DavecUK Scale feels unlikely to me as I have always filtered my water, plus, my tap water is soft already at 35-55ppm total hardness.

No random ticking today, so this is not a 24/7 thing.

    Spoke too soon. Ticking every half a second out of nowhere now. Been plugged into the wall all day, used 7 hours ago. Driving me insane.

      soundwave1 -is it loud for you that you can actually hear it without putting your ear right next to the machine?

      Maybe open the machine and try to pin point where it comes from?

          MediumRoastSteam yep, I can hear it from about 7 meters away in an open plan kitchen/living.

          I took the lid off, and honestly, not any easier to pin point. The ticking is just ‘in there’, it’s quite bizarre. Doesn’t seem louder or more obvious in any location.

              soundwave1 - can you video it? For me, I have to physically make contact with the machine with my ear. How strange! I tried to use the phone mic to capture but for me no luck!

                  MediumRoastSteam sorry for the poor video, my kids were watching Paddington bear!

                  Video

                  This is the loudest and fastest it has ticked. A few hours later now, it’s fine back to a slowwwww softer tick.

                      soundwave1 😱😱😱😱- presumably the machine is turned off at another source, and if you unplug it, the noise remains, correct?

                          soundwave1 - if the ticking stops immediately after turning the machine on, it must be related to the electrics (e.g.: ticking stops as soon as there’s electricity flowing through).

                          It’s just bizarre!

                          Ps: did you try emailing lelit directly (care at lelit dot com)? I wonder if they might have a more sensible explanation than us here!