I have owned a Gaggia Coffee espresso machine for about 5 years now. After about a year, I noticed it gradually began to take longer and longer to pull my shots. It eventually started burning the shots and ruining the taste. Being a new espresso machine owner, I read up and found that I was supposed to de-scale on a regular basis. After trying several batches of different de-scaling brands, my wife found an article that traced a similar problem to a clogged orifice. I cleaned mine out and it worked a good as new. I have had to periodically do this. So, I thought, there must be others out there with the same problem and I might lessen their learning curve by sharing my experience. So if you are having a similar problem with your Gaggia Coffee espresso machine, try this:
Now, remove the drip tray, reservoir and cover. Then, place the machine on its back.
This will expose the shower holding plate.
Use a 5mm allen wrench to remove the two screws holding the shower holding plate in place. These can be snug. If you don’t use the correct size wrench, you will strip the heads – very bad!
You are now inside the brew group. You’ll probably notice lots of scale here but this isn’t the real problem. We are after the orifice housing located in the middle of the brew group.
Use the 12mm socket and 12mm open end wrench to separate the orifice housing into its two parts. I didn’t have a 12mm wrench handy so I used a pair of channel locks. However, this could round the corners of the soft metal so be very careful.
Now you’ll need to reassemble the orifice housing. Then replace it and the shower holding plate – be sure to align the holes in the plate to the holes in the brew group. With all of these items you’ll need to merely snug the pieces back together. The metals are very soft and will strip easily. If you over tighten, it will also make it very difficult the next time you have to do this.