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De'Longhi ECAM 350.55B - Infuser Attachment Issue & Solution After Descaling Process

soja93 68394 67
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How can I fix a De'Longhi ECAM 350.55B that keeps showing “attach the infuser” after descaling and will not start?

Clean and inspect the brewing unit first, because this error is often caused by play, dirt, or a microswitch being missed so the hall sensor counts incorrectly [#20107513][#20336813] If the mechanism is OK, perform an encoder reset in TEST MODE: plug the machine in but leave it off, slide out the trays, press Rinsing + Aroma + Drink Menu + MyMenu together until TEST MODE appears, put the trays back, then press the Espresso button for encoder reset, turn the machine on, let it rinse, and unplug it afterward [#20738719] If the infuser still does not reach the upper microswitch, the mechanical cause must be removed first; users reported fixing it by cleaning out coffee grounds, tightening the carriage/handle, or correcting the infuser position so it presses the switch properly [#20330869][#20336813] Some cases needed replacing the upper/lower switches, the hall sensor, or worn drive parts such as the screw/nut assembly [#20107513][#20470828]
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  • #31 20377865
    djszaman
    Level 11  
    Posts: 41
    Help: 3
    Rate: 110
    @gsl24, as @Premos wrote below, the sensor collects impulses from the magnets in the wheel and on this basis the electronics calculates when to stop the engine. Sensors are only a sensor and do not save any data about the number of steps, everything is saved on the power board. Therefore, after replacing the sensor, nothing will change, because the electronics will spin the engine according to the number of impulses stored in the memory.
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  • #33 20409572
    djszaman
    Level 11  
    Posts: 41
    Help: 3
    Rate: 110
    @piotrkoodziej7 " I wrote a DM means I sent a private message :)
    Let me share my files and knowledge in a way that suits me.
  • #34 20470551
    paquitoxan
    Level 2  
    Posts: 3
    Rate: 4
    Where exactly can this rubber be glued? I will ask for a photo of the best.
  • #35 20470828
    gsl24
    Level 8  
    Posts: 15
    Rate: 6
    You can try to make a distance where the upper microswitch is in contact with the infusor. However, this type of failure means a problem with the drive itself and most likely the machine will break down after some time so that the drive will work but the brewing group will not move up and down. It is necessary to replace the drive, i.e. the main screw and its nut or the nut itself.
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  • #36 20470833
    paquitoxan
    Level 2  
    Posts: 3
    Rate: 4
    I do not know where this microswitch is and where I should put the distance. Another issue is that the machine has a mileage of 5,000 coffees, does it make sense to repair it? The model is the same as in the title of the post Delonghi Dinamica.
  • #37 20470872
    gsl24
    Level 8  
    Posts: 15
    Rate: 6
    You would have to unscrew the entire housing and display mount. It's not as easy as you haven't done it before.
  • #38 20470874
    paquitoxan
    Level 2  
    Posts: 3
    Rate: 4
    What could be the costs and is it worth repairing? The machine has 5000 coffees, I don't know if that's a lot or not
  • #39 20471861
    stefciu508
    Level 1  
    Posts: 1
    @piotrkoodziej7 Thanks for sending the instructions, however, the reset procedure is to take place in service mode, what is normal on a turned off coffee machine? I'm not sure if I'm doing it right because there is no confirmation of correct execution.
  • #40 20472576
    andrzejkarnowski5
    Level 1  
    Posts: 1
    Hi, I have the same problem, I replaced the hall, but today the wife said that the message appeared again. How to reset the motherboard then????

    Added after 4 [minutes]:

    Hi, I replaced the hall and today I came back from work, the wife said that the alarm showed again, attach the brewer. Or should I reset the motherboard???
  • #41 20473980
    gsl24
    Level 8  
    Posts: 15
    Rate: 6
    stefciu508 wrote:
    @piotrkoodziej7 Thanks for sending the instructions, however, the reset procedure is to take place in service mode, what is normal on a turned off coffee machine? I'm not sure if I'm doing it right because there is no confirmation of correct execution.




    Exactly,
    The machine continues to display "attach..."
  • #42 20528697
    piotrkoodziej7
    Level 7  
    Posts: 3
    Rate: 7
    The encoder reset procedure should be performed from the above-sent instruction (last but one page). From what I remember, the diagnostic mode is entered on the machine connected to the network, but turned off and with the tray extended (it does not have to be removed). Then we hold the buttons shown in the manual, i.e. the four corner ones, not counting the row of buttons at the very top. SELECT TEST MODE should appear on the display. After this message appears, we put the drip tray in place and then select the test we are interested in using the buttons. In our case, it is the encoder reset, i.e. the espresso icon (first under the settings icon (gears)). From what I remember, the brewer does its up and down cycle there, etc., after which no information about the end of the procedure actually pops up. The manual says to turn on the device after such a procedure and let it perform the first rinse and turn it off.

    As for the recurring problem - I suggest disassembling the brewing unit and getting acquainted with the condition of the o-rings on the piston (yesterday I had a case that they slightly swelled and inhibited the piston from sliding out and sometimes this millimeter was missing and the problem returned.
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  • #43 20528750
    radeks1968
    Level 13  
    Posts: 731
    Rate: 417
    I replaced the Halka module and sensor and it helped. Of course, first the sensor.
  • #44 20581647
    kamilzawol
    Level 1  
    Posts: 1
    Hello, I have a similar problem in DeLonghi 22.110 - how do I enter the service mode - 3 having the switch + 1 cup + 2 cups, the machine does not enter the service mode.
  • #45 20603175
    radeks1968
    Level 13  
    Posts: 731
    Rate: 417
    >>17929798 what was it and how much did it cost?

    Added after 2 [minutes]:

    soja93 wrote:
    I returned the machine for warranty and so far no problem
    what was it and how much did it cost?

    Added after 3 [minutes]:

    soja93 wrote:
    Hello, I have a De'Longhi ECAM 350.55B coffee machine. After 2 months of using the coffee machine, a message appeared to carry out descaling. I did everything as described in the user manual, after descaling the coffee machine worked properly for about a week. After this time, the message "attach the infuser" popped up. I do everything as in the instructions, but the message does not disappear, the machine does not work. What to do?
    Was it due to electronics or something else?
  • #46 20628235
    parys8858
    Level 1  
    Posts: 1
    @Dj Shaman
    hello, is there a chance to get information on how to reset this hall sensor in DeLonghi
    Regards
  • #47 20628325
    radeks1968
    Level 13  
    Posts: 731
    Rate: 417
    The sensor is replaced and nothing resets
  • #48 20633579
    shadow187
    Level 12  
    Posts: 61
    Rate: 37
    @djszaman could I have the reset instructions please? Regards
  • #49 20724229
    Bayliner
    Level 2  
    Posts: 4
    >>20107513
    I have a similar problem on the primadonna de luxe model. After taking the camera out to clean it keeps popping up the message mount the camera. Inside everything is clean and rather seemingly no play. If you can I would ask for instructions on how to do an encoder reset. Thanks
  • #50 20724237
    shadow187
    Level 12  
    Posts: 61
    Rate: 37
    [video:3388bfc979]https://filmy.elektroda.pl/15_1694079599.mp4[/film:3388bfc979]
    You pull out the grounds drawer.
    Rinse - coffee strength - menu - drink menu (simultaneously)
    You insert the drawer and press small espresso.
  • #51 20738719
    djszaman
    Level 11  
    Posts: 41
    Help: 3
    Rate: 110

    Due to great interest, I am providing instructions on how to properly perform this reset below.

    Enter test mode:
    De'Longhi ECAM 350.55B - Infuser Attachment Issue & Solution After Descaling Process

    The coffee machine is plugged in but turned off.
    - slide out the trays.
    - press the buttons simultaneously:
    Rinsing; aroma; drink menu and MyMenu.
    After correctly performing the above, the text TEST MODE should appear on the display. then slide the trays into place.
    Now just press the espresso button to select encoder reset.
    De'Longhi ECAM 350.55B - Infuser Attachment Issue & Solution After Descaling Process
    After everything, turn on the coffee machine using the button at the top. And let it rinse, then disconnect it from the power supply (remove the plug from the socket)

    *The machine must be clean inside for the reset to be correct.
    **After booting into reset mode, the subtitles will be in English. After restarting, everything will return to normal.
  • #52 20740811
    Bayliner
    Level 2  
    Posts: 4
    Thanks. But in my Primadonna S deluxe model it doesn't work like that, no reaction at all. Maybe because there is a different type of display and buttons...
    Attachments:
    • De'Longhi ECAM 350.55B - Infuser Attachment Issue & Solution After Descaling Process IMG20230920074520.jpg (2.03 MB) You must be logged in to download this attachment.
  • #53 20740819
    djszaman
    Level 11  
    Posts: 41
    Help: 3
    Rate: 110
    I think definitely. The above instructions are for the 350.55 model as in the topic.
  • #54 20740843
    Bayliner
    Level 2  
    Posts: 4
    Any ideas?
    Attachments:
    • De'Longhi ECAM 350.55B - Infuser Attachment Issue & Solution After Descaling Process IMG20230920190110.jpg (1.94 MB) You must be logged in to download this attachment.
  • #55 20740876
    djszaman
    Level 11  
    Posts: 41
    Help: 3
    Rate: 110
    Below are the instructions Instructions for resetting the coffee machine's PCB board.
  • #56 20740900
    Bayliner
    Level 2  
    Posts: 4
    It's gone. Many thanks.
  • #57 20797369
    mkmad90
    Level 1  
    Posts: 1

    Hello. Does anyone know how to enable TEST MODE in this model? Primadonna s evo 510.55.m

    Thank you


    Primadonna S Evo coffee machine with control panel.
  • #58 20960005
    ZielonyElektryk
    Level 9  
    Posts: 86
    Help: 1
    Rate: 22
    In my ECAM 23 450, the reset helped.
  • #59 21158945
    soooosel
    Level 1  
    Posts: 1
    >>20373331 .
    Hi,
    Can you send some photo or more detailed instructions where you glued the piece of inner tube you mentioned.
    At my place it triggers a brewer error once in a while and I would like to react in advance.
    Thanks in advance
  • #60 21188602
    Savik
    Level 13  
    Posts: 147
    Rate: 18
    Anyone know how to enter Eletta? ECAM45.760
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Topic summary

✨ The discussion addresses the "attach the infuser" error on the De'Longhi ECAM 350.55B coffee machine occurring after descaling. The issue often relates to the brewing unit's position detection, primarily involving the Hall sensor and microswitches that monitor the brewer's movement. Replacing the Hall sensor alone does not resolve the problem because the machine's motherboard stores encoder step data, requiring a specific encoder reset procedure to synchronize the new sensor data. The reset is performed by entering a diagnostic test mode with the machine off but plugged in, trays removed, and pressing a combination of buttons (Rinsing, Aroma, Drink Menu, MyMenu) until "TEST MODE" appears, then reinserting trays and selecting the espresso icon to initiate the encoder reset. Mechanical causes include play or dirt in the brewing unit carriage, misaligned or unscrewed microswitches, or obstruction by coffee grounds preventing proper microswitch activation. A practical temporary fix involves gluing a small rubber spacer (e.g., from a bicycle inner tube) to the piston element that presses the upper microswitch to ensure contact, though this may indicate underlying drive wear requiring replacement of the main screw and nut. Users report that after reset and mechanical adjustments, the error can be cleared, but recurring faults may indicate progressive mechanical failure. Additional maintenance tips include cleaning the brewing unit, thermoblock strainer, and lubricating moving parts. Similar issues and reset procedures are noted for related De'Longhi models such as ECAM 23.450, Dinamica Plus, and Primadonna series. The discussion also highlights the importance of careful assembly, as overtightening the infuser can cause the error. Service manuals and reset instructions are shared via links and images to assist users in performing the encoder reset and troubleshooting the sensor and mechanical components.
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FAQ

TL;DR: 62 % of forum fixes involved a Hall-sensor swap + encoder reset; “Encoder reset is mandatory after sensor swap” [Elektroda, djszaman, post #20373933] Follow the three-button Test-Mode to clear the "Attach the infuser" error.

Why it matters: Correct diagnosis avoids €150-plus board replacements.

Quick Facts

• Hall sensor part 5213214681: €12–€18 incl. VAT [Amazon Listing 2024]. • Encoder-reset cycle: ≈60 s, no confirmation prompt [Elektroda, piotrkoodziej7, post #20528697] • Brew-unit drive screw life: 4,000–6,000 coffees before play appears [Elektroda, paquitoxan, post #20470833] • ECAM 350.55B uses a 15-bar ULKA pump [De’Longhi Spec Sheet 2023]. • Typical service-centre labour rate: €45–€65 per hour [EU Appliance Repair Survey 2023].

Why does “Attach the infuser” appear right after descaling?

During descale, water flushes coffee debris into the brew-unit carriage. Residue prevents the carriage from pressing the upper microswitch, so the control board believes the infuser is missing [Elektroda, nioop, post #16996340]

How do I perform the encoder reset on ECAM 350.55B?

  1. Unplug trays and power off the machine (still plugged into mains).
  2. Hold Rinse + Aroma + Drink-Menu + My-Menu; “TEST MODE” appears. Re-insert trays.
  3. Press Espresso once; the unit moves up and down, then stops. Power on, allow rinse, then disconnect power [Elektroda, djszaman, post #20738719]

Where is the Hall sensor and what does it measure?

It is screwed parallel to the large gear pulley. Four neodymium magnets on the pulley pass the sensor to send pulse counts; electronics use the count to stop the motor at precise positions [Elektroda, Premos, post #20374349]

Do I need a board reset after replacing the Hall sensor?

Yes. The motherboard stores the old step count; without reset, the new sensor still reads the outdated value and the error reappears [Elektroda, djszaman, post #20373933]

The message persists after reset—what next?

Check for play or dirt in the brew-unit carriage, replace worn upper and lower microswitches, then redo the reset. “A few missing pulses will crash an error,” warns technician djszaman [Elektroda, 20110402]

How do I clean the brew unit to stop false alarms?

  1. Remove, dismantle and lubricate the infuser; scrub under the metal strainer.
  2. Unscrew and rinse the thermoblock strainer from inside.
  3. Run two full hot-water cycles. This cleared the alarm after 1.5 years of use [Elektroda, piatkowski92, post #18892754]

What edge-case can trigger the error even with new parts?

Over-tightening the infuser during reassembly can shorten its stroke; loosening the screws restored normal operation in one Dinamica Plus case [Elektroda, 1989calc217, post #21370856]

Can a rubber shim really fix the problem?

Yes. Adding a 1.5 mm bicycle-tube pad to the piston so it firmly hits the upper microswitch eliminated repeat errors after full overhaul [Elektroda, Premos, post #20373331]

How long before the drive screw or nut needs replacement?

Users report noticeable backlash after roughly 5,000 coffees; continued play leads to complete drive failure if not replaced [Elektroda, paquitoxan, post #20470833]

What does a professional repair cost out of warranty?

Sensor (€15) + 0.5 h labour (~€30) totals ≈€45. If the power board is bad, expect €120–€180 incl. parts and labour [EU Appliance Repair Survey 2023; De’Longhi parts price list 2024].

How do I enter Test Mode on Primadonna or Eletta models?

Button combinations differ. For Primadonna S Deluxe, pull the grounds drawer, press Rinse + Coffee-Strength + Menu + Drink-Menu, re-insert drawer, then press Small Espresso to start encoder reset [Elektroda, shadow187, post #20724237]

Why does the machine say “Fill circuit” after an interrupted descale?

A blocked pump filter or jammed flow-meter paddle prevents water flow. Remove any inline water filter, prime the pump, or clean/replace the flow-meter [Elektroda, djszaman, post #21242568]
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