De'Longhi Magnifica S Not Making Coffee? The Full Fix (Brew Unit, Grind & Spouts)
By Marco R. · Lead repair technician Updated June 17, 2026 
When a Magnifica S stops making coffee, it feels like a big failure — but on a bean-to-cup automatic the answer is nearly always one part: the brew unit. It’s the heart of the machine, it’s removable by design, and when it gets gummed up with damp grounds the coffee slows to a dribble or stops. The good news is you can pull it out and rinse it in two minutes, no tools.
Let’s work through it in the order that fixes the most machines first.
First, what exactly is happening?
- Grinder runs, but no coffee (or a few drops): brew unit or spouts clogged, or grind too fine. Causes 1–3.
- No grinding sound at all: a beans/grinder issue rather than brewing — check beans are feeding and the grinder isn’t jammed.
- Water comes through but coffee is watery/weak: grind too coarse or low dose — the opposite adjustment.
Cause 1 — Clogged or unseated brew unit (the usual culprit)
Why it happens: Every cup leaves a little moisture and grounds in the brew unit. Without a regular rinse, it cakes up and water can’t pass — so you get a trickle or nothing. A brew unit that isn’t clicked fully back in causes the same thing.
The fix:
- Switch the machine off and open the side service door.
- Press the two coloured release tabs together and pull the brew unit straight out.
- Rinse it thoroughly under warm running water — no washing-up liquid (detergent residue taints coffee and can damage seals).
- Let it drain for a few minutes, then slide it back in and press until it clicks home.
- Close the door and run a rinse/coffee.
Cause 2 — Clogged coffee spouts
Why it happens: The two spouts on the height-adjustable dispenser clog with dried coffee oils, so even a healthy brew unit can’t get coffee into the cup.
The fix: Pull the dispenser down, remove the spout cover if fitted, and clean the channels and the two outlet holes with a small brush or a damp cloth. A blocked spout often explains coffee that “stops” while the machine sounds like it’s working.
Cause 3 — Grind too fine, or oily beans
Why it happens: A too-fine grind packs the puck so tightly that water can’t push through; very dark, oily beans make it worse by gumming the chute and burrs.
The fix: Turn the grinder adjuster one step coarser — and crucially, only adjust it while the grinder is actually running, or you can damage it. Change one step at a time and test. Switch to a medium, less oily roast if you keep clogging.
Cause 4 — Scale restricting flow
Why it happens: Limescale narrows the water circuit until even a clean brew unit only manages a trickle. In hard-water areas this creeps up over months.
The fix: Run the machine’s descale cycle with a suitable descaler, following the on-screen prompts, then reset the water hardness/filter settings. See our descaling guide. If the descale light is on, this is likely your main cause.
Cause 5 — Water circuit not primed
Why it happens: After the tank runs dry or is removed, air can enter the circuit, so the pump moves air instead of water and no coffee brews.
The fix: Fill and reseat the tank, then run the hot-water/steam function until water flows steadily to purge the air. Then try a coffee again.
Repair or replace?
This is firmly repair territory — and most of it is free. A brew-unit rinse, a spout clean, a grind tweak and a descale solve the vast majority of “Magnifica not making coffee” cases. A replacement brew unit, if yours is genuinely worn after years of service, is an inexpensive part. There’s no reason this fault alone should retire the machine.
Stop it happening again
- Rinse the brew unit under the tap weekly.
- Empty the grounds container and drip tray regularly.
- Descale on schedule and keep the water filter current.
- Use fresh, medium-roast beans rather than very oily dark ones.
Frequently asked questions
My Magnifica S grinds but no coffee comes out — why?
It only makes a few drops or very weak coffee. What do I do?
How do I clean the Magnifica S brew unit?
Could it just need descaling?
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.