Good and often decalcification and general cleaning inside the machine will prevent most issues. When water, (some but not much) comes out of the steamer when it’s not supposed to (e.g. during the brewing process), the first thing to check is the steamer assembly (behind the control panel) including where the water “hose” that feeds the steamer is coming from. But generally speaking, regular decalcification/cleaning is the best prevention.
ALSO, if anyone knows a website how to calibrate the coffee grinder, please let me know my email is R1100R (at) gmail (dot) com (<— written this way to deter spamming). I am not talking about the external rotating button in the hoopper that goes from 1 to 7 in about 13 clicks. I mean the entire assembly underneath. I had to remove it and clean thoroughly as some beans were stuck in there and blocking the machine from working. Apparently there is a “trick” putting the grinding mechanism back together which I am not aware of. Help me please if you can.
There is only one service location in my area (NW Chicago subburbs), but it is ~2 hours away from me, it is not a DeLonghi facility but a 3rd party company, and they charge an arm and a leg (~$100 just to walk in the door to drop off the machine (they call it “diagnostic fee”) plus another $100 per hour labor, plus of course extra for parts which they do not have all of them always available. I love my ESAM3300 but service and parts is such a big problem. When this one kicks the bucket I am trying a different brand for sure.