Dolphin robotic pool cleaners are some of the most popular in the industry—known for efficiency, automation, and deep cleaning. But like all machines, they’re not immune to issues. Whether your Dolphin won’t start, keeps stopping mid-cycle, or isn’t cleaning properly, this guide covers it all.
Below, you’ll find the most common Dolphin pool cleaner problems, why they happen, and how to fix them quickly so you can get back to enjoying a spotless pool.
1. Dolphin Pool Cleaner Not Turning On
Quick Answer: If your Dolphin pool cleaner won’t power on, the issue usually lies with the power supply, outlet, or internal wiring.
Troubleshooting Steps:
- Check the outlet: Ensure it’s supplying power. Test with another device to confirm.
- Inspect the power supply: Look for frayed cords, water damage, or a tripped internal fuse.
- Verify connections: Make sure the cleaner cable is fully plugged into the power unit with no visible damage.
Recommended Fix: If the power supply is dead or flickering, consider replacing it with a compatible Dolphin OEM Power Supply Unit for your specific model.
2. Dolphin Stops Mid-Cycle
Quick Answer: If your Dolphin stops partway through a cleaning cycle, it could be due to software errors, debris buildup, or overheating.
Possible Causes:
- Clogged filter or impeller: Debris may be blocking movement or motor rotation.
- Overheating motor: This usually causes the cleaner to shut down for safety.
- Software glitch: A power reset may solve intermittent issues.
Quick Fix: Turn off the cleaner, unplug it, and clean the filter basket and impeller. If it keeps happening, update the firmware if supported by your model, or perform a full system reset.
Pro Tip: Use a Dolphin Impeller Cleaning Tool to safely remove hair and gunk without damaging internal parts.
3. Dolphin Doesn’t Climb Walls
Quick Answer: If your Dolphin cleaner only cleans the floor but won’t climb walls, you might be dealing with worn tracks, buoyancy issues, or dirty sensors.
How to Fix It:
- Check the climbing tracks: Worn or stretched rubber tracks reduce wall traction—replace them if they’re smooth or cracked.
- Clean the sensors: Optical or gyroscopic sensors may misread the pool angle if they’re dirty or fogged up.
- Test buoyancy: The cleaner should be slightly positively buoyant to climb walls. Check for trapped air or water inside the cleaner housing.
Replacement Option: Install Dolphin Climbing Track Kits for enhanced vertical performance, especially on plaster or vinyl surfaces.
4. Dolphin Cleaner Not Moving or Getting Stuck
Quick Answer: A stuck or unmoving Dolphin is typically due to cable tangling, blocked tracks, or software confusion.
Steps to Troubleshoot:
- Inspect the tracks: Clear any debris, hair, or pebbles stuck in the drive system.
- Untangle the cable: Lay the cable flat and straighten it out. Let the cleaner run freely during its next cycle.
- Check software patterns: Some models use smart navigation. If stuck in a loop, reboot the system.
Upgrade Option: Use the Dolphin Anti-Tangle Swivel Cable if your model supports it—it prevents coiling and enhances mobility.
5. Dolphin Doesn’t Clean the Whole Pool
Quick Answer: If large areas of the pool are missed, it may be due to an incorrect cleaning mode, sensor problems, or a dirty filter basket.
Key Fixes:
- Choose the correct cleaning cycle: Some models offer “floor only” or “floor and walls” modes. Use the full cycle for comprehensive coverage.
- Clean the filter basket: A full filter reduces suction and movement.
- Update or calibrate smart navigation (if available): Refer to your model’s app or settings.
Helpful Accessory: Upgrade to a Dolphin Ultra-Fine Filter Basket to improve suction and cleaning accuracy for fine particles and sand.
6. Dolphin Cleaner Floating or Not Sinking
Quick Answer: If your Dolphin floats or refuses to stay down, trapped air or buoyancy imbalance is the issue.
Here’s What to Do:
- Burp the unit: Submerge it and gently rock it back and forth until all air bubbles escape.
- Check for water inside the shell: If present, seals may be leaking—stop using and contact support immediately.
- Ensure nothing is stuck in the impeller: A jammed impeller can stop water from moving through the cleaner properly.
Important: Never run a floating cleaner—it can cause overheating or electrical damage.
7. Power Supply Unit Blinking or Not Responding
Quick Answer: Flashing lights usually indicate error codes. Each model may differ, but common meanings include blocked motor, communication error, or power surge.
How to Troubleshoot:
- Unplug and wait: Disconnect for 30 seconds, then restart.
- Check the cable connection: Make sure the cable is dry and firmly attached.
- Look for fault codes in your manual: Match blinking patterns with your user guide to determine the problem.
Replacement Tip: If the unit won’t reset or shows consistent faults, you may need a new Dolphin Power Supply Box—be sure to get one specific to your model series.
Maintenance Tips to Prevent Dolphin Cleaner Problems
Preventing issues is easier than repairing them. Here’s how to keep your Dolphin cleaner running like new.
Routine Maintenance Checklist:
- Empty and rinse the filter basket after each use
- Store out of direct sunlight when not in use
- Uncoil the power cable after every cleaning cycle
- Inspect climbing tracks and brush rollers monthly
Must-Have Accessory: The Dolphin Pool Cleaner Caddy protects the power supply and cable, extends the lifespan of the cleaner, and makes storage easy.
Dolphin Pool Cleaner Problem-Solution Table
| Problem | Likely Cause | Solution |
|---|---|---|
| Not turning on | Power supply issue | Check outlet, replace power box |
| Stops mid-cycle | Clogged filter or overheating | Clean filters, reset system |
| Won’t climb walls | Worn tracks or dirty sensors | Replace tracks, clean unit |
| Gets stuck | Cable tangling, software loop | Straighten cable, reboot system |
| Floating | Air trapped or water intrusion | Submerge slowly, check seals |
When to Replace Your Dolphin Pool Cleaner
If your Dolphin is beyond repair or performance continues to decline despite maintenance, it may be time to upgrade.
Signs You Need a New Unit:
- Repeated motor errors or circuit board failures
- Cracked housing or severe water leaks
- Over 5–7 years old and no longer under warranty
Recommended Upgrade: The Dolphin Nautilus CC Plus offers smart navigation, easy filter access, and full pool coverage—making it one of the top-rated replacements for aging cleaners.
Conclusion: Troubleshoot Smarter, Clean Better
Dolphin robotic pool cleaners are incredibly efficient—but only if they’re running properly. Whether your unit isn’t starting, cleaning, or staying submerged, most issues can be resolved with some basic maintenance or a quick part replacement.
Don’t let a minor glitch ruin your pool day. Use the tips and product recommendations above to fix your Dolphin pool cleaner today and keep your pool in top condition all season long.