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My machine is a DeLonghi Magnifica ESAM3500 , though this may apply to other models as well. It all started after I ran a descaling cycle on an otherwise faultless machine.

Symptoms:

  • Coffee would drip during the pre-infusion phase of brewing, then stop and continue brewing,
  • Too much coffee is brewed to the point of overflowing your cups
  • Rinsing cycle at power on/off takes too long and too much water is poured.

Needless to say the coffee tastes like crap.

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The solution was to replace the flowmeter (picture is of a different machine but the position of the sensor is the same): enter image description here

Here is the part in detail: enter image description here

In my case there was corrosion on the connector that was causing the sensor to malfunction, the chrome-plating on the lower part of the connector (the one that goes into the sensor) was eaten by the corrosion, this is how it looks after cleaning with WD40: enter image description here

I ended up replacing the whole sensor with a spare that i got from a friend that's into buying used/broken machines and refurbishing them for sale. Otherwise you can get them from ebay by searching for "delonghi esam flow-meter" and making sure what you buy looks exactly like the picture above.

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