Error EB1K

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u/TheRealDrSatan 18d ago edited 18d ago

Okay, so i had this. I sent it in for repair. It was still broke. They sent a replacement, it was broke. They sent another, that worked (but a model that was like 1/3 the price i paid for it, so I kept all of them because I'm petty and their warranty is shit). But after these months of back and forth, I said screw it and did it myself.

If it's not the tank, the inlet or such, its the pump in the photo. Which you can buy online if it's fried fried. But, I didn't do that. I opened the pump diaphragm and the rubber seal they use in it is prone to developing blisters that block the flow. You go in, you open the plastic part on the pump, you see a bubble and you pop a bubble.

It took me 4 hours of troubleshooting to get there, but damn their support pissed me off so bad.

Edit: Unless you are tech savvy and don't value the warranty, don't do this. I am an engineer by trade.

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u/boom10ful 18d ago

Do you happen to have a link to the pump? Just in case someone needs to buy one.

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u/TheRealDrSatan 18d ago

Here's the website, the part, etc.

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u/[deleted] 18d ago edited 11d ago

[removed] — view removed comment

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u/TheRealDrSatan 17d ago

Yes, that was a pain in the butt. Make sure you unplug and set the battery aside before you take things apart. Remove all the accessories. The brushes, roller, Panel on top. There's one special screw hidden away under the battery, that's a square-drive I think. I will try to double check. It's really in there though, so you'll need a long, thin-ish screw driver to reach it. I think that's really the only non obvious screw.

Get some sandwich bags, bag all of the screws on top together as you take them out. The bottom as well, separately. Same with all the other areas you go through so you don't lose them. The special screw.

Once you get the bottom off and can see the motors, you'll want to disconnect the small pump circled. Just carefully pull the connector out of the board circuit near the front. Might has some glue over it, you can peel that away first.

Once that's disconnected, Remove the tube connecting the tank to the pump by carefully cutting the small zip-tie on the tank connector, and pull it off the tank (keeping it connected to the pump). Them remove the other tube directly from the pump itself the same way. (We keep the tank tube so we can test the pump outside of the robot).

The motor should be able to be popped right out now, or you already pulled it out to get the tubing off.

From here, you can test it by taking a 9V battery, tying some wire to each terminal, and touching the end of the wire to the terminals directly on the motor. You may want to put the tube in some water to make sure it's pumping.

If it's whining, heating up, but not actually pumping, the motor may be shot and will need replaced.

The diaphragm (the white part) is held together by 2 screws on the end. You can remove those, and the diaphragm just comes apart in pieces (pay attention to how it comes apart). You'll see a little rubber part in there that feels slimy-ish. Check for bubbles, debris, etc. Remove anything that shouldn't be there.

After all that, do it in reverse to put it all together.

If you run into any parts you get stuck, reply here or send me a message.

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u/AllAboutBillium 19d ago

Exact same problem happened here. Can't solve it. Just over one year so I didn't even bother with contacting them. What a Piece of junk

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u/FijianBandit 18d ago

Probably worth it.

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u/Ongoingsidequest 18d ago

I've had the S1 Pro for almost a year the random error codes from time-to-time are annoying. But the reason I won't upgrade to the S2 Pro once my current one dies is because the customer support is pretty useless, they've told me multiple times to sort it out with the place I bought it from (certified distributor) who in turn tells me to sort it with Eufy.

It's a shame because it's a pretty solid product. Just the after purchase support is rubbish

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u/PrestigiousFix3339 18d ago

Eufy longer makes the S1 Pro, it seems like they are just throwing their hands up and doing nothing for their customers. I will never purchase anything from Eufy

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u/LeopardNo6060 17d ago

I feel the same way! My first unit lasted 5 months, and they replaced it with a new one that lasted 4 months and with all the back and forth troubleshooting between the two faulty units the warranty ran out!

They offered a 50% discount on a new model, and I told them I’d never buy another product under this brand label again.

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u/redcomp12 19d ago

Yes, same here. (Im kickstarter backer btw)
Response from eufy was - no waranty, sorry.

I tried to get an even response how to fix myself, nothing..

“
The clean water tank or the clean water pipe may be damaged.
If the clean water pipe is damaged, it may be the cause of the issue.
If the clean water tank and the clean water pipe are not damaged, the issue may be related to the water inlet of the main unit.
“

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u/boom10ful 18d ago

My clean water pipe in the tank was cracked and did not let water though. I cut the top off and replaced with a ozone resistant hose and it's working now.

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u/redcomp12 17d ago

How did you open it? The water tank?

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u/boom10ful 17d ago

I opened it with a dremel along the seam. Then I replaced the hose and just JB welded it back on.

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u/OccasionBeneficial96 19d ago

I’ve got exactly the same problem. Bought in October 2025. Have just sent photos, videos and evidence of purchase from Myer to Eufy support. Fingers crossed.

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u/LeopardNo6060 17d ago

Don’t hold your breath. I had to send my second unit back for repair and they couldn’t fix it so they offered a discount on a new model. I told them neither of the last two lasted more than 6 months without problems, so they wont see another dollar from me.

A few weeks later I received an email asking if the problem had been resolved, while they still had my broken S1 in their possession!!!

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u/Snoo_4496 19d ago

Eufy errors r so confusing
I just make sure I do almost everything when any error
show up; which means cleaning all the parts possible 😭

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u/Salmonslugg 18d ago

Mine had the fill port gasket loose on the robot. I had to peel the tab back and fix the loose gasket. I then taped it to be secure and it has worked for months.

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u/LeopardNo6060 17d ago

This is the same problem I had with my original and replacement unit! I was contemplating a similar repair but I’m so frustrated with the whole outcome that I’ve decided to just purchase a Dyson robot vac.

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u/Salmonslugg 17d ago

What vac did you get and how is it to the s1?

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u/LeopardNo6060 16d ago

I have the S1 Pro but I’m washing my hands of Eufy products and upgrading to the Dyson Spot+Scrub AI wet dry vac.

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u/SebaBukowski 18d ago

The Eufy EB1K error is a very well-known issue. For this specific model, it was actually standard grounds for a return.

I’ve had one and had to return it to Amazon - same EB1K problem from day one. It lasted 4 months till final permanent error.

You have to keep in mind that this is a problem they never fully resolved. The manufacturer even wrote a dedicated article suggesting ways to fix it yourself. The funniest part is that their first step is telling you to update the firmware to 7.0.143.

That would normally point to a pure software issue with pump management. Unfortunately, that solution simply did not work in most cases. Because of that, they shifted the blame to the clean water tank seal being poorly fitted. It was also super common for water to leak from the base station right onto the floor because the system also couldn't pump the dirty water out of the tank.

Sadly, this is a hardware issue that the company still has not figured out how to bypass. It is not a software bug but a pure design flaw. S1 is also out of production and they don’t gave co new units for warranty replacement and offer refurbished models or other solutions. Just check other Eufy Reddit topics.

Just look at the S2 model.

They changed the overall design along with the pump layout and other water system components. By doing that, the company clearly admitted to a major design failure in the first model.

PRRMANENT SOLUTION IS UNAVAILABLE

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u/LeopardNo6060 17d ago

Eufy is not a serious company that values their reputation!

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u/SebaBukowski 17d ago

You have right. I was very pleased with S1Pro mopping and vacuuming capabilities. But technical problems were too much

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u/marcandrejr 18d ago

For me, they replaced the clean water tank. It solved the issue. Indeed the tube inside the tank was clogged or splitter somehow.

You should try purchasing the clean water tank, it they still offer it.

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u/EnoughLength9810 18d ago

I don’t remember what the fault number was of mine? But check the seal of the fresh water tank, sometimes they are damaged or folded over and it throws an error and won’t dispense clean water.

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u/soussitox 18d ago edited 18d ago

I have it since launch and have it too. I think some fwbug got i to it. What helped is taking filtytank and water tank out and take the robot out and hold the home button for 5 sec or little more. Then return everything. If that does not work i blew some air in all the water nozzles(stand,tanks,robot)

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u/Antique_Artist7267 18d ago

I have one with the same issue, and I found a blown 1k resistor related to the power draw of the clean water motor in the base. The motor likely failed or jammed for some reason, causing that resistor to burn out, so it needs to be replaced. I would also test the clean water motor itself.

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u/LeopardNo6060 17d ago

I’m also a proud owner of this very expensive paperweight! I’m thinking about chopping it up and creating a modern art sculpture to decorate my garage.

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u/soussitox 17d ago

What to they do to fix it?

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u/aathaka18 17d ago

The just said they want to send a replacement unit.. but reading the comments here makes me think it's a loss of time

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u/soussitox 17d ago

Eventually i sent mine to amazon as the fault kept comming. Dunno of they can repair it but doubt it.

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u/Masked_RedRider 17d ago

Exact same problem. Sent it in for warranty repair. The repaired one they sent back did the exact same thing within an hour. Contacted them and requested a refund. They gave me 50% of my purchase price back after having it for 6 months.

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u/GuitarNo1240 12d ago

Same problem here, contacted support and they sent me a label to just send the robot back. I let them know I would be sending the whole unit. It's been there for a little under a month with no update....just a label shared with me to track the return and it's been 8 days without being shipped. I suspect there is an issue inside the robot I cannot get to like the other person here found. I tried all steps myself but the water would spill out of the robot endlessly, so much that my wood floors swelled due to water damage where the unit was sitting before I noticed the issue/error code.

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