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A De'Longhi espresso machine leaking water is telling you which seal gave up by where the water shows. Under the machine while idle: the reservoir or its docking valve. From the group head during shots: the group gasket. From the steam wand when closed: the steam valve seal. Out the bottom only during brewing: an internal hose clamp or, on hard water, scale forcing pressure out the overflow. The reservoir test below clears the most common suspect in one evening, no tools.
Read the leak
| Where / when | Cause | Fix |
|---|---|---|
| Under machine, idle | Reservoir crack or dock valve seal | Overnight towel test off the machine; replace the tank if wet |
| Around the portafilter during shots | Group gasket hardened | Replacement gasket, ten-minute swap |
| Steam wand drips when closed | Steam valve seal worn | Valve seal kit; snug the packing nut first |
| Bottom, only while brewing | Internal hose clamp or scale overflow | Descale first; persistent means an internal clamp reseat |
| Drip tray fills fast without leaking | Normal OPV purge, worsened by scale | Descale; fast filling is the machine venting excess pressure |
The two-minute checks before any parts
Reseat the reservoir with a firm press: the dock valve pin sticks after refills and weeps until seated. Check the drip tray is not simply full and wicking over its lip, the single most embarrassing "leak" in home espresso. Then run the overnight towel test on the filled tank away from the machine; a wet towel ends the investigation for the price of a replacement reservoir, and De'Longhi sells tanks for most Dedica, EC, and Magnifica models.
Scale: the leak that starts as a drip tray mystery
Hard-water De'Longhis push more and more water through the over-pressure valve into the drip tray as scale narrows the brew path, then start forcing it out seams. If the leak arrived alongside slower flow or weaker shots, descale before touching a screwdriver, using the machine's protocol (De'Longhi specifies its own solution and the cycle takes 25 to 30 minutes per its descaling FAQ, as covered in our Dedica guide). Never vinegar on these boilers, per descaler vs vinegar.
Gasket season
If shots leak at the portafilter rim and the handle locks further right than it used to, the group gasket has hardened; it is the same ten-minute rubber-ring swap as on every home machine of this class, and the same annual-ish rhythm for daily users. Magnifica bean-to-cup owners with internal leaks should start with the brew-unit reseat covered in our Magnifica guide before assuming seals.
Related reading
FAQ
Why is my De'Longhi leaking from the bottom? Idle leaks are the reservoir or dock valve; brew-time leaks are scale overflow or an internal clamp. The overnight tank test splits them.
Why does water leak around the portafilter? A hardened group gasket. Replacement is a cheap ring and ten minutes; locking the handle ever further right is the early warning.
Is a fast-filling drip tray a leak? No, it is the over-pressure valve venting, but scale makes it dramatic. A descale returns the tray to a slow fill.
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