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  • EM6910 stuck puck

    I have developed a new problem with the puck sticking to the shower screen of the EM6910. I can get it off by loosening the PF and using the manual button to deliver a one or two second burst of water.

    What are the likely causes for the puck sticking to the shower screen?

  • #2
    Re: EM6910 stuck puck

    It happened to me too yesterday.
    Maybe its the weather.
    Ill be looking forward to the answer as well.

    Comment


    • #3
      Re: EM6910 stuck puck

      Near perfect dispersion, smooth, level tamp, finer grind, all make a nice seal on the screen.

      Thats just my theory. :-/ Then again, it happens more with some machines than others.

      Comment


      • #4
        Re: EM6910 stuck puck

        I changed many variables over time as I try to get closer and closer to the perfect shot on demand. Some of the changes were to my dispersion and tamping technique. I now run a thin piece of metal through the coffee and tap the PF lightly to get as even distribution of coffee as possible before tamping. The tamp is now just a single steady push down, instead of several pokes followed by a handstand. The final polish is with almost no pressure - just the weight of my hand. I get better extractions now. However, I had the stuck puck problem even before I adopted the above technique.

        Would under/over dosing result in a stuck puck? If so, what is a good way to determine the correct dosing?

        Comment


        • #5
          Re: EM6910 stuck puck

          Originally posted by Dennis link=1226019023/0#2 date=1226020239
          Near perfect dispersion, smooth, level tamp, finer grind, all make a nice seal on the screen.

          Thats just my theory.  :-/  Then again, it happens more with some machines than others.
          I get this problem too. Does that mean im doing something right? :

          Comment


          • #6
            Re: EM6910 stuck puck

            It used to happen to me when the puck was a tad wet, not soppy like you can get when not dosed enough, but almost like it was borderline slightly under and may not have expanded enough in the basket to be held in firmly with the pressurised water.

            Comment


            • #7
              Re: EM6910 stuck puck

              Mine did it when it was brand new. We had to buy ground beans from a big cafe chain in Perth because we were waiting on Rocky coming in to the shop. Since then, I get my beans from a place that sends them the day they roast them, so they are 1 day old (usually), and it has never happened again.
              I dont know how fresh your beans are, but that could be something.

              Comment


              • #8
                Re: EM6910 stuck puck

                I get it as well from time to time but I thought it was the grind as when I adjust the grind a little courser it doesnt stick. But then again it only happens occasionally (except if you leave the PF in when you steam the milk) then it sticks every time. :

                Comment


                • #9
                  Re: EM6910 stuck puck

                  I always leave the pf in until after Ive poured the milk so I disagree that its a cause.

                  Comment


                  • #10
                    Re: EM6910 stuck puck

                    Ive been using the 6900/6910 for more than 2 years and have never had this occur.

                    I feel inadequate now :-(

                    Comment


                    • #11
                      Re: EM6910 stuck puck

                      Well all I can put it down to then is the relative humidity or perhaps the water quality or maybe the tamping or the grind or the time of day or was I standing to the right or left or maybe ;D ;D ;D ;D

                      Comment


                      • #12
                        Re: EM6910 stuck puck

                        It seems that using a little bit more coffee is helping things. I have not been able to definitively conclude that the dosing is the only variable making a difference, since increasing the dose also requires a slightly coarser grind.

                        Comment


                        • #13
                          Re: EM6910 stuck puck

                          Hi there,

                          Ive managed to get sticky pucks on several occasions using a EM6910/M4D Micrometric combination. Ive found that grinding a little finer fixes it.

                          Thinking it through has led me to believe the problem is caused by the grind being set between just right and course enough for the granules to not stick together. Ive started calling this the M&S grind (moist & sticky).

                          Im keen to hear if grinding finer fixes the problem for you as well.

                          Comment


                          • #14
                            Re: EM6910 stuck puck

                            Been playing around with it a bit more and im starting to believe its related to dosing as well. I googled wet puck and found other forums reporting the wet puck being caused by underdosing.

                            Comment


                            • #15
                              Re: EM6910 stuck puck

                              It seems I have two solutions to help with this:

                              1. More coffee, coarser grind, heavier tamp.

                              2. More coffee, same grind, lighter tamp.

                              It still happens every now and then, so I still dont have a clear idea of what the issue is. I am a little concerned about overdosing though, in light of the risk of damaging the collar.

                              Comment

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