A stuck S1 is usually caused by debris lodged in the rear drive wheel or a tangle in the brush roll.
A stuck S1 is usually caused by debris in the drive wheel, ladder/step entrapment, or getting beached on a drain cover. Remove from the pool and check for physical obstructions first. Under a ladder? Set an exclusion zone in the app. Enable Obstacle Avoidance to reduce recurrence. Wall-climb looping? Try a factory reset and firmware update.
Drive wheel debris removal
Power off the robot. Flip upside down. Locate the rear wheel housings and use a soft pick or toothpick to remove stones, leaf stems, or compacted debris from around the axle. Rotate each wheel manually to confirm free movement.
How to enable Obstacle Avoidance
Aiper app → Scuba S1 → Settings → Navigation → Obstacle Avoidance → toggle On. This activates the ultrasonic proximity sensor to detect and navigate around obstructions proactively.
Setting up exclusion zones
In the app → Scuba S1 → Pool Map → Exclusion Zones. Draw a zone over the problem area (steps, shallow end, fountain). The robot will avoid that region during all future scheduled cycles.
Robot Stuck Under Pool Ladder or Steps
This is the most commonly reported entrapment scenario. Pool ladders with vertical legs create a gap that the S1 can enter but not exit. Fix: (1) In the Aiper app, go to Scuba S1 → Pool Map → Exclusion Zones and draw a zone around the ladder area. (2) If your ladder has removable bumpers, ensure they are installed — they reduce the gap width. (3) For above-ground pools with A-frame ladders, consider adding a pool ladder mat or guard barrier to physically block the gap. (4) As a temporary fix, lower the water level by 2–3 inches — the S1’s buoyancy changes and it may avoid the ladder gap at a slightly different water depth.
Robot Climbs Wall Then Stops and Falls Repeatedly
If the S1 climbs to the waterline, stops, drops back down, then immediately climbs the same spot again in a loop: this is usually a sensor calibration issue or a slippery wall surface. (1) Remove the robot from the pool and perform a factory reset (hold power 10 seconds until LED flashes). (2) Check if your pool walls are vinyl or fiberglass — very smooth surfaces reduce traction. The S1’s wall-climbing algorithm may misread the waterline on these surfaces. (3) If the behavior only happens on one specific wall section, that section may have a subtle curve or return jet pushing the robot off — use Exclusion Zones to skip it. (4) Update firmware to the latest version via the Aiper app — newer firmware includes improved wall-climbing logic.
Robot Stuck in Corners or on Drain Covers
Corners and raised drain covers can trap the S1 if the turning radius is too tight. (1) For corners: enable Obstacle Avoidance in the app (Scuba S1 → Settings → Navigation). The ultrasonic sensor detects walls earlier and starts turning sooner. (2) For main drain covers: if the drain cover protrudes more than 1 inch above the pool floor, the S1 may beach on it. Mark the drain area as an exclusion zone. (3) For irregular corners (e.g. Grecian or L-shaped pools): switch to Auto mode rather than Floor mode — Auto mode adapts the cleaning path to non-rectangular shapes.
Robot Stuck Under Pool Ladder or Steps
This is the most commonly reported entrapment scenario. Pool ladders with vertical legs create a gap that the S1 can enter but not exit. Fix: (1) In the Aiper app, go to Scuba S1 → Pool Map → Exclusion Zones and draw a zone around the ladder area. (2) If your ladder has removable bumpers, ensure they are installed — they reduce the gap width. (3) For above-ground pools with A-frame ladders, consider adding a pool ladder mat or guard barrier to physically block the gap. (4) As a temporary fix, lower the water level by 2–3 inches — the S1’s buoyancy changes and it may avoid the ladder gap at a slightly different water depth.
Robot Climbs Wall Then Stops and Falls Repeatedly
If the S1 climbs to the waterline, stops, drops back down, then immediately climbs the same spot again in a loop: this is usually a sensor calibration issue or a slippery wall surface. (1) Remove the robot from the pool and perform a factory reset (hold power 10 seconds until LED flashes). (2) Check if your pool walls are vinyl or fiberglass — very smooth surfaces reduce traction. The S1’s wall-climbing algorithm may misread the waterline on these surfaces. (3) If the behavior only happens on one specific wall section, that section may have a subtle curve or return jet pushing the robot off — use Exclusion Zones to skip it. (4) Update firmware to the latest version via the Aiper app — newer firmware includes improved wall-climbing logic.
Robot Stuck in Corners or on Drain Covers
Corners and raised drain covers can trap the S1 if the turning radius is too tight. (1) For corners: enable Obstacle Avoidance in the app (Scuba S1 → Settings → Navigation). The ultrasonic sensor detects walls earlier and starts turning sooner. (2) For main drain covers: if the drain cover protrudes more than 1 inch above the pool floor, the S1 may beach on it. Mark the drain area as an exclusion zone. (3) For irregular corners (e.g. Grecian or L-shaped pools): switch to Auto mode rather than Floor mode — Auto mode adapts the cleaning path to non-rectangular shapes.
