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Continuous tracks climb walls and scrub floors in pools up to 33 feet.
Weekly Smart Timer
3-mode automatic scheduling runs daily, every 2nd, or every 3rd day.
Combine + Ultra-Fine Kit
Top-load basket handles both everyday leaves and fine dust.
2×-Speed Active Brush
Loosens algae and stuck-on dirt across all pool finishes.
14.8-Lb Rapid Water Drain
Sheds water immediately when lifted onto the pool deck.
2-Year Maytronics Warranty
Factory coverage for two full pool seasons.
The Bottom Line
Where the Dolphin S100 Fits
Best For
Pools up to 33 ft wanting lightweight top-load floor and wall scrubbing with a Weekly Timer.
What We’d Buy
A compact 33-ft floor-and-wall cleaner with a Weekly Timer and two filter sets. Compare Advantage or Proteus DX3 online.
Choose by Pool Length and Waterline Needs
The 33-ft Dolphin S100 handles floors and walls with a Weekly Timer. The Dolphin Advantage is a close match for smaller pools, while the 50-ft Dolphin S200 adds a second brush and dedicated PowerStream™ waterline scrubbing.
The Dolphin S100 is a corded robotic pool cleaner from Maytronics, rated for in-ground and above-ground pools up to 33 ft long. It cleans the floor & walls on a 2-hour default cycle, using one active brush, with a rated suction of 4,000 GPH.
Filtration is a combine filter kit with top access, and an ultra-fine filter kit is included in the box. It has a weekly timer, and there is no app control. The robot weighs 14.8 lb and carries a 2-year Maytronics warranty.
Exclusively built to scrub and filter, the S100 gets your pool clean and ready for splashing in no time.
Maytronics, on the Dolphin S100
Specifications
Dolphin S100 Specs
Product Attributes
Maximum Pool Length
33 ft
Cleaning Coverage
Floor and Walls
Default Cycle Time
2 hours
Warranty
2 years
Delay Feature
No
Weekly Timer
Yes
Mobile Application
No
Anti Tangling Swivel
No
Additional Filter in the Box
Ultra-Fine Filter Kit
Filter Type
Combine Filter Kit
Cleaning
Filter Access
Top Access
Full Filter Indicator
No
Waterline Scrubbing
No
Enhanced Cleaning Cycles
No
Active Brush
Yes
Number of Brushes
1
Brush Type
Standard Brush
Suction Rate
4,000 GPH
Connectivity & Automation
Automation Mode
No
Pool Attributes
Pool Shape
Rectangular, Round, Free Shape, Kidney
Pool Classification
In ground and Above Ground
Size & Dimension
Package Dimensions
22.2x17.6x12.8 in
Robot Weight
14.8 lb
Net Height
10.6 in
Net Length
17.2 in
Net Width
15.8 in
Other
Remote Control
No
Specifications as published by Maytronics for product no. 99996121-USF.
FAQ, Manuals & Parts
Dolphin S100 FAQ & Owner Support
Frequently asked questions
Straight answers on parts, ownership, and the closest models you can order today.
Dolphin S100 vs. Dolphin S200—is the S200 worth $100 more?
Choose the Dolphin S200 if you need 50-ft reach, a second active brush, and dedicated PowerStream™ waterline scrubbing. For smaller pools without a waterline requirement, the S100 platform is sufficient.
Which replacement power supply fits the Dolphin S100?
Maytronics' own fixes for the problems owners report most, followed by the symptom table from the user manual.
My Dolphin does not complete a cycle / Red light on the Power Supply
Click here to use our easy-to-use self-service tool to troubleshoot your robot and complete a warranty claim for repair or power supply replacement.
If the robot was purchased through a local dealer, please verify if they provide repair services.
If your Dolphin robotic pool cleaner starts the cycle but does not complete or stops shortly after, or the Power Supply shows a red light (this means there is an error with the robot), follow these troubleshooting steps to try and resolve the issue:
Note: Before turning the robot on, it must be submerged in at least three feet of water.
4. Check the PowerStream (Selected Models only) (click here for steps)
If your robot model has a Power Stream mobility system (located on top of the Impeller), please check the plastic cover around the motor unit and the grilles on the sides of your model for visible debris and remove the debris.
Want to talk to a real person? Our Customer Care Team is here for you—just give us a call at 1-888-365-7446 / 1-855-634-8572! The Customer Care hours are Monday-Friday 8:00 am-5:00 pm EST
My Dolphin doesn't climb the walls or move sideways on walls
Click here to watch our Dolphin Tips video for step-by-step troubleshooting!
The robot should be used in water temperatures of 6°C - 35°C for optimal results. A low pool temperature can significantly hinder the robot's ability to climb. The water temperature should be maintained at a level higher than 15°C.
Checking Chemical Levels
Next, verify that the pool chemicals are within the recommended range. If the pH levels are too high or too low, this can affect the robot's climbing ability.
Additionally, if your robot has a fast mode or "Floor Only" mode, (only for models compatible with the MyDolphin/MyDolphin™ Plus app or with the power supply unit) verify that these modes have not been set.
Inspecting the Filters
It is imperative to check the filters. If you are using the Ultra-Fine (paper) filter, it should appear white. If the filter is brown or green, clean it with a garden hose set to the highest pressure. If the filter does not return to a white state– it is likely due to be replaced.
If you are using the Ultra-Fine filters, operate the robot with the Net Filters instead. If the robot is able to climb, this serves as an indication that the Ultra-Fine filters require replacement.
Debris in the Impeller
Make sure there is no debris obstructing the impeller. For instructions on how to clean your impeller, click here.
First, unplug the power supply from the outlet. Use a Phillips screwdriver, not a power drill.
If you notice debris trapped in the impeller, open it, remove the debris, and reassemble the impeller.
Does your robot have an adjustable handle? (Click Here)
Make sure the handle is aligned diagonally to help the robot climb.
For slow waterline cleaning (covers less surface area, but cleans more intensively): Put one end of the handle in the second/third slot, and the other end of the handle in the second/third slot (pictured above on the left side)
For fast waterline cleaning (covers more surface area, but cleans less intensively): Put one end of the handle in the first slot, and the other end of the handle in the fourth slot (pictured above on the right side)
Sufficient Cable Length
Ensure the robot has sufficient cable to allow it to climb the wall – the cable can pull the robot back if there is not enough of it.
To determine if you have the appropriate amount of cable in the pool, measure the cable length that matches your pool's longest dimension.
It is important to remember not to use an excessive length of cable to avoid tangling issues.
Brush Type
It’s important to use the correct brush based on your Dolphin model, the surface type and slopes of your pool.
PVC brushes are standard and work well for most pool floors.
Combined brushes (PVC with foam climbing rings) help the robot climb and grip better—if your robot has climbing rings, don’t remove them! They’re essential for performance and should be replaced when worn.
Wonder Brush is the ideal choice for ultra-smooth or slippery surfaces like stainless steel or polished mosaic tile.
If your robot struggles to climb walls or stay attached to the pool surface, switching to a combined brush might help.
If the robot is not cleaning the pool as it used to or is missing spots, we recommend verifying the following parameters.
Check that the chemical levels meet the following parameters:
Alkalinity: 80-120 ppm
pH: 7.2-7.6
Calcium Hardness: 150-250 ppm
Chlorine: 1.0-3.0 ppm
Cyanuric Acid: 30-50 ppm
Algaecide: 30-50 ppm
It is essential to maintain these levels for the best cleaning results and to preserve the robot's longevity.
The weather, our body chemistry, and additional factors can affect the chemical levels in the pool, therefore we recommend checking the chemical levels regularly. Click here to shop our pool chemicals
Check that the water temperature is between 43° - 95° Fahrenheit.
If your robot struggles to climb, ensure the pool temperature is higher than 59°F, as low temperatures can make it difficult for the robot to climb.
If there is a specific area in your pool that the robot is missing, we recommend putting the robot in that area from the start of the cycle.
If the robot is getting stuck in the deep end of the pool, it may be possible to upgrade the back brush on your robot to a Combined Brush or Wonder Brush. Please contact us here to verify if this solution will be suitable for your robot model.
What kind of debris is in the pool?
Depending on the type of debris there is in the pool, will help determine which filter type is most suitable for use.
If the debris is large debris such as tree foliage, we recommend using our fine (net) filters.
If the debris is sticky, algae-like debris, we recommend inquiring with your pool technician for further analysis and action.
If you complete a chemical shock, wait at least 24 hours after the treatment, before placing the robot back in the pool and verify that the chemical levels have returned to normal.
If there is a large amount of debris in the pool, we recommend running multiple cycles in a row and cleaning the filter after each cycle.
How does the robot filter look? Is it quite full? Could it be clogged?
We recommend using fine filter panels for large debris such as leaves and bugs, and ultra-fine filter panels for tiny debris such as dust, dirt, and sand.
Verify that the filters are not clogged and that the robot is free from debris, as clogged filters can interfere with the suction process and prevent the robot from picking up debris effectively.
First, unplug the power supply from the outlet. Use a Phillips screwdriver, not a power drill.
If you notice debris trapped in the impeller, open it, remove the debris, and reassemble the impeller.
Check your filter's non-return valve–the opening at the bottom of the filter–or the little black pouch attached to it and make sure it is free of debris.
Rapid drain flap
If applicable to your robot, make sure that the rubber rapid drain flap on the back of the robot is securely installed.
Why isn't the robot cleaning the debris on the steps/ledge/tanning shelf?
It is important to note that our robots are not designed to clean steps, stairs, or ledges. We recommend brushing the debris from the steps onto to the floor of the pool so that the robot can clean the debris.
Our robots require submersion in at least 35” of water to function properly.
If there is debris in the seam of a steep slope, we recommend brushing the debris from the seam onto a flat surface so that the robot will be able to reach the debris.
Important tips!
Make sure to put enough blue cable in the water to allow the cleaner to reach all areas in the pool.
It is important to make sure that the robot has a cable long enough to allow full coverage of your pool. You can measure the distance between the two farthest corners of the pool to get an understanding of the amount of blue cable needed. If your pool's length is over 30', make sure to use a robot with a cable length of 60'.
It is important to make sure that your robot's brush type is compatible with your pool coating.
If your pool has a PVC, concrete tile, concrete, or gunite coating, it is most compatible with a robot that comes with a PVC brush.
If your pool has a PVC, rough ceramics, fiberglass, or mosaic coating, it is most compatible with a robot that comes with a Combined brush (nylon should be removed before use).
If your pool has a smooth ceramic, stainless steel, or glass coating, it is most compatible with a robot that comes with a Wonder brush.
Special Considerations for Ultra-Fine Filters
It is important to note that if you are using ultra-fine filters, even if they appear to be clean, they may still be obstructed by tiny particles such as sand and dust. A useful tip is to observe the color of the filter:
If the ultra-fine filters do not wash out white anymore, this is a clear sign that they are indeed clogged, and we recommend replacing them.
Once your filters are clean, your robot will be able to clean more effectively.
Washing Bag Filters and Cartridge Panels
For bag filters, they can be washed in a washing machine at a temperature of 30 degrees Celsius, and it is advisable to let them air dry.
As for the filter cartridge panels, these can be cleaned in a dishwasher set to 30 degrees Celsius.
Click here to read more about the differences in the filter types.
Still need assistance? Click the blue chat icon in the bottom-right corner of your screen to start a conversation with our AI agent — 'Phin'!
My Power Supply Unit does not work properly
Click here to use our easy-to-use self-service tool to troubleshoot your robot and issue a warranty claim for a repair or power supply!
If the robot was purchased through a local dealer, please verify if they provide repair services.
Want to talk to a real person? Our Customer Care Team is here for you—just give us a call at 1-888-365-7446 / 1-855-634-8572! Between Monday-Friday 8:00 am-5:00 pm EST
Click here to watch our Dolphin Tips video for step-by-step troubleshooting!
If your Power Supply stops working, trips the GFCI outlet, or does not turn on at all, follow these troubleshooting steps to help diagnose and resolve the issue:
Step 1: Check the Power Source
Let's ensure that the issue is not originating from your home outlet. Try plugging the power supply into a different verified, working outlet or by disconnecting any extension cord that may be in use.
If the power supply still does not turn on, we can move on to the next step.
Step 2: Inspect the Blue and Black Cables
Examine the blue cable and the black power supply cord for any visible signs of damage, such as cuts, kinks, or frays.
If you find any cable damage, the cable should be replaced. Submit a warranty claim or visit your nearest dealer if you purchased from a local dealer.
If both cables appear to be in satisfactory condition and free from any damage, proceed to the next step.
Step 3: Determine the Source of the Issue
Now let's identify whether the problem lies with the Dolphin's Motor, the Cable(s), or the Power Supply itself. To do this:
Disconnect the blue cable from the Power Supply Unit.
Plug the Power Supply Unit into a functioning electrical outlet.
Now, turn on the Power Supply Unit without reconnecting the blue cable.
Step 4: Does the Power Supply Unit turn on and stay on?
After following the previous steps, does the Power Supply Unit turn on and stay on?
Click here, if it does!
If the Power Supply turns and stays on, the issue is not with the Power Supply. There may be an issue with the Dolphin's cable or motor unit.
An authorized Dolphin technician should analyze and repair the robot. Click here to submit a repair request or contact your local dealer (if you purchased the robot from a local dealer).
Click here, if the power supply doesn't turn on, or turns off immediately, or has stopped working altogether
It seems there is an issue with the Power Supply. Click here to create a warranty claim for a replacement power supply with our easy-to-use self-service tool!
Contact your local dealer if you purchased the robot from a local dealer for a replacement Power Supply Unit.
Power supply not connecting to Wi-Fi? Click here to read more.
My Power Supply works, but the Robot does not start
Click here to use our easy-to-use self-service tool to troubleshoot your robot and issue a warranty claim for a repair or power supply!
If the robot was purchased through a local dealer, please verify if they provide repair services.
If your robot doesn't start cleaning after powering it on, or if the main LED of the IoT Power Supply shows a Red light, complete the following troubleshooting steps to try and resolve the issue:
Disconnect the blue cable from the power supply. Inspect the blue cable to check for any cuts or damage.
Plug the power supply into a different outlet to verify that the issue isn't with the electrical outlet.
Reattach the blue cable back to the power supply and attempt to turn the unit on.
Check the impeller:
If debris is trapped in the impeller, open it, remove the debris, and reassemble it. For safety, use a Phillips screwdriver. Do not use a power drill. Click here to see how to clean your impeller.
Check the tracks:
Turn the robot upside down and try rotating the brushes by hand. Does it make any strange noises? If it does, take a closer look. Check the tracks, brushes, and every nook and cranny for any obstructions or visible damage. Click here to see how to clean the tracks.
Click here to watch a video with the step-by-step troubleshooting
If your robot is out of warranty and you want to purchase replacement parts, click here to visit our Spare Parts page. Ensure that you have the correct part number.
Click here to check your robot’s user manual and learn more about its features and functions.
Want to talk to a real person? Our Customer Care Team is here for you! Give us a call at 1-888-365-7446 / 1-855-634-8572. The support hours are Monday-Friday 8:00 am-5:00 pm EST.
Symptom
Possible reason
What to do
The power-supply or its switch led are not working.
• No voltage in the power socket in the wall. • The power supply is not switched ON. • The power cable is not well connected into the power supply inlet.
• Check that there is voltage in the power socket in the wall. • Check that the power supply is plugged in and turned ON. • Check that the power cable is securely connected all the way into the power supply. • Turn the power supply off. Wait 30 seconds then turn it back on.
The Pool Cleaner does not move.
• The floating cable is not well connected into the power supply outlet. • An obstacle blocks the impeller, tracks or wheels.
• Check that the floating cable is securely connected all the way into the power supply. • Unplug the power supply. Open the impeller cover and check that nothing is trapped in the impeller. Verify that nothing blocks the tracks or wheels.
The Pool Cleaner is moving in circles.
• Clogged filter basket/canister. • Debris stuck in the impeller-house or impeller-cover. • Power supply incorrectly positioned. • Algae or pool water is out of Spec.
• Clean the filter basket/canister. • Remove debris stuck in the impeller-house or impeller-cover (according to the drawings). • Place power supply in a position so that the Pool Cleaner can freely reach all the pool area. • Correct pool and water conditions.
The Pool Cleaner does not turn or moves in one direction only.
• Debris stuck in the impeller-house or impeller-cover.
• Remove debris stuck in the impeller-house or impeller-cover (according to the drawings).
The Pool Cleaner moves but does not clean the pool.
• Clogged filter basket/canister. • Debris stuck in the impeller-house or impeller-cover.
• Clean the filter basket/canister. • Remove debris stuck in the impeller-house or impeller-cover (according to the drawings).
The Pool Cleaner cleans only part of the pool.
• Power supply incorrectly positioned. • Not enough floating is released for the correct operation of the Pool Cleaner.
• Place the power supply in a position so that the Pool Cleaner can freely reach all the pool area. • Check that there is enough slack in the floating cable for the Pool Cleaner to reach all of the pool. • Clean the filter basket/canister.
The floating cable has kinks.
• Clogged filter basket/canister. • Debris stuck in the impeller-house or impeller-cover.
• Clean the filter basket/canister. • Remove debris stuck in the impeller-house or impeller-cover (according to the drawings). • To remove the kinks, stretch the floating cable out completely and let it sit for at least a day in the sun.
The Pool Cleaner doesn’t climb the walls.
• Clogged filter basket/canister. • Algae on walls. • Unsuitable pH level. • Debris stuck in the impeller-house or impeller-cover.
• Clean the filter basket/canister. • Check the level of the chemicals of the water. Improper levels may allow the growth of algae making the walls slippery. If so, adjust the levels and scrub the walls. • Remove debris stuck in the impeller-house or impeller-cover (according to the drawings).
From the Dolphin S100 user manual's troubleshooting table.
This model next to the three ProLine™, Max-Series™ and Clear™ robots closest to its price. Use the dropdowns to put any robot in a column: every Dolphin line, the Clear™ Series, and the other brands we carry.
