Why won't my Dolphin climb walls or move sideways on walls?

Work through these checks in order. The Dolphin Tips video shows the troubleshooting process step by step.

Step 1Check the water temperature

The recommended operating range is 6°C to 35°C. Cold water can significantly reduce your Dolphin's ability to climb. For climbing performance, keep the water above 15°C while staying within that operating range.

Step 2Check pool chemistry

Make sure your pool chemicals are within their recommended ranges. A pH level that is too high or too low can affect wall climbing.

Step 3Check the cleaning mode

If your Dolphin offers fast mode or "Floor Only" mode, make sure neither is selected. This check applies only to models that support these settings through the MyDolphin/MyDolphin™ Plus app or the power supply unit.

Step 4Inspect and clean the filters

1. Check the filter's condition. An Ultra-Fine (paper) filter should be white.
2. If it looks brown or green, rinse it with a garden hose at its highest pressure setting.
3. If cleaning does not restore the white color, the filter likely needs replacement. Poolbots sells replacement parts, and Poolbots' pool experts can help you choose the right filters through live chat or phone.
4. If you are using Ultra-Fine filters, try running the robot with Net Filters instead. If it climbs with Net Filters, that indicates the Ultra-Fine filters need replacement.

Step 5Check the impeller for debris

Debris can obstruct the impeller. Refer to the impeller-cleaning instructions and follow these precautions:

1. Unplug the power supply from the electrical outlet before opening the impeller. Use a Phillips screwdriver, not a power drill.
2. If debris is trapped in the impeller, open it, remove the debris and reassemble it.

Step 6Adjust the handle, if equipped

If your Dolphin has an adjustable handle, position it diagonally to help the robot climb.

• Slow waterline cleaning: Place one handle end in the second/third slot and the other end in the second/third slot, as shown on the left. This setting covers less surface area but cleans more intensively.
• Fast waterline cleaning: Place one handle end in the first slot and the other in the fourth slot, as shown on the right. This setting covers more surface area but cleans less intensively.

Step 7Check the cable length

Make sure there is enough cable in the pool for the robot to climb the walls. Too little cable can pull it back.

To check the amount needed, measure a length of cable that matches your pool's longest dimension. Avoid putting excess cable in the water, since that can lead to tangles.

Step 8Check the brush type and condition

The right brush depends on your Dolphin model, pool surface and pool slopes.

• PVC brushes: These are standard brushes and work well on most pool floors.
• Combined brushes: These pair PVC with foam climbing rings to improve grip and climbing. Leave the climbing rings in place. They are essential to performance and should be replaced when worn.
• Wonder Brush: This is the best choice for very smooth or slippery surfaces, including stainless steel and polished mosaic tile.

A combined brush may help if your robot struggles to climb or stay against the pool surface. Before switching, chat with Poolbots' pool experts to confirm compatibility with your model.

Repair help

If these checks do not resolve the problem, contact Poolbots' pool experts through live chat or phone. For warranty repairs, Poolbots will point you to Maytronics' self-service repair process for sending the robot in for repair.

Original support references

These links are retained as source references. For help choosing parts or confirming compatibility, use Poolbots' live chat or phone support.

• Maytronics parts and accessories reference
• Maytronics dealer-directory reference
• Maytronics support reference