If your eufy station won’t wash the mop, leaves it wet or smelly, or shows a red light, these are the checks from eufy’s manuals for its self-washing Omni stations.

What This Problem Means

The station needs clean water, an empty dirty tank, both tanks properly seated and a clean tray to wash the mop. The E28 and C28 manuals say the station won’t work normally if the tanks aren’t locked in, and on some models the station light turns red to warn you.

Common Symptoms

• The mop isn’t washed, or stays dirty
• The mop smells or stays damp
• The station light is red
• The S1 Pro reports “Dirty water tank is full” or “Abnormal clean water level”

Safe Checks You Can Try

1. Fill the clean tank and empty the dirty tank

Fill the clean water tank to the MAX line with clean water. The X10 Pro Omni, E35, E28, C28, C30, C30 Edge and C20 manuals say not to use hot water because it shortens the tank’s service life, and the S1 Pro manual says hot water may damage the device. Empty and rinse the dirty water tank; eufy says to do this regularly to stop mildew and smells. On the C20, the light ring in the clean water tank turns red when the tank is empty.

2. Lock both tanks in

The E28 and C28 manuals say both tanks must be securely locked, or the station won’t work normally. On the C30 and C30 Edge, the station light turns red if the clean water tank is empty or either tank isn’t seated.

3. Clean the tray

Take out the station’s cleaning tray (the filter tray on the S2, S1 Pro and E35), rinse it with water and put it back (on the S1 Pro, clear it with the supplied cleaning tool and let it air-dry instead). On the C28, C30 and C30 Edge, press it down on both sides until it clicks. On the S2, C28, C30 and C30 Edge, the station light turns from red to white once the tray is fitted correctly. eufy’s tables say to clean it every 2 weeks on the E28 and E25, every 30 hours on the C28 and S1 Pro, and every 2 to 3 months on the C30 and C30 Edge.

4. Don’t add other cleaners

The X10 Pro Omni manual says to use only the cleaning solution eufy designates, and the C28 manual says not to add non-eufy cleaning solutions or home-made cleaning liquids. The S1 Pro manual says not to add third-party disinfectants or cleaning agents to the water tank, and the shared C30 / C30 Edge manual says not to add floor cleaners, chemicals, disinfectants or any other additives to it.

5. Turn on drying after mopping

To stop the mop smelling, the S2, E25, C28, C30 and C30 Edge manuals say to turn on drying after every mopping task and to set it to Standard Drying. The E35 manual says drying takes about 3.5 to 7 hours, depending on the mode. On the S2 and C28, when the room is above 35°C the robot charges first and the station dries with room-temperature air until it is fully charged.

6. Fix the S1 Pro’s water messages

For “Dirty water tank is full”, the S1 Pro manual’s FAQ says to check the dirty tank is empty and its lid is secure, clean the tray, and clean the robot’s water sink and sink filter.

For “Abnormal clean water level”, the manual’s FAQ gives the likely cause as bubbles in the robot’s clean water tank: turn the robot over vertically through 360 degrees, then put it back on the station. For a smell, it says to clean the scraper and filter with the cleaning tool, soak the rolling mop in hot water and refit it, run a mop wash and dry the mop before the next clean.

Water tanks and drying by model

The Robot Vacuum C10 doesn’t mop, so this guide doesn’t apply to it.

When To Contact Support

If none of these checks fix it, contact eufy at support@eufy.com or through eufy’s support site, with your robot’s model. eufy’s UK phone number, printed in most of its manuals, is +44 (0) 1604 936 200.