John_Yossarian No, we have fixed the one which traveled to Naples. We wanted to test it for some time and then do the same thing with the others. I’m sure it will work with the rest as symptoms are exactly the same.
I don’t know. Our machines are not from the same year: mine is 2018, the one we have fixed is 2019 and, if I remember well, the other two are from 2020. My electrovalve is new, so it’s not a bad spare thing. If the design is similar, the machine will fail. I think air in the hx is causing the issue. Paolo asked us first to bypass the hx without taking the electro valve apart but it didn’t work as the valve did not avoid water to flow and there was not a leak but a water jet when the pump was on. When we put again everything in place (original set) the problem was much evident and it failed even at 120º. I think it was caused by the air in the hx circuit after reinstalling it. You could think purging the circuit letting pass water through it would do the trick but… no, I have tried it hundreds of times. Depending on how you are using the machine it can be difficult to detect. If you use it always with steam boiler on, you probably find the way to make espresso ok. But if you use it sometimes with steam, sometimes without steam, you will observe it does not work in the same way. Another factor is how espresso tastes. With milk is not as evident. Tasting plain espresso is different. When the machine fails, lot of pressure is aplied after preinfussion fase, this slows the flow and the espresso will taste dark and bitter. It’s a very big difference in taste.
We let you know about the other machines. One is close to us and we are trying this fix on it very soon.