow the manual.
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