I recently bought a vibiemme domobar junior (double boiler). It's a fantastic machine. I made the best espresso ever with this machine and my home roasted beans. There is only one problem. The temperature of the brewing boiler seems to be too high. A lot of steam is coming out of the the group head, also after a long cooling flush (about 60 seconds). That makes the coffee too hot to drink and it destroys the crema. When the machine is on for a short term i'm able to make a perfect cup. But when it's on for a longer time it gets too hot. I've played with:
* The maximum pressure: is now 9 bar
* Pressure of steam boiler: is now between 0.9 and 1.1
* Temperature of the brewing boiler. Whatever i do, there seems to be no difference in coffee temperature. There's still a lot of steam. I also changed the temperature when the machine is off.
Could there be an issue with the pressurestat of the brewing boiler, or the temperature/ pressure sensor of the brewing boiler? What could be the issue? What could be done to fix this problem? Does anyone have a more complete manual than the standard one in english or italian? Any idea's? I also mailed this question to vibiemme Italy. I got no reply ... that's a crying shame