If your Roborock S6 Pure stops mid-clean and displays error 43, you're dealing with a water supply issue in the mopping system. This error specifically indicates that the robot cannot detect water flow to the mop pad, which prevents the mopping function from working properly. While this error won't affect vacuum-only cleaning, it does mean your robot can't mop until resolved. The good news is that most Roborock S6 Pure error 43 cases can be fixed at home without professional tools. Follow this guide to diagnose and resolve the issue step by step.
What Causes Roborock S6 Pure Error 43?
Error 43 on the Roborock S6 Pure typically stems from one of several common issues: an empty or improperly installed water tank, clogged water outlets, a malfunctioning water pump, or debris blocking the mop mount sensors. Understanding the root cause helps you apply the right fix and prevent recurrence.
How to Fix Roborock S6 Pure Error 43
1
Check and Refill the Water Tank: Remove the water tank from the rear of your S6 Pure and verify it contains clean water. Fill it to the indicated maximum line—overfilling can cause pressure issues, while underfilling triggers the sensor. Ensure the tank cap is sealed tightly and the rubber gasket is seated properly. Reinsert the tank until you hear a firm click.
2
Inspect Water Tank Installation: The tank must sit flush against the robot's body. Check for debris on the contact points where the tank meets the main unit. Wipe these surfaces with a dry microfiber cloth. If the tank wobbles or feels loose, remove and reinstall it, pressing firmly until both locking tabs engage.
3
Clean the Water Outlets and Nozzles: Turn the robot upside down and locate the small water outlets near the mop bracket. Use a soft-bristled brush or toothpick to gently clear any mineral buildup or dust. Run warm water through the tank's outlet valves to confirm water flows freely. Hard water deposits are a frequent cause of Roborock S6 Pure error 43 in households with high mineral content.
4
Examine the Mop Mount and Sensors: Detach the mop bracket completely. Clean the metal contact pins on both the robot and the bracket with a slightly damp cloth, then dry thoroughly. Check the two small hall effect sensors on the robot body for obstruction—these detect whether the mop is properly attached. A misaligned or damaged bracket can falsely trigger error 43.
5
Test the Water Pump Manually: Start a targeted mopping session via the Roborock app and listen closely. You should hear a faint buzzing sound from the pump attempting to move water. Silence suggests pump failure. As a manual check, remove the tank, cover the outlet with your finger, and squeeze the tank firmly—water should resist and then release in a small jet. No resistance indicates an internal seal or pump diaphragm problem.
6
Reset and Update Firmware: If hardware checks pass, perform a soft reset by holding the power and home buttons simultaneously for 5 seconds until the voice prompt confirms. Open the Roborock app, navigate to Settings > Firmware Update, and install any available updates. Firmware glitches occasionally cause false error 43 reports, particularly after app updates.
⚠️ Important: Never use cleaning solutions, essential oils, or vinegar in your Roborock S6 Pure water tank. These substances degrade internal seals, clog the precision pump, and void your warranty. Use only clean tap or distilled water. If you previously used additives, flush the entire system three times with distilled water before resuming normal operation.
Preventing Future Error 43 Occurrences
Regular maintenance keeps your mopping system reliable. Empty the water tank after each use to prevent stagnant water and mineral accumulation. Weekly, rinse the tank and wipe the outlet valves. Monthly, run a distilled water cycle through the system to dissolve early buildup. For homes with hard water, consider using distilled water exclusively—this single change dramatically reduces Roborock S6 Pure error 43 frequency.
Frequently Asked Questions
Does error 43 prevent the S6 Pure from vacuuming?
No. Error 43 only disables the mopping function. You can continue using your robot for vacuum-only cleaning by removing the mop bracket entirely or selecting vacuum-only mode in the app.
How do I know if my water pump needs replacement?
If you've completed all cleaning steps, confirmed proper tank installation, and still hear no pump activation during mopping, the pump likely requires replacement. This is a repair best handled by certified technicians, as it involves disassembling the robot's internal components.
Why does error 43 return after I fix it temporarily?
Recurring Roborock S6 Pure error 43 usually indicates hard water deposits building faster than you're cleaning them, a degrading rubber seal on the tank, or a failing pump that works intermittently. Switch to distilled water and inspect the tank gasket for cracks or hardening.
Still Need Help With Your Roborock Device?
If these steps didn't resolve the error 43 issue, our certified technicians can help.