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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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  • #1 16995034
    soja93
    Level 9  
    Posts: 5
    Rate: 4
    Hello, I have a De'Longhi ECAM 350.55B coffee machine. After 2 months of using the 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?
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  • #2 16995114
    pawlok7797
    Level 12  
    Posts: 115
    Help: 4
    Rate: 107
    And you hear that the brewer surprises in its place?
  • #4 16995214
    pawlok7797
    Level 12  
    Posts: 115
    Help: 4
    Rate: 107
    If there is a guarantee, I will send it to the service, from the top and bottom switches I would suggest to start checking.
  • #5 16996340
    nioop

    Home appliances specialist  
    Posts: 3359
    Help: 503
    Rate: 3319
    It looks more like a hall sensor to me.
    The brewer stops at the top and bottom, does not try to push it by force.
    However, the verification will not be easy .. I would suggest trying to replace the hall sensor. If this does not help, then the problem may be in the lift magnets.
    Company Account:
    Kawa i Naprawa - Serwis AGD
    Powstańców Śląskich 63, Warszawa, 01-355 | Company Website: https://www.kawainaprawa.eu
  • #6 17320830
    kesy1
    Level 10  
    Posts: 37
    Rate: 58
    Hello
    I have the same problem and I intend to order a hall sensor. After the exchange I will write if it helped
  • #7 17929798
    soja93
    Level 9  
    Posts: 5
    Rate: 4
    I gave the machine for guarantees and so far there is no problem
  • #8 18843488
    Demek1991
    Level 10  
    Posts: 32
    Rate: 22
    Does anyone have a specific solution to the problem? I replaced the ompkr at home and read that a reset is needed later, but I don't know how to do it. Someone help? I suspect that it could be similar for you
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  • #9 18892754
    piatkowski92
    Level 1  
    Posts: 1
    Rate: 4
    Perhaps someone will find it useful.
    I had a similar problem with the machine showing the general alarm message. The machine did not rinse, did not make coffee, did not turn off properly. The problem appeared right after making two coffees and turning off the machine.

    I have cleaned the entire brewing unit, including taking it apart and lubricating it. Most of the dirt was under the strainer.

    I unscrewed and cleaned the thermoblock strainer. This can be done from inside the machine. It was very dirty.

    The last step (crucial in my case) is running hot water twice as a whole process.

    If there is a problem with removing the brewing unit, you need to rotate the toothed wheel from the motor with your finger.

    The fault occurred after 1.5 years of use.
  • #10 20026880
    wojtastomasz85
    Level 8  
    Posts: 8
    Rate: 13
    Hello, has any of you found a solution to this fault "Install the infuser"? Replaced the hall sensor, unfortunately no improvement.
    Please help
  • #11 20090687
    radeks1968
    Level 13  
    Posts: 731
    Rate: 417
    wojtastomasz85 wrote:
    Hello, has any of you found a solution to this fault "Install the infuser"? Replaced the hall sensor, unfortunately no improvement.
    Please help
    is the problem solved?
  • #12 20090963
    wojtastomasz85
    Level 8  
    Posts: 8
    Rate: 13
    Unfortunately not. From what I was able to find out, after replacing the sensor, you should restart the board. There is no information anywhere on how to do this.
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  • #13 20094620
    radeks1968
    Level 13  
    Posts: 731
    Rate: 417
    Replacing the Hall sensor helped so much that the brewer stops as it should. Install the brewing unit is displayed. Probably electronics.
  • #14 20107513
    djszaman
    Level 11  
    Posts: 41
    Help: 3
    Rate: 110
    Most often, the problem occurs when there is play in the brewing unit's carriage or it is dirty, then it misreads impulses from the hall. It is best to replace the upper and lower switches and reset the encoder
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  • #15 20110278
    radeks1968
    Level 13  
    Posts: 731
    Rate: 417
    After two weeks, the return will see the same again with these backlash.
  • #16 20110402
    djszaman
    Level 11  
    Posts: 41
    Help: 3
    Rate: 110
    Manually, it is difficult to assess these clearances, and the sensor will have a few pulses missing and an error will be crashed. The encoder reset itself without replacing the switches should do the trick, but it's better to replace because the contacts may be overheated and not always catch
  • #17 20325149
    domis33
    Level 15  
    Posts: 222
    Help: 13
    Rate: 218
    Hello friend. I have the same problem - suggest how to RESET ENCODER - I will be very grateful.
  • #18 20325174
    djszaman
    Level 11  
    Posts: 41
    Help: 3
    Rate: 110
    @domis33 wrote a DM
  • #19 20325377
    domis33
    Level 15  
    Posts: 222
    Help: 13
    Rate: 218
    Thanks a lot. I will write if it helped.
  • #20 20326307
    domis33
    Level 15  
    Posts: 222
    Help: 13
    Rate: 218
    Thanks to my friend *djszaman* - on topic.
  • #21 20330841
    gsl24
    Level 8  
    Posts: 15
    Rate: 6
    djszaman wrote:
    @domis33 wrote a DM


    Hello and welcome,

    I see that the topic is new, so I will ask for help,

    For me, the elevator goes up and starts buzzing loudly but it looks like it is reaching the very end on an open housing, but the motor is still pushing,
    If I remove and press this microswitch, the elevator sets up correctly and goes down

    I can't fix it

    Regards,
    Tom

    Added after 2 [minutes]:

    Hi

    Will you share your knowledge about it
    How to do it?
  • #22 20330869
    djszaman
    Level 11  
    Posts: 41
    Help: 3
    Rate: 110
    There are 2 options. Since the button works and the machine reacts to its pressing, maybe its handle just needs to be tightened. Or something has come under the brewing cart where there is a screw on top and preventing it from reaching the end. They are mostly crushed coffee beans. De'Longhi ECAM 350.55B - Infuser Attachment Issue & Solution After Descaling Process
  • #23 20332700
    gsl24
    Level 8  
    Posts: 15
    Rate: 6
    @Dj Shaman

    Hi, thanks for taking a moment. If I don't press this button, it creaks to the max, but eventually it will go down and then it crashes the "attach the camera" error. So how to do this whole encoder reset? Maybe it will help...

    Regards,
    Tom
  • #24 20332824
    djszaman
    Level 11  
    Posts: 41
    Help: 3
    Rate: 110
    @gsl24 encoder reset is to restore the number of steps on the hall sensor. In your case, the brewing unit is clearly not pressing the microswitch. Only after removing the cause, you can possibly perform a reset so that the coffee machine saves new data
  • #25 20336813
    gsl24
    Level 8  
    Posts: 15
    Rate: 6
    djszaman wrote:
    @gsl24 encoder reset is to restore the number of steps on the hall sensor. In your case, the brewing unit is clearly not pressing the microswitch.
    Only after removing the cause, you can possibly perform a reset so that the coffee machine saves new data



    Hi,

    You were right,

    However, it was not the upper microswitch that unscrewed and the infusor itself did not reach the microswitch, after gluing the 1.5 mm thick rubber, the infusor presses the microswitch and the elevator goes down. The coffee is brewed correctly without leaking. I'm just worried that the brewer will fail after some time. Now how to do a reset so that everything works perfectly?


    Regards,
    Tom
  • #26 20336988
    djszaman
    Level 11  
    Posts: 41
    Help: 3
    Rate: 110
    You still haven't removed the cause, he should commute without gluing himself.
    As I wrote earlier, grains could come up or there is still an option that the propeller unscrewed and moved it back a bit, but it's more of a mess than cleaning the propeller itself. Reset here will not change anything and maybe even spoil it, I can send you instructions on how to do it, but you will do it at your own risk, because something is clearly wrong with this drive.
    I sent instructions in DM
  • #27 20373331
    Premos
    Level 2  
    Posts: 2
    The patent with a piece of rubber from a bicycle tube worked for me (I have a Delonghi ECAM 23.460). After replacing the Hall sensor, all gaskets, gear screws, removing all play, this message continued to pop up. I cut a small circle out of a bicycle tube and glued it to the piston element of the thermoblock that pushes the upper microswitch. After two days of digging and actually major renovation, it turned out that only a piece of rubber did the trick :)
  • #28 20373933
    djszaman
    Level 11  
    Posts: 41
    Help: 3
    Rate: 110
    @Premos replacing the hall itself without reset will not do anything, data on the number of steps is saved on the motherboard, so after replacing it had to be reset.
    That's why it didn't work after this general overhaul. Most likely, it was enough to just do a reset without digging and replacing anything.
  • #29 20374283
    gsl24
    Level 8  
    Posts: 15
    Rate: 6
    djszaman wrote:
    @Premos replacing the hall itself without reset will not do anything, data on the number of steps are saved on the motherboard, so after replacing it had to be reset.
    That's why it didn't work after this general overhaul. Most likely, it was enough to just do a reset without digging and replacing anything.



    Hello and welcome,

    Can we expand on the hall sensor?
    How exactly does it determine the destinations of the brew unit?

    Is a similar sensor a popular sensor mounted e.g. in the flap of the coffee machine door in Saeco / Philips to detect whether something is or is not in a certain place?

    Therefore, I believe that it marks the place of "rest" of the brewer in the "lying" position.
    Any deviation from the correct position would indicate a shift of the magnet itself.

    Remember that we have two positions "standing" and "lying". This should distinguish when what is the fault. Whether it's "laying down" or "getting up".


    These are my thoughts on it.
    Regards,
    Tom
  • #30 20374349
    Premos
    Level 2  
    Posts: 2
    djszaman wrote:
    @Premos replacing the hall itself without reset will not do anything, data on the number of steps are saved on the motherboard, so after replacing it had to be reset.
    That's why it didn't work after this general overhaul. Most likely, it was enough to just do a reset without digging and replacing anything.


    Could you please send me the encoder reset procedure? I will be grateful.

    Added after 2 [hours] 21 [minutes]:

    Hello and welcome,

    Can we expand on the hall sensor?
    How exactly does it determine the destinations of the brew unit?

    Is a similar sensor a popular sensor mounted e.g. in the flap of the coffee machine door in Saeco / Philips to detect whether something is or is not in a certain place?

    Therefore, I believe that it marks the place of "rest" of the brewer in the "lying" position.
    Any deviation from the correct position would indicate a shift of the magnet itself.

    Remember that we have two positions "standing" and "lying". This should distinguish when what is the fault. Whether it's "laying down" or "getting up".


    These are my thoughts on it.
    Regards,
    Tom[/quote]

    The sensor is screwed parallel to the gear pulley, in which there are four strong neodymium magnets (they demagnetized my magnetic screwdriver). A coil is clearly visible on the Hall sensor, which is excited by the magnets of the rotating pulley. I am not a service technician but an ordinary layman, but in my opinion the sensor only measures the number and speed of rotation of the pulley. De'Longhi ECAM 350.55B - Infuser Attachment Issue & Solution After Descaling Process

    Added after 8 [minutes]:

    From my experience, I think that's what he said djshaman it was enough to do a reset and everything would work, i.e. the system would learn to push the piston a fraction of a millimeter higher to turn on the upper microswitch. The rubber band is still working :)
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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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