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To descale a DeLonghi Magnifica when the descale light flashes: pour DeLonghi descaler into the empty tank to the A mark, add water to the B mark, put a big container under the steam/hot water spout, and turn the steam knob to the I position. The machine runs solution through in bursts for about 25 minutes. Then close the knob, rinse the tank, fill to MAX with fresh water, and open the knob again to run the rinse cycle until the tank empties. Newer Magnifica Evo and display models run the same chemistry from a menu prompt instead of the knob.
The full procedure
| Step | What to do |
|---|---|
| 1. Prep | Empty the tank, add descaler to level A, water to level B |
| 2. Container | Place a 1.5+ liter container under the steam/hot water spout |
| 3. Run | Turn the steam knob to I; the machine pulses solution through, ~25 minutes |
| 4. Close | Knob back to O when the tank is empty |
| 5. Rinse | Rinse the tank, fill to MAX with fresh water, knob to I until empty |
| 6. Finish | Knob to O, refill the tank, brew and discard one cup |
Why the light comes back fast, or never goes off
The descale counter is driven by your water hardness setting, and most Magnificas ship assuming hard water; if you are on soft or filtered water, set the hardness level per your model's manual and the prompts space out honestly. A light that stays on after descaling usually means the cycle was interrupted or the machine wants the full rinse phase completed before it resets. Scale you can taste, metallic notes and thin crema, tracks with the symptoms in the Magnifica leak guide and the wider fix hub.
Use the right acid
DeLonghi's EcoDecalk is lactic-acid based and what the seals are rated for; generic citric descalers also work. Vinegar is the false economy: weaker on scale, hard on gaskets, and it haunts the next several cups. Every 2 to 3 months is the honest cadence on unfiltered tap water, monthly in genuinely hard-water areas, per DeLonghi's own guidance. If your machine grinds too, the burrs want attention on a similar schedule: grinder cleaning guide.
Related reading
FAQ
How do I descale my DeLonghi Magnifica? Descaler to level A, water to level B, container under the spout, steam knob to I for the ~25-minute cycle, then a fresh-water rinse cycle with the tank at MAX.
How often does the Magnifica need descaling? Every 2 to 3 months on typical tap water. Set your water hardness level in the machine so the descale light matches reality.
Can I use vinegar in a Magnifica? No. Use EcoDecalk or a citric descaler; vinegar is weaker on scale and rough on the seals.
Procedure per DeLonghi's Magnifica descaling guidance (delonghi.com).
Never miss a cycle: the free one-page Machine Maintenance Calendar (PDF) puts every daily, monthly, quarterly, and yearly task for espresso machines, drip, Keurig, and moka pots on a card you can tape inside a cabinet.
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