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Likely a foreign object is blocking up the grinder. Remove all beans and run at coarsest grind to try to clear it, chase it through with more beans if necessary. If this does not clear it then the top burr of the grinder assembly can be removed after disassembling the machine. Mark the grinder coarseness cogs before moving them to assist reassembly. Moderately difficult procedure.
I had this same problem and discussed it with DeLonghi customer service. My machine was grinding 20 seconds for a double shot and ground coffee was coming out of the top and spilling over inside what a mess!
DeLonghi thought it was potentially a problem with the control board - grinding time too long - which is an expensive repair. I also called the local factory-authorized service and described the same problem. They asked what kind of beans I was using and I answered Starbucks espresso. They said that Starbucks is too oily, clogs the machine, and that I should try beans that are lighter. I also checked with an engineer who used to work at Starbucks and he made the same guess.
I tried an Italian roast espresso from a local market and it worked! I've had no problems since. The new beans cleaned out the oils and I'm getting great shots.
This is a good machine, but is best making single shots.
I would not do this as hazelnuts are oily and will probably gum up the grinder.
What you could do is but a few ground hazelnuts in the pre-gound chute at same time coffee beans are grinding. These will go into brewer unit at same time as coffee.
Please dont forget to vote this answer was helpful
Even a properly operating super automatic DeLonghi espresso machine makes enough coffee grinder noise to scare your pets and wake you next door neighbors. It's LOUD, no doubt about it. Only if your grinder makes more noise than that do you have a problem.
We just went through the same situation. We opened the top the Magnifica to get to the grinder and removed the four screws to seperate the grinding pieces. Inside we discovered two black fosilized beans/stones! We removed those, cleaned out all the bean dust and it is working like new! Took about an hour.