Roborock S8 Pro Ultra (S81USP) dock status indicator light steady red
Status indicator light on the dock steady red. The dock has an error.
Cause 1 of 5The dustbin or dust bag is not in place. Source: Common Issues, p. 15
First checkCheck and correct the installation.
Causes and checks
The dustbin or dust bag is not in place. Source: Common Issues, p. 15
- Check and correct the installation.
Voltage error. Source: Common Issues, p. 15
- Check that the local voltage meets the requirements listed on the dock.
Clean water tank placement or water level. Source: Common Issues, p. 15
- Check the clean water tank placement or refill it as required.
Dirty water tank placement or fill level. Source: Common Issues, p. 15
- Check the dirty water tank placement or empty it as required.
Water filter installation. Source: Common Issues, p. 15
- Check that the water filter has been correctly installed.
All 5 causes checked. Contact the manufacturer.
Other S8 Pro Ultra (S81USP) indicators
- Error 4: Roborock's checks for Error 4: wipe the cliff sensors and keep the robot off dark or shag carpet.
- 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.
- Error 7: Roborock's check for Error 7: press and spin the wheels by hand to see whether they are stuck.
- Error 9: Roborock's check for Error 9: look for the magnet on the side of the filter.
- Error 10: Roborock's fix for Error 10: clean the filter, dry it thoroughly and put it back in the robot.
- Error 13: Roborock's checks for Error 13: charging contacts, the dock's indicator light, the power cable connection and a 2-minute unplug.
- Error 18: Roborock's fix for Error 18: clap the side of the robot several times to clear debris from the fan.
- Error 42: maintenance brush jammed: The high-speed maintenance brush in the dock is jammed; the robot announces it by voice alert.
- Power indicator light flashing red: The robot has an error.
- Power indicator light white: The battery level is 20% or more.
- Power indicator light red: The battery level is below 20%.
- Power indicator light pulsing: The robot is charging or starting up.
- Dock status indicator light pulsing: The dock is emptying the dustbin or washing the mop.
- Dock status indicator light off: The dock is powered off, charging the robot or drying the mop.
- WiFi indicator off: WiFi is disabled.
- WiFi indicator flashing slowly: The robot is waiting for a WiFi connection.
- WiFi indicator flashing quickly: The robot is connecting to WiFi.
- WiFi indicator steady: The robot is connected to WiFi.
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.