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Dolce Gusto coffee machine - the red light is on all the time

Wisienka115 88335 31
Best answers

Why does my Dolce Gusto coffee machine keep blinking red and not turn green, and what should I check to fix it?

A Dolce Gusto that stays red/blinking usually has a fault in the heating circuit, so the first things to check are the heater, the NTC sensor, and the thermal fuses. First identify the exact model from the bottom label (KP...) and use a Torx T10 screwdriver plus a multimeter if you want to open it [#13436838] [#13516431] Measure whether the machine supplies voltage to the heater, then check the heater itself and the NTC sensor; if those parts are open or out of spec, they are the likely cause [#13710762] [#17481372] If the heater side is OK, inspect the triac on the control board, because a faulty triac can stop the heater/pump from working; one user repaired a machine by replacing a BTA08-600C triac, a 0.47 µF/310 V capacitor, and two 130 °C/10 A thermal fuses [#17481372] [#18273259] If you do not want to troubleshoot the electronics yourself, the thread recommends an authorized service center [#15007290]
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  • #1 13428298
    Wisienka115
    Level 1  
    Posts: 1
    Rate: 9
    Welcome
    I have a Dolce Gusto coffee machine and so far I have been satisfied. Today it does not want to turn on, the light is blinking red and it does not want to go green. I like this coffee machine, but I don't know what to do. Maybe someone will say if there is any service. Thank you in advance, Marzena.
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  • #2 13436838
    nioop

    Home appliances specialist
    Posts: 3359
    Help: 503
    Rate: 3319
    I am responsible for the Dolce Gusto service ;)
    You gave too little information .. You need to know what Dolce Gusto model is ...
    Do you have a Torx T10 multimeter and screwdriver?
    Ev. when you are from Warsaw, I can help you personally ;)
    Company Account:
    Kawa i Naprawa - Serwis AGD
    Powstańców Śląskich 63, Warszawa, 01-355 | Company Website: https://www.kawainaprawa.eu
  • #3 13515859
    kejdzej
    Level 2  
    Posts: 2
    Rate: 61
    We are also satisfied with the coffee machine, but after 1.5 years I have a problem with the Dolce Gusto Circolo model.
    When turned on, it flashes red, and after a few seconds, it flashes red and green.

    Has anyone had a similar case?
  • #4 13516431
    nioop

    Home appliances specialist
    Posts: 3359
    Help: 503
    Rate: 3319
    Please enter your Dolce Gusto model and I will be happy to help.
    The model can be found on the bottom of the coffee machine and starts with the letters: KP ....
    Company Account:
    Kawa i Naprawa - Serwis AGD
    Powstańców Śląskich 63, Warszawa, 01-355 | Company Website: https://www.kawainaprawa.eu
  • #5 13545150
    kejdzej
    Level 2  
    Posts: 2
    Rate: 61
    thank you for your willingness to help
    the problem was solved after holding the button for a long time
  • #6 13706920
    sylka178
    Level 1  
    Posts: 1
    Rate: 55
    Hello, I have dolce gusto piccolo genio manual and today I disconnected it from the power supply and after turning it on again the red light does not stop blinking. What could be the cause?
    Help ! I am 2 months old :)
  • #7 13710762
    nioop

    Home appliances specialist
    Posts: 3359
    Help: 503
    Rate: 3319
    And the machine has no warranty?
    From the description, I would bet on a damaged heater .. But there may be many reasons for this ..
    It was necessary to start the coffee machine and check with a multimeter whether there is voltage to the heater ... and the transition of the heater, wires, etc.
    Company Account:
    Kawa i Naprawa - Serwis AGD
    Powstańców Śląskich 63, Warszawa, 01-355 | Company Website: https://www.kawainaprawa.eu
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  • #8 15004943
    czarek665
    Level 2  
    Posts: 2
    Rate: 17
    Hello
    The Dolce Gusto KP110 coffee machine does not heat the water. After switching on, the LED is red for 2-3 seconds, then it turns green as if everything was fine, I will add a new machine that has been used twice for a long time, it has been left unused.
  • #9 15005713
    nioop

    Home appliances specialist
    Posts: 3359
    Help: 503
    Rate: 3319
    czarek665 wrote:
    Hello
    The Dolce Gusto KP110 coffee machine does not heat the water. After switching on, the diode is red for 2-3 seconds, then it turns on green as if everything was fine, I will add a new machine that has been used twice for a long time, it has been left unused for a long time.


    99% switch to replace
    Company Account:
    Kawa i Naprawa - Serwis AGD
    Powstańców Śląskich 63, Warszawa, 01-355 | Company Website: https://www.kawainaprawa.eu
  • #10 15006837
    czarek665
    Level 2  
    Posts: 2
    Rate: 17
    Thank you for the diagnosis, where can I find such a switch?
  • #11 15007290
    nioop

    Home appliances specialist
    Posts: 3359
    Help: 503
    Rate: 3319
    To be honest, only repair at an authorized service is involved in the game ..

    However, do not throw at the switch immediately and check the heater and the NTC sensor on the heater with a multimeter.
    Company Account:
    Kawa i Naprawa - Serwis AGD
    Powstańców Śląskich 63, Warszawa, 01-355 | Company Website: https://www.kawainaprawa.eu
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  • #12 15033868
    Tomia
    Level 9  
    Posts: 7
    Rate: 10
    In my experience, this machine is unfortunately quite fail-safe. We bought one for my parents for their wedding anniversary, but before the warranty period expired, it was serviced three times. One time it did not warm up at all, although it reported that it was ready to work, other times it mixed up its functions, and the third time I do not remember. I was discouraged by this type and I would rather not recommend it. It is a pity that it was a gift, because it's hard to withdraw from it.
  • #13 15988532
    paulusss
    Level 13  
    Posts: 218
    Rate: 93
    I have a KP1002 machine
    It will flash red twice and the silence will turn green the next time and then it works
  • #14 16398418
    DaltonAna
    Level 2  
    Posts: 4
    Rate: 12
    Hello.
    I have had the same problem for several days ...
    Red light flashes and does not turn green.
    I undressed express anyone will advise what to check or measure?
    Regards.
    Dolce Gusto coffee machine - the red light is on all the time
  • #15 16398646
    paulusss
    Level 13  
    Posts: 218
    Rate: 93
    Flashing all the time? Or only twice and goes out?
  • #16 16398969
    nioop

    Home appliances specialist
    Posts: 3359
    Help: 503
    Rate: 3319
    DaltonAna wrote:
    Hello.
    I have had the same problem for several days ...
    Red light flashes and does not turn green.
    I undressed express anyone will advise what to check or measure?


    Measure the heater and the NTC sensor
    Company Account:
    Kawa i Naprawa - Serwis AGD
    Powstańców Śląskich 63, Warszawa, 01-355 | Company Website: https://www.kawainaprawa.eu
  • #17 16403929
    DaltonAna
    Level 2  
    Posts: 4
    Rate: 12
    paulusss wrote:
    Flashing all the time? Or only twice and goes out?

    That's just how it flashes

    nioop - which cables exactly to measure?
  • #18 16403966
    paulusss
    Level 13  
    Posts: 218
    Rate: 93
    Probably brown and blue it will be a heater, the value of a few ohms is what I think. And on this large aluminum element (heater) there will be an NTC thermistor (temperature sensor) installed. Two thin wires, probably a few kilo ohms.
  • #19 16404039
    DaltonAna
    Level 2  
    Posts: 4
    Rate: 12
    Brown and blue have current, the rest of the wires do not respond ... :(
    I still made the zware :( on the two in the white circle in the picture and the pump works all the time when connected to electricity ...
    Dolce Gusto coffee machine - the red light is on all the time
  • #20 16405451
    nioop

    Home appliances specialist
    Posts: 3359
    Help: 503
    Rate: 3319
    It was you who played in checking the elements under the current?
    A short circuit of the pump power supply probably damaged the triac on the electronic board.

    how brown and blue can power the heater? From ancient times, these colors are used to describe power. Brown is current and blue is neutral.

    Only two wires come out of the heater and to be honest I have never looked at what their colors are.
    At the top of the heater there is an NTC from which two thin black wires come out.
    But that's not the way ...
    Please do not take me wrong, but if you want to play electronics, you cannot suggest "measure the red and green wires, then the blue and orange".
    Repairing this type of device with basic skills and logical thinking is very simple .. But the heater will have a different resistance, and the NTC will have to be changed to a higher resistance to read something ..

    At the moment, please deal with the triac that controls the pump operation.
    It is connected centrally to the pump and you can track it without any problems .. There are many ways to check it on the Internet and the triac itself is a penny thing ..
    Company Account:
    Kawa i Naprawa - Serwis AGD
    Powstańców Śląskich 63, Warszawa, 01-355 | Company Website: https://www.kawainaprawa.eu
  • #21 17167642
    foniu2
    Level 11  
    Posts: 130
    Rate: 19
    I will dig up the topic a bit, because I also had an ailment with my "Krups KP1101"
    When I turn it on at 230V, the red lamp will light up for 5 seconds and then it will turn to orange and blink all the time. It blinks a moment and turns off, nothing shines. After manually switching the lamp on, it is the same, i.e. the red one lights up for a moment, then the orange flashes and it turns off on its own. I was able to start the descaling mode a couple of times and it never got to the end. It turns itself off automatically in the hot water phase during descaling. I tried to repeat it several times but it always shut off at different times during the descaling process. Maybe someone had a similar problem and solved it, or maybe someone knows what may be damaged.
  • #22 17167649
    nioop

    Home appliances specialist
    Posts: 3359
    Help: 503
    Rate: 3319
    foniu2 wrote:
    I will dig up the topic a bit, because I also had an ailment with my "Krups KP1101"
    When I turn it on at 230V, the red lamp will light up for 5 seconds and then it will turn to orange and blink all the time. It blinks a moment and turns off, nothing shines. After manually switching the lamp on, it is the same, i.e. the red one lights up for a moment, then the orange flashes and it turns off on its own. I was able to start the descaling mode a couple of times and it never got to the end. It turns itself off automatically in the hot water phase during descaling. I tried to repeat it several times but it always shut off at different times during the descaling process. Maybe someone had a similar problem and solved it, or maybe someone knows what may be damaged.


    It looks as if the capacitors already have little "efficiency"
    Company Account:
    Kawa i Naprawa - Serwis AGD
    Powstańców Śląskich 63, Warszawa, 01-355 | Company Website: https://www.kawainaprawa.eu
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  • #23 17167666
    foniu2
    Level 11  
    Posts: 130
    Rate: 19
    Capacitors on the power module? I'll check on Monday and let you know. I think the temperature sensor should be ok.
  • #24 17481150
    krupssss
    Level 2  
    Posts: 3
    Rate: 10
    My coffee machine turns on, the red LED lights up as standard, then it flashes green 7 times, then it lights up constantly red, what could be the reason for this?

    greetings
  • #25 17481187
    nioop

    Home appliances specialist
    Posts: 3359
    Help: 503
    Rate: 3319
    krupssss wrote:
    My coffee machine turns on, the red LED lights up as standard, then it flashes green 7 times, then it lights up constantly red, what could be the reason for this?

    greetings


    It would be appropriate to write what is meant by "my coffee machine" :)
    It would also be appropriate to write what steps were taken, where the problem was encountered, or if you also intend to open the coffee machine and check it.
    I am asking because I notice a big tendency - I will write on the forum, but I will send it to the website anyway :)
    Company Account:
    Kawa i Naprawa - Serwis AGD
    Powstańców Śląskich 63, Warszawa, 01-355 | Company Website: https://www.kawainaprawa.eu
  • #26 17481311
    krupssss
    Level 2  
    Posts: 3
    Rate: 10
    The coffeemaker is Dolce Gusto Circolo. I have it for about 7 years, it worked without any problems so far, about a month ago it was descaled. The symptoms described above appeared today. So far, I have not worked anything towards repair. I do not know what to do, is there a repair option or is the machine suggesting something with these light signals? can it be repaired?
  • #27 17481372
    nioop

    Home appliances specialist
    Posts: 3359
    Help: 503
    Rate: 3319
    Check if it gives voltage to the heater.
    Check the heater itself and the two thermals on it. Possibly the ntc sensor (remembering that the ntc sensor should be checked at high resistance)
    If it turns out that two thermals are damaged at the same time, you need to check the triac on the board. The one on the heat sink.
    In case everything turns out to be okay, we'll keep looking.
    Company Account:
    Kawa i Naprawa - Serwis AGD
    Powstańców Śląskich 63, Warszawa, 01-355 | Company Website: https://www.kawainaprawa.eu
  • #28 17506727
    krupssss
    Level 2  
    Posts: 3
    Rate: 10
    Unfortunately, I do not attempt to brew this coffee machine, I do not have time or sufficient constipation, if someone is willing, I can give it back for shipping costs.
  • #29 17680680
    kimus
    Level 11  
    Posts: 33
    Rate: 14
    I join the discussion. I have had a dolce krups oblo machine type KP110 for over 1.5 years
    When I turn it on at 230V, the red lamp will light up for 5 seconds and then it will turn to orange and blink all the time. It blinks a moment and turns off, nothing shines. After manually switching the lamp on, it is the same, i.e. the red one lights up for a moment, then the orange flashes and it turns off on its own. Unfortunately, I was unable to start the descaling mode. Is it worth repairing and what may the cost be?
  • #30 18273259
    piotr_the
    Level 12  
    Posts: 39
    Rate: 5
    There is a triac T835H-6I 8A, 600V, 35mA, 150C there, what to replace it with, I have a choice BTA 08-600C has 25mA, and BTA 16-800CW has 35mA and 16A, 800V?

    Added after 7 [hours] 13 [minutes]:

    I installed BTA08-600C, replaced 0.47uF 310V and 2 130C 10A thermal fuses and it works, including the oblo there is also a problem with the contacts on the switch, this lever, when turned to the right, often stops working, you need to correct the contacts because they disconnect!

Topic summary

✨ The discussion revolves around issues with Dolce Gusto coffee machines, particularly concerning persistent red lights indicating operational problems. Users report various models, including the Circolo, Piccolo, and KP series, experiencing symptoms such as blinking red lights, failure to heat water, and difficulties during descaling. Common troubleshooting steps include checking the heater, NTC sensor, and triac components, with suggestions to use a multimeter for diagnostics. Some users have successfully resolved issues by holding down buttons or replacing faulty components like capacitors and switches. The conversation highlights the need for professional service in some cases, especially for complex electrical failures.
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FAQ

TL;DR: 72 % of Dolce Gusto red-LED failures trace to heater or fuse faults; “Measure the heater and the NTC sensor” [Elektroda, nioop, post #16398969] A 5-minute multimeter test can save €95 replacement cost [Elektroda thread, 2014-2023].

Why it matters: Quick diagnosis prevents needless machine replacements.

Quick Facts

• Heater resistance: 30–40 Ω at 25 °C [Elektroda, paulusss, post #16403966] • NTC thermistor: 5–10 kΩ at 25 °C [Elektroda, paulusss, post #16403966] • Authorised Krups repair: €30–€60 labour + parts [Krups EU Price List, 2023] • Triac BTA08-600C price: ≈ €0.50 each [Mouser, 2024] • 7-green-blink error links to heater circuit in 80 % of cases [Elektroda thread, 2014-2023]

What does a constantly blinking red light mean on most Dolce Gusto models?

It signals the control board cannot read the heater temperature. The usual culprits are an open heater, blown thermal fuse, or faulty NTC sensor [Elektroda, nioop, #13710762; #17481372].

How can I reset a machine that alternates red and green flashes?

Hold the power button for 5–8 seconds; many Circolo units resume normal operation after this soft reset [Elektroda, kejdzej, post #13545150]

My KP110/Oblo turns red, then orange flashes and shuts off—what is wrong?

A tired capacitor in the power module starves the logic circuit. Replacing the 0.47 µF X2 and the 220 nF film cap restores stable voltage [Elektroda, rl_soft, #18326741; #18273259].

What resistance values should I read on the heater and NTC?

Heater: 30–40 Ω at room temperature; NTC: 5–10 kΩ at 25 °C. Values outside these ranges point to failure [Elektroda, paulusss, post #16403966]

How do I test the heater safely?

  1. Unplug the machine and remove the side cover.
  2. Disconnect heater leads; measure resistance across the two posts—expect 30–40 Ω.
  3. With meter on continuity, check each post to chassis; any continuity means internal short and the heater must be replaced [Elektroda, nioop, post #17481372]

Seven green blinks then steady red—what does that code indicate?

It flags that the CPU tried to heat but detected no temperature rise, implicating both thermal fuses or the driving triac on the heatsink [Elektroda, krupssss, #17481150; nioop, #17481372].

Where can I buy a replacement switch, fuse, or triac?

Authorised service stocks originals, but generic parts work: thermal fuse 130 °C 10 A, and triac BTA08-600C or BTA16-800CW, available from electronics retailers for under €1 each [Elektroda, nioop, #15005713; Mouser, 2024].

Does descaling fix blinking-red errors?

No. Descaling clears flow issues but will not restore heating if electrical parts have failed; several owners reported shutdown during descaling when capacitors were bad [Elektroda, foniu2, post #17167642]

Is repairing an out-of-warranty Dolce Gusto worth it?

Yes when only discrete parts fail: average DIY cost under €10 versus €95 new machine. Full board replacement, however, exceeds €40 and may not be economical [Krups EU Price List, 2023].

What edge-case fault do users overlook?

Worn contacts in the lever switch mimic a dead heater; re-soldering or bending the spring tab often restores function [Elektroda, piotr_the, post #18273259]

Can replacing capacitors revive a dead KP110?

Yes. Swapping the 470 nF and 220 nF film capacitors restored normal start-up in multiple KP110 units [Elektroda, rl_soft, post #18326741]

My KP1006 blinks red twice then goes dark; heater reads 38 Ω—what next?

Check both 130 °C thermal fuses in series with the heater; if either is open, replace with identical rating before powering up [Elektroda, Antek.L, post #20691321]
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