I've got a several year old Gaggia 16002 espresso machine that does a fine job of making espresso, but a mediocre job of steaming milk. Its been on mothballs for the past year as I've favored french press coffee to the time consuming morning ritual that is cappuccino making. Now that my holiday vacation has started and my mornings are not rushed, I decided to roast an espresso blend and dust off the machine for a change.
This Gaggia has a small boiler, so properly frothing milk has always been a challenge. The problem has been compounded by a steam valve that hasn't been sealing well, so a lot of the steam gets vented through the group head rather than building up in the tank for the steam wand. Sitting (drained) for a year made the problem much worse, so it was time to take it apart and see what's going on. It was simpler than I had anticipated- I really should have done it as soon as the problem started. If for no other reason than to give everything a thorough cleaning. It seems running Urnex Cleancaf through the machine every few months (and a brush on the group head after every session) was no where near enough to keep things tidy. This is a photo of the group head (screen and steam valve removed) after a Cleancaf cleaning:
You can see coffee build up that the brush and solvents didn't touch, and hard water build up on the head assembly. This same build up was also present on the steam valve parts, which was preventing it from seating all the way, causing the steam lost through the group head during frothing attempts:
That part should be black, no grayish/green. (ignore the bubbles, I didn't bust out the camera until after it was soaking in Urnex).
Cleaning was pretty simple once it was all apart. I used my fingernail to scrape off the deposits on the valve part, so it wouldn't get nicked, and a stiff nylon brush and a dental pick to clean up the valve seat and group head assembly:
That's all it took to get the Gaggia back into shape for steaming. Looking forward to the cappuccinos tomorrow morning!


