De'Longhi Magnifica S Leaking Water? Find the Source and Stop It
By Marco R. · Lead repair technician Updated June 17, 2026 
A puddle around a Magnifica looks alarming, but “leaking” spans everything from a drip tray you forgot to empty to a perished internal seal. Stop guessing and find where the water shows up first — each spot points to a different, usually cheap, fix.
First, locate the water
- In/under the internal drip tray: overflow first (Cause 1), then internal seals (Cause 5).
- Back, near the tank: tank seating or a crack (Cause 2).
- Around the brew-unit door / inside: brew-unit seals or trapped grounds (Cause 3).
- A little water in the tray at start-up/shutdown: normal automatic rinsing, not a leak.
Cause 1 — Overflowing drip tray (mistaken for a leak)
Why it happens: The Magnifica rinses its circuit into the drip tray at power-on and power-off, and adds the water from every brew. Leave it and it overflows onto the counter, looking exactly like a leak from underneath.
The fix: Pull out the tray and empty it. The red float pops up through the tray grate when it’s full — if you can see it, it’s overdue. Empty it daily.
Cause 2 — Water tank (seating or a crack)
Why it happens: The tank seals through a valve in its base. Seated at a slight angle, overfilled, or cracked, and it weeps at the back.
The fix: Remove the tank, check for hairline cracks (hold it full over a sink), wipe the valve and seating area, and reseat with a firm straight push until flush. Don’t fill past MAX.
Cause 3 — Brew-unit seals or trapped grounds
Why it happens: The removable brew unit seals against the machine with O-rings. Trapped grounds, a brew unit that isn’t clicked home, or perished seals let water escape around it.
The fix: Open the side door, remove the brew unit, rinse it under warm water (no detergent), clear any packed grounds from the chamber, check the rubber seals, and push it back until it clicks. A replacement brew-unit gasket/O-ring set is inexpensive if a seal has perished.
Cause 4 — Scale-related seepage
Why it happens: Heavy scale stops valves and seals seating cleanly, causing slow weeps, and stresses the whole circuit.
The fix: Run the descale cycle with a suitable descaler, then set your water hardness. See our descaling guide. It won’t fix a torn seal but resolves scale-related weeping.
Cause 5 — Internal hose or seal
Why it happens: Inside, water travels through hoses joined with seals and clamps. Age, heat and scale can let one weep, collecting under the machine.
How to confirm: If tray, tank and brew unit are all ruled out and water still appears underneath during operation, it’s internal.
The fix: This means opening the machine to find and reseat or replace the weeping connection — doable for the confident, but a job many owners hand to a technician.
Repair or replace?
Leaks are almost always a cheap repair: an empty tray, a reseated tank, a brew-unit rinse, a seal kit, or a descale handle nearly all of them. Only a serious internal failure on an old, out-of-warranty machine tilts toward replacement — and even then it’s usually a fixable seal. Under warranty? Contact De’Longhi first.
Stop it happening again
- Empty the drip tray daily; don’t overfill the tank.
- Rinse the brew unit weekly and click it home.
- Descale on schedule and keep the water filter current.
Frequently asked questions
Why is my Magnifica S leaking water underneath?
Water collects in the tray very fast — is that a leak?
It leaks around the brew unit area — what do I do?
Could scale cause leaks?
Marco spent twelve years servicing espresso machines — first behind the bench at a specialty café group, then running his own repair workshop. He has stripped down, fixed and reassembled everything from a battered Gaggia Classic to high-end Swiss automatics. He writes the fixes here only after reproducing the fault on a real machine, and he'll always tell you when a repair isn't worth the money.