Roborock S8 Pro Ultra (S81USP) the robot cannot connect to WiFi

Cause 1 of 5WiFi is disabled. Source: Common Issues, p. 14

First checkReset the WiFi and try again.

Causes and checks

WiFi is disabled. Source: Common Issues, p. 14
1. Reset the WiFi and try again.
The WiFi signal is poor. Source: Common Issues, p. 14
1. Move the robot to an area with good WiFi reception.
The WiFi connection is abnormal. Source: Common Issues, p. 14
1. Reset the WiFi, download the latest mobile app and retry.
The current Roborock robot is not supported by the app. Source: Common Issues, p. 14
1. Find the supported models in the app.
The router settings may have an error. Source: Common Issues, p. 14
Manufacturer service Contact Roborock customer service for additional support.

Other S8 Pro Ultra (S81USP) 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.
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.

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.

Applies to: S8 Pro Ultra (variants S81USP; EWFD07LRR; EWFD08LRR). United States (FCC edition).
Source: Roborock S8 Pro Ultra FCC EN User Manual (EN/FR/ES), S81USP revision Undated download (PDF created 2023-03-14); What should I do when error 4 occurs?, Article 360035369132 revision Undated web article; What should I do when error 5 occurs?, Article 360035369172 revision Undated web article; What should I do when error 7 occurs?, Article 360035369212 revision Undated web article; What should I do when error 9 occurs?, Article 360035731551 revision Undated web article; What should I do when error 10 occurs?, Article 360035731571 revision Undated web article; What should I do when error 13 occurs?, Article 360035369312 revision Undated web article; What should I do when error 18 occurs?, Article 360035731631 revision Undated web article
Last verified: 13 November 2026
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