Roborock S8 Pro Ultra (S81USP) how to fill the clean water tank
Before mopping.
Steps
- Open the clean water tank and fill it with water.
- Close the lid, lock the latch and fit the tank back in place.
Use only the Roborock branded floor cleaner in the water tank to prevent corrosion or damage. Do not put hot water in the tank. Wipe water marks off the tank before reinstalling it.
Source: Instructions: Filling the Clean Water Tank Source: Instructions: Filling the Clean Water Tank, p. 9
Other S8 Pro Ultra (S81USP) procedures
- 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 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.
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.