Robotic Pool Cleaner Not Climbing Walls? 7 Fixes That Work

When a robot stops climbing, the cause is almost always one of a few simple things: not enough suction, not enough grip, or a setting. These checks apply to every brand. Do them in order; the first three fix most cases.

Tip: Unplug a corded robot's power supply, or switch a cordless robot off, before handling it. Never handle a power supply with wet hands.

1. Check that your robot is meant to climb

Some robots clean the floor only, such as the Aiper Scuba SE, WYBOT A1 and Dolphin E10. If yours is floor-only, it isn't broken. Check the specs on your model's page.

2. Check the cleaning mode

Most robots have a floor-only mode, and some apps remember it. Switch to the full or floor-and-wall mode. Dolphin's guidance also points to app or quick-mode settings that skip walls.

3. Empty and rinse the filter

A full or clogged filter is the most common cause. Robots climb by suction: water pulled through the filter holds them against the wall. When the filter is full, suction drops and the robot slides off. Aiper, Beatbot, Polaris and Hayward guidance all start here.

• Empty the basket after every cycle.
• Rinse fine filters from the inside out with a hose; don't use soap.
• Replace filters that stay clogged after rinsing.

4. Brush the walls

Algae, biofilm and sunscreen residue make walls slippery even when the water looks clear. Beatbot notes this happens more in sunny and saltwater pools, and Aiper adds that smooth fiberglass and tile give less grip. Brush the walls and waterline firmly, then run the robot again.

5. Check the water chemistry

Low chlorine lets biofilm build up again quickly. Keep sanitizer and pH in range so walls stay grippy.

6. Inspect brushes, tracks and wheels

Brushes and tracks wear smooth or harden over time. Look for:

• smooth, shiny or cracked rubber;
• loose or stretched tracks and belts;
• hair or string wrapped around rollers.

Replace worn parts. Most brands sell brushes and tracks separately.

7. Give it time

Many robots clean the floor first. Pool Dial notes some map the floor for up to about 30 minutes before the first climb and leave the wall now and then to re-map. Watch a full cycle before deciding it isn't climbing.

Still not climbing?

If none of these help, the pump motor may be weak or the impeller damaged. Contact the maker with your serial number and what you have tried; it may be covered by warranty. If it's out of warranty and the repair costs a lot, compare it with a new robot in our best cordless robots.