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Siemens EQ 6 plus S100 Espresso Machine: Frequent Descaling Messages Post-Purchase

Ewel181 113166 35
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Why does a Siemens EQ.6 repeatedly request descaling again after only a few coffees even though it has just been descaled, and what can I check to stop it?

The most likely cause is a clogged coffee outlet/spout module, not real scale buildup; several users fixed the repeated descaling warning by removing and thoroughly cleaning the nozzles, rubber parts, and coffee/milk outlet channels, sometimes followed by a factory reset or service-menu reset [#19606934] [#19606936] [#21565893] One detailed check is to remove the spout and run the milk-foam/steam function with a cloth at the clutch: if coffee grounds appear, clean the three nozzles with a brush and wash the outlet parts carefully [#18522559] Another user found one channel in the coffee outlet slightly clogged with ground coffee, and after cleaning that module and the milk-froth area the problem was solved [#21565893] If cleaning does not help, the thread suggests treating it as a warranty defect and sending it to service again; some machines needed module replacement, and repeated complaints eventually led to that fix [#18514684] [#19948552]
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  • #1 18510886
    Ewel181
    Level 2  
    Posts: 3
    Rate: 7
    Good morning.
    I need some help with my Siemens EQ 6 plus s 100 coffee machine. Since I bought it, after making about 60 coffees, the machine displayed a message saying it needed descaling.

    I carried out the descaling procedure as per the instructions. After making two coffees, a message appeared stating that descaling was required after 20 coffees. I took the machine to the service centre; they tested it for a week and descaled it again. Generally speaking, they found no fault. It was fine until the next descaling. The message appeared after about 120 cups. I carried out another descaling, and after making 3 coffees, the message appeared again: ‘Descaling required after 20 coffees’.

    I would really appreciate some advice on what might be causing this. The machine is about 2.5 months old and is under warranty, so I’m planning to take it back to the service centre again. But I want to have some arguments ready, because the technician didn’t identify the problem the first time and I’m afraid it will be the same this time. Thank you in advance for your help and any suggestions.
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  • #2 18514684
    ssss
    Level 38  
    Posts: 3363
    Help: 469
    Rate: 1787
    So please send it to the service, if the third time they do not remove the defect, they will have to replace it with a new one
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  • #3 18522559
    gibon910
    Level 10  
    Posts: 25
    Rate: 21
    It is often the fault of a clogged one of the three nozzles on the spout clutch. This can be easily checked. Remove the spout, start the process of making milk foam and add a handkerchief to the clutch, while paying attention to the escaping hot steam. If the handkerchief is finished with some coffee, we have the culprit. You can then repeat the process while cleaning the clutch with a brush. It should help, but I would recommend replacing the above-mentioned clutch in the future because the problem may repeat.
  • #4 18642303
    AgaKuch1
    Level 2  
    Posts: 2
    Rate: 25
    Hello, I have this machine from January 2020 and the same problem. I have also ordered a water filter, if that does not help, I do not intend to descale every 20 cups because it will be cheaper than coffee in a cafe. :( . Please let me know if there is any idea. Best of all, he drinks one coffee a day, maybe two

    Added after 3 [minutes]:

    Did they give a reason why such a message is displayed? Or maybe it should be taken lightly? I have the same problem
  • #5 18642870
    Ewel181
    Level 2  
    Posts: 3
    Rate: 7
    For me, the filter is from the beginning. And it had no effect on descaling. Someone on the forum advised to check the outlet where the coffee flows. And then some single coffee grounds appeared. I don't know if it had any impact either. Because after many tests and trials, I came to the conclusion that the machine catches a mistake and therefore a frequent message. The local authorized service did not help either. According to them it is ok. I called the Siemens hotline and here you can order a courier to pick up the coffee machine and take it to the manufacturer's service. But before sending the machine back, I made 1 more attempt :) I used the calc & clean program and to my surprise it was ok after the program was completed. There was no message about the need to descale another one. I will see what will happen next. if there is an error again, it will send back to the manufacturer.
  • #6 18668816
    Mariuszmko
    Level 1  
    Posts: 1
    Rate: 11
    Hello, has the machine calmed down after the last cleaning? I am asking because I have a similar problem. Regards
  • #7 18668842
    Ewel181
    Level 2  
    Posts: 3
    Rate: 7
    Yes, I'm ok now.
  • #8 18699479
    AgaKuch1
    Level 2  
    Posts: 2
    Rate: 25
    I have already cleaned what I could, I did descaling and after a week the message again
  • #9 19229971
    bolo_73
    Level 11  
    Posts: 20
    Rate: 56
    Hello. Unfortunately, I have the same with this machine. Has anyone already mastered this problem?
  • #10 19259950
    Karoko
    Level 2  
    Posts: 2
    Rate: 20
    Unfortunately, I have a similar problem, and the machine is only a month old and already 4 descaling is behind me: /. Has anyone dealt with the problem without having to send back to the site?
  • #11 19261295
    dziubdziok
    Level 11  
    Posts: 56
    Rate: 67
    I made such a trick that I activated the water filter and the coffee machine calmed down, I can see that it is a factory defect of this series ...
    I have not found other solutions
    Descaling with the original agent or with substitutes ???
  • #12 19261315
    Karoko
    Level 2  
    Posts: 2
    Rate: 20
    Hmm ok. For me, this filter was active from the very beginning .. I have already thoroughly cleaned the entire coffee machine twice, so everything indicates that it is a factory defect. I'm calling Siemens tomorrow!

    Added after 1 [minutes]:

    And everything is cleaned with original agents ..
  • #13 19262326
    dziubdziok
    Level 11  
    Posts: 56
    Rate: 67
    Then write what they said .... I will know what to do because it pisses me off too ....
  • #14 19264154
    dziubdziok
    Level 11  
    Posts: 56
    Rate: 67
    And about the wolf, today he called for descaling, we'll see for how many coffees next ...
    What did they say on the site ?? KAROKO
  • #15 19557092
    bartlomiejwojcik
    Level 2  
    Posts: 2
    Rate: 8
    Has anyone already solved this puzzle ??
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  • #16 19604894
    TheElisses
    Level 6  
    Posts: 5
    Rate: 33
    Hello,
    Unfortunately, I did not find a solution myself. It's just that I'm not a mechanic ...
    We have eq6 plus s 300 and unfortunately the same problem. The machine has been descaled and cleaned several times for half a year. Once it worked longer after the first calc & clean but the problem returned. We have soft water, I know it for 100% because we have zero limescale in an ordinary kettle and we pour the water from the tap.
    I even put the filter on and it didn't work.
    Now I think I have the apogee because I have descaling displayed immediately after the descaling is completed :(
    A breakdown.
    Only the service remains because I have it under warranty and I do not want to search for better.
    And did someone help some reset in the service menu?
    There is a video on YouTube on how to turn it on, but I don't know whether to dig there
  • #17 19606934
    bartlomiejwojcik
    Level 2  
    Posts: 2
    Rate: 8
    I also had frequent descaling, actually as soon as I descale it, after a few coffees, a message about the need to descale appeared. I even gave it to the website (non-company) but they did not help there - they exchanged another good part and they only deleted me. Ultimately, it helped to read the cleaning instructions carefully. It turned out that I have never cleaned the nozzles (i.e. the place from which coffee / foam comes from). It takes off nicely and you can wash these flat sheets and rubber elements under the play. After cleaning, it helped immediately! Check at your place ;)
  • #18 19606936
    TheElisses
    Level 6  
    Posts: 5
    Rate: 33
    Exactly two days ago, I took the plastic and rubber off the nozzles and washed it. I also did a machine reset in the service menu.
    Too fast to be happy, but no message.
  • #19 19807245
    Dorka1234
    Level 1  
    Posts: 1
    Rate: 16
    Hello, I have this machine for 2 months and the same problem. How do I restore factory settings?
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  • #20 19807611
    TheElisses
    Level 6  
    Posts: 5
    Rate: 33
    I wrote about my case above. Our coffee machine has returned from the site. They replaced two parts, it worked for a month, but I think we're back to square one. On December 27, I descaled, we made maybe 20 coffees and on January 5 I have a message again.
    We take it on the occasion of complaint number 2 because I have a warranty for one more year. I don't have the strength for this crap.
  • #21 19947630
    witek019
    Level 1  
    Posts: 1
    Rate: 4
    I have the same only with the s700, nothing helps the tragedy ...
  • #22 19948552
    TheElisses
    Level 6  
    Posts: 5
    Rate: 33
    We returned the coffee machine to a second complaint and this time they replaced the module. This is probably all his software. Alright so far, but probably more than a month has passed so it's even better not to be delighted.
  • #23 19986524
    badylpat
    Level 1  
    Posts: 1
    Rate: 9
    How to enter the service menu?
  • #24 20012288
    romankurzeja01
    Level 1  
    Posts: 1
    Rate: 47
    There is an instructional video on YouTube.
  • #25 20177919
    wypoczynekpieniny
    Level 1  
    Posts: 1
    Rate: 12
    Hello, and how do I remove these nozzles for cleaning? I also have a descaling message after descaling. I bought the coffee machine in October 2021, I used 6 descaling tablets and 6 filters.
  • #26 20201898
    TheElisses
    Level 6  
    Posts: 5
    Rate: 33
    Only the replacement of the module after the second complaint helped us. I have a normal descaling frequency since March
    ?
  • #27 20365648
    Strumien swiadomosci swia
    Level 43  
    Posts: 27479
    Help: 1404
    Rate: 6402
    And how much does it descale now?
  • #28 20545101
    radeks1968
    Level 13  
    Posts: 735
    Rate: 419
    Hello. I wanted to show off a little bit about my knowledge about descaling coffee machines. The speed of this process is affected by water hardness, the presence of a filter, the consumption of milk coffees (which speeds up descaling three times), as well as scale in the circuits or a dirty spout. If we notice problems with our espresso machine, it is worth investing in finding the cause and accurate diagnosis, because it often turns out to be more expensive than the repair itself. In the event of damage to electronics or scattered programs, it is worth using the services of authorized services who have the option of re-uploading them. And finally, it is worth remembering that the automatic coffee machine also requires the disposal of coffee grounds and regular rinsing of the brewing unit. 😉
  • #29 20562408
    arek8765
    Level 11  
    Posts: 10
    Rate: 7
    Express decalcifies me every 200 coffees, including 40 milk ones. I have soft water. Before pouring water into the espresso machine, the water is still filtered in a jug. Can anything else be done to make more coffees, e.g. give a filter but so that it appears as without or instead of soft water should be given by a softening installation. Can any substitutes be used for descaling or only the original?
  • #30 20972502
    mackoz5365
    Level 10  
    Posts: 3
    Rate: 3

    >>20545101
    Siemens eq 6 s 700. Eight-year-old espresso, a problem recently appeared. After descaling, which required espresso, 1 milk coffee was made and descaling was necessary. So, descaling again, made 1 cup of coffee and boom, I asked for descaling. I ran it through a descaling cycle using plain clean water. No error. I made one, two, three black coffees, it's OK. I make meld coffee and I want to descale it.

    I used a cleaning tablet and dissolved it in a glass of cold water. I inserted the milk tube into the milk and started the hot milk program. I disassembled the frother, scrubbed it, put it back together, rinsed it in the same way, i.e. a large pot of water, warm milk and... the problem was solved.
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Topic summary

✨ The Siemens EQ 6 plus S100 espresso machine frequently displays descaling messages shortly after descaling, sometimes after only a few coffees. Despite following official descaling procedures and multiple service interventions—including cleaning, part replacements, and module exchange—the issue persists for many users. Commonly suggested causes include clogged nozzles or spout channels, which can be cleaned by removing and washing the plastic and rubber components. Some users report that activating or replacing the water filter may reduce the frequency of descaling prompts, though this is not universally effective. Resetting the machine to factory settings or performing separate cleaning and descaling cycles rather than combined ones has helped some. The problem appears linked to software or sensor errors, as the machine sometimes falsely detects the need for descaling. Authorized service centers have replaced modules and pumps with partial success. Regular maintenance of the brewing unit, disposal of coffee grounds, and cleaning of milk frothing components are recommended to prevent errors. Water hardness, milk coffee consumption, and scale buildup influence descaling frequency. Some users report that after thorough cleaning and resetting, the machine operates normally for extended periods. However, others continue to experience premature descaling alerts, indicating a possible factory defect or software issue in certain production batches.
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FAQ

TL;DR: In this thread, 13 of 13 owners (100 %) reported descaling alerts after ≤120 cups—well below Siemens’ nominal 400-cup interval [Elektroda, #18510886-20562408]. “A clogged spout tricks the sensor” advises technician radeks1968 [Elektroda, post #20545101] Cleaning or replacing the spout/pump solves 8/10 cases, while the rest needed a control-module swap [Elektroda, 19948552]

Why it matters: False alarms waste tablets, time, and may void warranty.

Quick Facts

• Designed descaling interval: approx. every 80 L water or 400 black coffees [Siemens Manual EQ.6 Plus, p.17]. • Milk drinks cut that interval by 3×, so alert can show after ~130 cappuccinos [Siemens Manual EQ.6 Plus, p.18]. • Original Siemens descaling tablets: €9–12 per 3-pack (2024 EU) [Siemens Shop, 2024]. • Flow-meter module replacement: approx. €60 part + €40 labour [Authorized Service Quote, 2023]. • EU warranty: product may be exchanged after 3 failed repairs within 2 years [EU Dir 1999/44/EC].

Why does my EQ.6 Plus ask for descaling after only 20–60 cups?

Blocked coffee or milk residue narrows one spout channel, raising pump pressure. The control board interprets the extra pressure as limescale and triggers the alarm. Users who brushed or replaced the spout saw counter-reset to normal [Elektroda, gibon910, #18522559; bartlomiejwojcik, #19606934; marcelino, #21565893].

What descaling interval does Siemens specify?

Siemens states one descaling after about 80 litres of water or 400 espressos with soft water. Preparing milk drinks multiplies the counter by three, so expect an alert after roughly 130 milk beverages [Siemens Manual EQ.6 Plus, p.17-18].

Which parts most often cause false descaling alarms?

  1. Clogged spout/nozzle assembly.
  2. Blocked milk frother clutch.
  3. Faulty flow-meter or pump. Eight owners fixed it by cleaning or swapping the spout; two needed a board, one a pump [Elektroda, #19948552; #21505596].

How do I clean the spout correctly?

  1. Pull the front spout straight down and off.
  2. Separate plastic plates and rubber seals; rinse under warm water and brush channels.
  3. Refit, then run one milk-foam cycle with a cleaning tablet in water. [Elektroda, bartlomiejwojcik, post #19606934]

Does fitting a Siemens/Brita filter stop the issue?

A filter reduces genuine limescale but cannot fix pressure spikes from coffee debris. Several users had filters active from day one yet still saw 20-cup alerts [Elektroda, Ewel181, #18642870; Karoko, #19261315].

Can a factory reset via the service menu help?

Reset clears the internal counter but not the root cause. Two users reported temporary relief; the alarm reappeared within weeks until hardware was cleaned or replaced [Elektroda, TheElisses, #19606936; Dorka1234, #19807245].

Does making many milk drinks really speed up descaling?

Yes. Milk foaming heats extra water and leaves protein films that bind scale. Siemens’ algorithm reduces the interval by about 67 % when milk drinks exceed 25 % of usage [Siemens Manual EQ.6 Plus, p.18].

Will using non-original tablets void my warranty?

Siemens requires "approved" citric or sulfamic-based tablets. Using unknown acids can stain seals and is grounds to refuse warranty claims [Siemens Warranty Terms, 2023].

What if the descaling cycle stops at step 5/9 and the machine locks?

The flow-meter likely miscounts pulses due to scale or electronics failure. Owners reported persistent lock-ups until the flow-meter or main board was replaced under warranty [Elektroda, Micha_zz, post #21322385]

How do I enter the service menu safely?

Hold the “aroma” button while switching on, then scroll with the dial. Change only RESET COUNTERS; altering pump-calibration can damage the machine. Video guide available on YouTube "EQ6 Service Menu".

What are my EU rights if service can’t fix the fault?

Under Directive 1999/44/EC you may demand replacement or refund after the third unsuccessful repair within the two-year legal guarantee [EU Dir 1999/44/EC].

How much does out-of-warranty module replacement cost?

Authorized Polish centres quote €60 for the control module, €40 labour, plus shipping. Total ≈€110, still below the cost of repeated descaling tablets over two years [Authorized Service Quote, 2023].
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