Delonghi Magnifica 3500 not frothing

Dod you close the valve for the steam to escape and is there enough milk in the frother compartment?

The 'o' rings that come on the steam wand at purchase are rubbish. They come off easily without you even noticing when you remove the parts for cleaning after each frothing. The replacement o rings from DeLonghi do the same thing. I eventually went to my local coffee machine repair shop and got an o ring from them. It has never come off in the year and a half since. . . . . and I have no problems with my Magnification S. Now I LOVE my coffee machine!!!!!!

At wits' end DeLonghi Magnifica steam function - Coffee Forum

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Jun 1, 2012 - While I quite like the coffee it produces, the steam function seems to be ... it with the magic DeLonghi descaling solution, so I'm certain this is not ...

DeLonghi not producing steam Questions & Answers - Fixya

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Delonghi 3500s coffee machine not producing hot water or ...

steam inside the milk

Frothing jug
For milk frothing issues, soak the milk jug cover in hot water and rinse several times. If it has a froth control that can be removed by sliding in the direction of travel towards the edge whilst jiggling it gently up and down. Clean off the little o-ring with a toothpick, be gentle. The control should easily slide and click back in place when done.

Froth still no good? Examine the milk coupling to ensure the o-rings are in the right spot and are pliable and undamaged. There should be an o-ring (usually green) on the top spigot, a (black) o-ring at the front of the bottom spigot and a (red) oring at the rear. The groove halfway along the spigot should be clear. Now with the toothpick and a hot moist cloth clean all the crud from the milk coupling, especially inside the smaller spigot. Check the tiny hole at the back of the larger spigot is not blocked.

Check the flow from the hot water spout is good. If not, there are internal issues, try descaling. If it is, test the frothing jug, if it is still weak either the jug cover or the milk coupling needs to be replaced. Get them to try a known good test jug at your local coffee service center to find out which, most will be happy to do this at the counter.

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If no milk comes out of frother, check the o-ring on the upper "plug" where the milk jar connects to the machine. There are two connectors; only the bottom one corresponds to the steam output while the upper one is a plug. Mine had a worn out o-ring on the plug, and this keeps the machine from frothing milk.

You did not state anything about descaling, but every now and then, I also add water and descaler to the milk container and use the "Frothing" program to run through the water and descaling-solution (double-click the Cappuchino button).
I have also noticed that the first cup (and sometimes even the second) will produce less milk, and not as well frothed milk as later cups. My theory is that the machine is warmer when producing later cups.
If possible, you could try to run two-three frothings of plain water through before switching to milk. I realize this is inconvenient, but it could be worth testing this to see if it helps. We luckily have two milk containers and keep one filled with water just for the purpose of heating up (or whatever we do :) the frothing system before serving the first cappuchino.
Good luck!

I purchased a unit second hand for my wife's birthday today. It's only 4 months old, got it home, tested it, same problem... No froth!

I've read all the posts here and all were very helpful troubleshooting guides however they did not solve the issue.

Understanding how the frothing mechanism functions is half the battle in figuring out the solution. It's a simple vacuum type system. No doubt you've read about checking the orings. This is definately the first thing to check however if this is not the reason then consider the following.

The larger of the white tubes that has the red and black oring inserts deep into its port on the tap. Why? It pushes steam past the milk pipe directly into the chrome frothing tube which causes a vacuum essentially drawing milk up it's hose creating the froth. What you can't see without further investigation is that on the underside of the tube centered between the red and black orings is a small hole. This hole is responsible for drawing the milk upwards. If this is blocked, and it probably is then no milk and no froth. Use a really small screwdriver to carefully clean the white tube both from the front and the little hole underneath.

So in conclusion. Any air leak between the red and black orings will prevent the vacuum required to draw milk up the tube and alternatively any blockage of the milk channel will also obviously prevent the flow into the frothing mechanism. Hope this helps.