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Breville BES860 shutting down upon extraction

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  • Breville BES860 shutting down upon extraction

    Hello folks.
    As the title says, I have a Breville BES860 that shuts down immediately after pressing either 1 or 2 cup extraction buttons. I am lucky to get a few drops of water come out.
    Steam and grinder work fine.

    Any clues or fixes would be appreciated. Cheers 🙂

  • #2
    Define "shuts down". Doe the machine turn itself off or just return to the ready state?

    If possible, take a video. A lot easier to judge that way.

    Comment


    • #3
      It turns itself off.

      Comment


      • #4
        I will swap some parts over from my BES870 to trouble shoot and see what failed. Hopefully I don't kill the 870 in the process ��

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        • #5
          It sounds like it could be control board related, I don't know if the control boards are interchangeable. If you made a video like noidle22 suggested he'll likely be able to diagnose it, he's a repair tech.

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          • #6
            I will take a video later today.
            When no water is in the tank, it runs longer if that helps?

            Comment


            • #7
              Originally posted by AshMate View Post
              I will take a video later today.
              When no water is in the tank, it runs longer if that helps?
              Unsure why that would change the behavior, this machine has no water level sensing function. May be a coincidence.

              I think the possibilities in your machine are a faulty two way solenoid or faulty circuit board. As the machine functions normally for steam operation (the thermocoil and pump work at least), the solenoid would seem more likely.

              When the coffee function is used, the two way solenoid energises to close the relief to the drip tray. Once the shot has finished, the solenoid opens to release group head pressure.
              The three way solenoid remains un-energised during brewing, directing water to the group. When steaming, the three way solenoid energises to direct steam to the steam valve. The two way solenoid does not energise during steaming so if it had a problem, it would not be apparent here.

              If the solenoid coil has shorted or is drawing too much current, the machine could shut down. If this isn't the case, there could just be a random fault on the circuit board.

              Very difficult to diagnose further without getting inside the machine and performing some tests.

              Comment


              • damion
                damion commented
                Editing a comment
                Hi,
                Apologies to revive an old thread, but my BES860 has developed the same problem.
                However, it also turns off (all lights go off) during the grind process.
                I was about to replace the main PCB, but do you think it could actually be the solenoid ?

              • noidle22
                noidle22 commented
                Editing a comment
                I've done a few of these since this post. There's two mains filter capacitors on the control board that go bad and when the machine is under a heavy current load (grinder on and the thermocoil decides to heat up) then these capacitors give out and the machine shuts down.
                Not sure if the OP had solenoid problems or capacitor problems, I'd lean towards the capacitors now that I've had personal experience with it.

                Replacing these capacitors is pretty easy if you can solder. A new replacement circuit board is not an option anymore as they are discontinued, second hand would be the only choice for a replacement board now.

              • damion
                damion commented
                Editing a comment
                Thanks for the info noidle22.
                I presume you mean the 2 big ones in the bottom left ? - https://imgur.com/7L6PCis
                I'd somewhat given up on trying to replace any components since the entire board seems to be covered in epoxy or something.
                Any tips on removing that so I can remove and solder in new caps?

            • #8
              Thank you for the reply.
              The solenoids were my first thought. I was going to swap them over this weekend but didn't have time unfortunately. Busy busy.
              I will try to get onto it this week and if the problem persists, I will take a video and post it up. Cheers guys ��

              Comment


              • #9
                Well I just swapped over solenoids from my BES870 and the old 860 worked as it should. Time to hunt down a new solenoid.

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