Roborock mop not working
DIRECT ANSWER
Mop symptoms by model
| What you notice | What it shows and doesn't show | Next safe check | Source |
|---|---|---|---|
| S5 pad stays dry with water in the tank | Water isn't reaching the pad. Fitting, pad preparation or the filters could be the cause. | Refit the tank, wet and wring the pad, then check the filter age | Roborock S5 user manual |
| S5 Max or S7 app says the mop isn't installed | The robot isn't detecting the module. It doesn't prove the mount is broken. | With the robot off, slide the tank and mount in until they click | Roborock S7 user manual |
| S7 stops vibrating or shows Error 27 | The manual ties Error 27 to a jammed VibraRise system. Other models have their own codes. | Switch off and clear debris visible from outside, without forcing the mount | Roborock S7 user manual |
| Qrevo Series pads are wet but don't rotate | Rotation is a separate problem from water supply. | Check that the mop shafts are clipped in and the pads lie flat | Roborock Qrevo Series user manual |
| S8 Pro Ultra dock skipped the wash | That task may not have included mopping. It doesn't point to a pump fault. | Confirm mopping ran, then read the app message if the dock light is red | Roborock support: dock doesn't wash the mop |
| Q5 Pro+ leaves little water on the floor | Flow is set with a control on the tank itself, not in an app menu as on the S5 Max. | Check the tank's flow control before suspecting a fault | Roborock Q5 Pro+ user manual |
COMMON CAUSES · RANKED
Tank, mount or pad not fully seated MOST COMMON
On the S5 Max and S7, the tank and mop mount have to click into their slots. If one hasn't locked, water may not reach the pad, or the app may say the mop isn't installed.
Tank empty or water setting too low
Check the tank level first. On the S5 Max, flow is set in the app, so a low setting can look like a fault.
Dock skipped the wash
With the Empty Wash Fill Dock, S8 Pro Ultra and S7 Max Ultra, the dock won't wash the pad if mopping wasn't used in that task.
S5 water filter elements blocked or overdue UNCOMMON
The S5 tank uses two replaceable filter elements. If fitting and water level check out but the pad stays dry, look at the filters next. A dry pad on its own doesn't prove they have failed.
VibraRise mechanism obstructed UNCOMMON
The S7 manual ties Error 27 to a jammed VibraRise system. Vibration can stop while water is still flowing.
HOW TO FIX IT
Confirm the model and its mop design
Read the model label first. The original Q5 and Q5+ have no mopping system at all. The others differ: the S5 uses a filter-fed tank, the S5 Max sets flow in the app, and the S7 and S8 Pro Ultra use VibraRise.
Reseat the parts with the robot off
On the S5 Max and S7, take out the tank and mop mount and slide each back until it clicks. The S8 Pro Ultra mount is fixed, so just reattach the pad flat.
Check water level and flow setting
Fill the tank and make sure it is fully seated. On the S5 Max, also check the flow setting in the app and that the whole assembly is in place.
If the mop stops moving, stop the task
If vibration stops or an S7 shows Error 27, switch the robot off. Remove any hair or debris around the mount that you can reach from outside, without forcing the mechanism.
If the dock doesn't wash, check the task and dock
Make sure that run actually included mopping, and that the dock's water tanks and filter are fitted. If the S8 Pro Ultra dock indicator is red, the app message gives the specific cause.
IF IT STILL FAILS
WHEN TO STOP
Stop and contact Roborock support if a jam error returns after you clear what you can see, a tank or mount latch won't lock, water leaks inside the robot or dock, or you notice a burning smell, unusual heat or damaged cables. Give support the exact model and any error code.
COMPATIBLE PARTS
As an Amazon Associate, RoboFaults earns from qualifying purchases. Prices are shown on the retailer's site.
Water tank filter — S5
Original S5 tank only, when fitting and water level are confirmed and the pad still gets little water. The manual suggests replacing both filter elements every 1 to 3 months. Compare the filter shape with your tank before buying. Not for the S5 Max, S7 or S8 Pro Ultra. Source
Compatibility and replacement details → Check price on Amazon ↗
VibraRise mop cloth, 2-pack — S7
For S7 or S7 MaxV models listed on Roborock's product page, when a washed pad is torn, worn or won't lie flat. A dry pad alone isn't a reason to replace it. Not confirmed for the S8 Pro Ultra. Source
Compatibility and replacement details → Check price on Amazon ↗MODELS AFFECTED
| Model | Status | Firmware | Parts | Verified |
|---|---|---|---|---|
| Roborock S5 The tank feeds water through two replaceable filter elements, and the manual has no app water setting. Wet the pad and wring it until it stops dripping before fitting it. · Source | limited | s5 | Parts → | 2026-07-05 · Source |
| Roborock S5 Max The tank and mop mount install separately, and water flow is set in the app. The manual's checks are the tank level, the app setting and full assembly. · Source | limited | s5 | Parts → | 2026-07-05 · Source |
| Roborock S7 Uses an Electric Water Tank and a removable VibraRise mount, with vibration intensity set in the app. The manual defines Error 27 as a jammed VibraRise system. · Source | active | s7 | Parts → | 2026-07-05 · Source |
| Roborock S8 Pro Ultra The VibraRise mount is non-detachable. Only the pad comes off for washing. The robot has a self-filling port and pairs with a mop-washing dock. · Source | active | s8 | Parts → | 2026-07-05 · Source |
Models resolved from the series chips above. Support status comes from our EOL library; rows link to the matching parts and firmware pages.
FIELD NOTES
Most of these observations narrow the search without confirming a failed part. A dry pad tells you water isn't arriving, not whether the setting, tank, filters or pad is to blame. A not-installed message means the robot can't detect the module; the mount may be fine. Water moving through the dock during self-cleaning belongs to the dock's wash path, which is a different route from the robot's floor supply.
The designs are different. The S5 feeds water through tank filters, the S5 Max sets flow in the app, the S7 has a removable VibraRise mount, and the S8 Pro Ultra mount is fixed. Qrevo details here come from one Qrevo Series manual and may not match every Qrevo. This page does not cover the base S8, S6, S7 MaxV or Q7 variants; use their own manuals.
FAQ · REAL QUESTIONS
My Q5 has no mop option. Is something broken?
Not if it's the original Q5 or Q5+. Its manual covers vacuuming only, with no mop or water tank. Some later models with Q5 in the name, such as the Q5 Pro+, do mop, so check the exact model label.
Can I remove the mop mount on the S8 Pro Ultra to reseat it?
No. The manual states the VibraRise mount is non-detachable. Only the pad comes off; wash it and reattach it flat. Prying at the mount risks damaging it.
Water moved through the dock during self-cleaning. Does that prove the robot's water supply works?
No. The dock's wash path is separate from the robot's floor water supply. Water moving through the dock does not confirm that water reaches the robot's pad.
Can I add cleaning solution to the water tank?
It depends on the model. The S5 Max manual warns against cleaning fluid and disinfectant in the tank, while some newer manuals allow Roborock-approved solutions only. Follow your model's manual and the product label, and skip homemade mixtures.
My S7 shows Error 27. Does that code mean the same on other models?
The S7 manual defines Error 27 as a jammed VibraRise system. Other models may use the code differently, so check your own manual's error list or the app message.
Should I buy new mop cloths if the pad stays dry?
Not for that reason alone. A dry pad points to water supply or fitting. Replace the cloth once flow and installation are confirmed and the washed pad is torn, worn or won't lie flat.
Sources
- Roborock S5 user manual
- Roborock S5 Max user manual
- Roborock S5 Max product page
- Roborock S7 user manual
- Roborock S8 Pro Ultra user manual
- Roborock Qrevo Series user manual
- Roborock Q5 user manual
- Roborock Q5 product page
- Roborock Q5 Pro+ user manual
- Roborock support: dock doesn't wash the mop
- Roborock mop cloth 2-pack for S7/S7 MaxV series
Corrections
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