Cleaning a DeLonghi coffee machine with citric acid: a complete guide with nuances

Coffee machine DeLonghi is not just a household appliance, but a real assistant for gourmets, capable of delighting with aromatic espresso or cappuccino for years. However, even the most reliable equipment requires regular maintenance, otherwise scale, oily deposits and bacteria will turn your morning ritual into a test. Citric acid is one of the most accessible and effective means for decalcification, but its improper use can harm the mechanisms DeLonghi.

In this article we will analyze not only the standard cleaning procedure, but also hidden nuances, which the manufacturer often misses in the instructions. You will find out which models DeLonghi sensitive to acid concentration, how to avoid corrosion of seals and why coffee may taste different after cleaning. And also - unique algorithm for machines with the system Cappuccino System, where citric acid requires a special approach.

Why citric acid and not specialized products?

On store shelves you can find dozens of professional cleaners for coffee machines - from DeLonghi EcoDecalk to generic tablets Melitta. So why do many owners choose regular citric acid? It's all about three key advantages:

• 💰 Economical: a pack of acid (50 g) costs 5–10 times cheaper than branded products, and is enough for 10–15 cleanings.
• 🧪 Environmental friendliness: Does not leave toxic residue when rinsed correctly (unlike some chemical descalers).
• ⚙️ Versatility: Suitable for all models DeLonghi - from budget Dedica EC685 up to bonus La Specialista.

However, the method also has a downside. Citric acid is weak organic acid (pH ~2.1), which in case of overdose can:

• 🔥 Corrode rubber gaskets in the hydraulic system (especially in models older than 2018).
• ☕ Spoil the taste of coffee for 2-3 cycles after cleaning (due to residual sour taste).
• ⚠️ Cause false errors from water hardness sensors in cars with the system AquaPrima.

⚠️ Attention: If your DeLonghi equipped with an aluminum boiler (valid for models Eletta and Autentica until 2020), frequent cleaning with citric acid may accelerate corrosion. In this case, it is better to alternate it with neutral products like Urgenta.

How often should you clean your coffee machine? DeLonghi?

The frequency of decalcification depends on two factors: water hardness and intensity of use. The manufacturer recommends focusing on the scale indicator (if your model has one), but this is not always objective. Here are more precise criteria:

Water hardness (mg-eq/l)	Frequency of use	Recommended cleaning frequency
Less than 2 (soft)	1–2 cups/day	Every 3–4 months
2–4 (average)	3–5 cups/day	Every 2 months
More than 4 (hard)	More than 5 cups/day	Every month
Any	Use of milk/syrups	Additional cleaning Cappuccino System once every 2 weeks

How to determine water hardness? The easiest way is test strips (sold in pet stores for aquariums). If you don't have a test on hand, pay attention to signs of scale:

• 🔊 The machine has become louder (scale creates an additional load on the pump).
• ⏱️ Coffee takes longer to prepare than usual (the water supply channels are clogged).
• ☕ A white coating appears on the surface of the espresso.

Step-by-step instructions: how to clean properly DeLonghi citric acid

Before you begin, prepare:

• 🍋 Citric acid (food grade, without additives) - 30–50 g.
• 💧 1 liter of filtered or bottled water (not from the tap!).
• ⏳ 40–60 minutes of free time (the process cannot be interrupted!).
• 🧽 Clean cloth and container for collecting waste liquid.

Turn off the machine and let it cool for 10 minutes|

Remove the capsule/coffee in the holder (if present)|

Remove milk from the system Cappuccino System (if applicable)|

Prepare a solution: 30 g of acid per 1 liter of water (for hard water - 40 g)|-->

Step 1. Preparation of the solution

Compliance with proportions is critical! A solution that is too concentrated can damage internal parts, and a weak solution will not remove scale. Optimal ratios:

• For soft water: 25 g acid per 1 liter.
• For medium hard water: 30 g per 1 l.
• For hard water or if cleaning has not been carried out for more than 6 months: 40 g per 1 liter.

The water temperature should be room (20–25°C). Hot water will speed up the reaction, but may cause excessive foaming in the boiler.

Step 2: Start the cleaning cycle

1. Pour the prepared solution into the water tank.
2. Set the maximum serving size (for example, Double espresso or Lungo).
3. Place the container under the spout and start cooking no coffee (water only).
4. As soon as the solution begins to flow out, turn off the car and leave it for 20–30 minutes (the time depends on the degree of contamination).
5. After 30 minutes, turn on the machine and wait until all the solution has passed through the system.

Step 3: Rinse

This is the most important stage! Residues of acid can not only ruin the taste of the coffee, but also continue to corrode the seals. Wash the car at least 3–4 times:

1. Pour clean water into the reservoir and start the brewing cycle (without capsule/coffee).
2. Repeat the procedure until the water becomes completely clear.
3. For models with Cappuccino System Rinse the steam wand additionally: release steam into a container of water 2-3 times.

Cleaning features for different models DeLonghi

Not all coffee machines DeLonghi are the same - each series has its own design nuances that affect the decalcification process. Let's look at the most popular lines:

1. DeLonghi Dedica (EC685, EC785, EC885)

• ✅ Plus: The compact boiler is quickly washed (1 cycle of solution is enough).
• ⚠️ Nuance: These models have a weak pump - do not use a solution stronger than 30 g/l, otherwise you risk clogging the valve.
• 🔧 Advice: After cleaning, lubricate the O-ring of the coffee holder with silicone grease (included).

2. DeLonghi Magnifica (ESAM 3300, ESAM 4200, ESAM 6600)

• ✅ Plus: The automatic system notifies you when cleaning is required (indicator DECALC).
• ⚠️ Nuance: These models have two boilers - for coffee and steam. Both need to be cleaned, but the solution for the steam boiler should be weaker (20 g/l).
• 🔧 Advice: After decalcification, run the function Clean Me (available on the menu) for additional rinsing.

3. DeLonghi La Specialista (EC9335, EC9155)

• ✅ Plus: System Smart Tamping does not require disassembly for cleaning.
• ⚠️ Nuance: The touch panel is sensitive to moisture - wipe it with a dry cloth immediately after the procedure.
• 🔧 Advice: Only suitable for this series finely ground citric acid (large crystals can clog the filter).

⚠️ Attention: In models DeLonghi PrimaDonna (series S and EVO) an ultraviolet lamp is used to purify water. Citric acid can damage its coating - use only original products DeLonghi or Durgol.

Common mistakes and how to avoid them

Even experienced coffee machine owners sometimes make mistakes that ruin all their cleaning efforts. Here are the most common of them:

1. Using boiling water for solution
   

   Hot water speeds up the reaction, but may cause thermal shock in the boiler (especially in models with a ceramic coating). Always use water at room temperature.

2. Interrupting the cleaning cycle
   

   If you turn off the machine during a pause (while the solution is inside), the acid may crystallize in the tubes. The minimum holding time is 20 minutes.

3. Ignoring cleaning Cappuccino System
   

   Milk residue in the steam wand is an ideal environment for bacteria. After decalcification, be sure to rinse the system with steam and clean water.

4. Storing the solution for reuse
   

   Citric acid loses its effectiveness after the first heating. Never use the same solution twice.

What should I do if the machine does not turn on after cleaning?

If DeLonghi does not respond to buttons after decalcification, most likely the overheating protection sensor has tripped. Unplug the machine for 1 hour, then try again. If the problem persists, check whether the pump is blocked by scale residues (disassembly will be required).

Another common problem is filter clogged after cleaning. This happens if:

• Large acid crystals were used.
• The solution was not thoroughly mixed.
• There were mechanical impurities in the water (for example, rust from pipes).

Solution: Remove the filter (usually located in the water tank) and rinse under running water. As a last resort, replace it with a new one (the article number is indicated in the instructions for the model).

How to replace citric acid: alternative methods

If citric acid is not suitable for some reason (for example, due to sensitivity to its taste), consider alternatives:

Means	Pros	Cons	Suitable for DeLonghi?
Vinegar (9%)	Cheap, effective against scale	Strong odor, may damage rubber parts	❌ No (risk of corrosion)
DeLonghi EcoDecalk	Gentle composition, tasteless	Expensive (from 500 ₽ per bottle)	✅ Yes (recommended by the manufacturer)
Soda + water	Neutralizes acidity, gentle cleaning	Poorly removes scale	✅ Yes (for rinsing only)
Durgol Swiss Espresso	Removes even old scale	Difficult to find on sale	✅ Yes

For models with aluminum boiler (DeLonghi Eletta ECAM 45.760, Autentica ETAM 29.660) it is better to use specialized tools based on lemon salt (for example, Melitta Entkalker). They are less aggressive, but not inferior in effectiveness.

How to extend the effect after cleansing?

Decalcification is only half the battle. To your DeLonghi stayed clean longer, follow these recommendations:

• 💧 Use filtered water: Even if your area has soft water, a filter (e.g. Brita or Barrier) will remove mechanical impurities that accelerate scale formation.
• ☕ Rinse the holder after each use: Coffee oils oxidize and form a sticky residue that is difficult to remove.
• ⏱️ Do not leave water in the tank overnight: Stagnant water encourages bacterial growth.
• 🔄 Alternate cleaning products: for example, 1 time citric acid, next time - EcoDecalk.

💡

Regular cleaning not only extends the life of the coffee machine, but also improves the taste of the coffee. The scale acts as an insulator, causing the water to not reach the correct temperature and causing the extraction to not proceed properly.

For models with AquaPrima (DeLonghi PrimaDonna Soul, Eletta Explore) can be used replacement cartridges for water softening. They are expensive (from 1000 ₽ per piece), but completely solve the scale problem for 2-3 months.

FAQ: answers to frequently asked questions

Can I use lemon juice instead of citric acid?

No! Lemon juice contains sugars and organic matter that can clog the machine's pipes. In addition, its acidity is unstable (depending on the type of lemon), which makes the procedure unpredictable.

After cleaning, the coffee began to taste bitter. What to do?

This is a temporary effect - residual acid affects the taste. Rinse the machine 2-3 more times with clean water and do 1-2 “idle” cycles (without coffee). If the bitterness remains, check whether the filter in the holder is clogged - sometimes scale particles remain in small holes.

Is it possible to clean a car if it is not used daily?

Yes, but less often. For machines that are turned on 1-2 times a week, decalcification once every 4-6 months is sufficient. However, before cleaning, be sure to run 1-2 cycles with clean water to “wake up” the system.

What to do if the indicator DECALC Doesn't go out after cleaning?

Reset the error manually: for most models DeLonghi you need to hold the power button for 5–10 seconds. If the indicator continues to light, check the hardness sensor (it may be dirty) or contact service.

Is it possible to clean cars with a ceramic boiler with citric acid?

Yes, but with caution. Ceramic is acid resistant, but seals and gaskets are not. For such models (DeLonghi Dinamica ECAM 370) reduce the concentration to 20 g/l and reduce the exposure time to 15 minutes.