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The M400 provides highly efficient pool cleaning for pools up to 50ft in length. Advanced systems ensure accurate scanning for systematic coverage of floor, walls and water-line, leaving clean and hygienic water throughout.
The Dolphin is not designed to be used with an extension cord or surge protector.
Dolphin pool cleaners purchased in the United States must be operated in North America in order to retain the warranty rights. Using any Dolphin pool cleaner outside of North America (that is purchased in the US) voids the warranty service agreement.
1 out of 5 High Price Manual Cleaner with Marginal Results
Jim Reece –
I purchased the M-400 robotic cleaner about a month ago. So this review is after 1 month of use. I paid over $1,300 for this unit, and so I expected a lot more than I got. First, the good thing is that it cleans the floor of my pool well. I like the dual rotor action, the two different filter options (mesh and pleated) and I like the cart with rollers. However, it does a poor job cleaning the walls and steps of my pool. And I have never seen it try to clean the skum line. I also have a tanning ledge that is about 1′ deep and the M-400 won’t even attempt to go there. I assumed that a $1,300+ cleaner today would be wi-fi compatible and have scheduling features. This cleaner has neither. I even called Maytronics to verify I was not missing something. It does have blue tooth, but that’s dumb because you have to be within a few feet of the unit for your phone to connect. And since it’s a basic on/off unit, the only thing you can do is turn it on. And since you have to be within a few feet for blue tooth to work, it’s much simpler to just press the button on the power unit. Not having any schedule features is a huge negative too. So when I am on vacation, there is no way for the M-400 to clean my pool unless I have someone drop by and manually start it. My pool pumps, sheer descent, deck jets and even my irrigation system is wi-fi compatible with scheduling features, so I can automate their function and operate them from my phone or a web site from anywhere in the world. Had I known the M-400 would not clean my walls very well and that it was a basic on/off cleaner, I would have saved $1,000 and bought a much cheaper cleaner. The M-400 is a huge rip off.
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5 out of 5 M400 Review
Rick Wojan –
After researching all of the different pool cleaners I bought the M400 and couldn’t be happier – it does a great job of completely cleaning the pool – floor, walls and steps. It’s quite easy to operate and saves me hours of time during the week and on weekends. On top of this their Customer Service is phenomenal and a pleasure to work with – they take the time to call and email back promptly (thanks Mandy and Tamara) to answer a request. Purchase a Dolphin and save yourself time, money and researching other manufacturers as the M400 is top notch in every respect. Then get yourself a proper beverage and watch it work.
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5 out of 5 Drop it in and walk away
JMAN54 –
When our in-ground pool was installed, our pool guy included another brand of automatic pool cleaner. It ran one cycle perfectly. The second time I went to use it, it wouldn’t start. WHAT??? Our pool guy replaced it -no questions asked- with a Dolphin M400. Smooth sailing ever since; now in third season. Recommended product.
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3 out of 5 Could be better
Micah –
Unit consistently gets stuck trying to go up a corner stair and doesn’t do anything until I remove it. Not sure why but would be good if it actually tried to get itself off. Means I can’t just leave it for a few hours and then come back. Has happened every time I have used the machine (which is only twice, but still, 2 for 2).
M400 does not climb any of our stairs at all and does not get up to the fairly deep tanning ledge (which I sort of expected but still a bit disappointing because the steps are pretty wide and it doesn’t even try).
M400 does not climb over a small safety ledge around the pool so does not clean the waterline at all. Would have been pretty easy for it to just try to keep going but it doesn’t. Seems like it was not designed or programmed to try to climb over anything.
Finally, I just found out that Maytronics seems to sell a brush specifically designed for fiberglass pools, which would have been nice to know on the website (and should have been an option as part of the base set). No clue where to find it or how much it costs because there are no details on Maytronics’ website. Just going on scraps from various forums.
Will use it, but knowing what I know now I would have tried another product or brand. Some of these issues might not be any better, but there would at least be a chance.
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1 out of 5 m400 stopped working 20 days out of warranty
robert –
unit was working great for the first 3years. stopped clean the walls took it to pool company where i got it. they said to adjust the handle side ways . worked for a week and then stopped running . took it back they said motor shot. now waiting to see if any thing an be done .
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5 out of 5 The Best Robot
Doug Messina –
Did alot of research before purchasing the M400. I previously had an Aquabot T4 which I thought was good, that is until I started using the M400. The M400 performs circles around the Aquabot( which was the best rated and most expensive consumer robot at the time) and addresses the inefficiency of the T4. First, the power cord does not tangle. The interchangeable filtration cartridges collect more debris and are easier to clean. The M400 is much easier to operate and ca be set for up to 3-hours. Does a better job of cleaning walls, however it can’t negotiate steps very well. The only drawback is the weight. It is heavy, especially when removing from the water, however, considering the performance, it is completely acceptable. I am in my second year of operation and would recommend the M400 to everyone who wants the best consumer level robotic pool cleaner available.
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5 out of 5 Very Reliable
NIck Jacob –
We have had our unit for 4 years with no problems. My only complaint is that the set of fine filters we bought have come apart from the plastic frame at the bottom. A Friend with the same unit had this problem and she has glued hers together, we need to do the same.
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3 out of 5 Buyers beware!!!
John A. –
Buyers beware!!!! Three years ago doing a lot of research I bought a M400 Dolphin. It has been in the shop every year since. The first year the brush on the bottom were loosing its knobs and had to be replaced under warranty. The second year the cord from the cart to the unit in the pool kept tangling up and pulling the cart from the wall. The swivel was not letting the cord swivel also replaced under warranty. Now this year. Took the Dolphin out of the pool house plugged it in nothing. Circuit breaker to unit was checked OK. Got my multimeter out 119.9 volts at receptacle. Took cord to supply unit checked voltage 119.9. Took to pool place where I bought it they checked it out motherboard was fried. $484.00 not in warranty out of warranty by one month. Worked fine last year when I put it up. Was in pool house all winter. I take care of my stuff but am sure disappointed with this unit.
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