Owners of automatic coffee machines Delonghi Often faced with a situation when the device ceases to delight with a rich taste or begins to make strange sounds when grinding. This is not always a sign of a breakdown. In most cases, the root of the problem lies in incorrectly selected raw materials. The automation of Italian engineers requires maintaining a balance between the hardness of the grain and its oiliness.
Using the wrong beans may clog the infuser or, conversely, cause water to flow through the tablet too quickly. The result is either a bitter slurry or a watery drink without crema. Understanding the physics of the extraction process and the chemical properties of coffee helps you prolong the life of your equipment and enjoy the perfect cup every morning.
In this article we will look at which varieties and degrees of roasting are optimal for carob and automatic models. Delonghi. You will learn why cheap supermarket coffee can be more dangerous for your machine than no decalcification, and how to properly adjust the grind for a specific pack of beans.
Criteria for selecting grains for automatic systems
The first thing you need to pay attention to when purchasing is the degree of roasting. For automatic coffee machines, including popular series Magnifica and Dinamica, the level of grain carbonation is critical. Overly dark, over-burnt French Roasts often contain excess oils on the surface.
These oils will stick to the burr walls and feed channels, creating a thick coating that eventually turns into a crust. This makes it difficult for the mechanism to work and changes the taste of the drink, adding rancidity to it. On the other hand, too light roast (Light Roast) has high density and acidity, which requires a very fine and uniform grind, which is not available to every household device.
The optimal choice is medium or medium-dark roasting Such grains have sufficient fragility for quick and high-quality crushing, but do not yet emit excessive amounts of oils. It is this balance that allows the grinding unit to operate normally without overload.
- 🔍 Pay attention to the roasting date: ideal coffee for a machine is from 2 to 6 weeks after production.
- 🚫 Avoid grains in glaze (with added syrups), they are guaranteed to “clog” the millstones with a sugar crust.
- ⚖️ Mixtures containing up to 20-30% robusta produce denser foam (crema), but increase acidity.
⚠️ Attention: Never put caramelized or flavored coffee into the hopper of your coffee machine. Sticky additives tightly stick the millstones together, and cleaning them will require complete disassembly of the unit at a service center.
The freshness of the product plays no less a role than the variety. Old grains lose carbon dioxide, which is necessary to form the correct tablet structure when pressed. If coffee is stored for more than 6-8 months after roasting, even the most expensive machine will not be able to squeeze out the rich flavor from it.
Technical requirements: grinding and grain hardness
Grinding mechanism in coffee machines Delonghi designed for a specific hardness of the starting material. Millstones, be they steel or ceramic, have a limited resource. Trying to grind excessively hard, undercooked grains leads to increased wear on the bearings and motor.
It is also important to consider the moisture content of the grain. Overdried coffee produces a lot of dust (fraction), which can seep through the seals of the brewing unit, dirtying the internal mechanisms. Conversely, grain that is too wet will get stuck in the feed channel, causing “No Coffee” errors or a jammed auger.
Why does cheap coffee from the supermarket ruin your car?
Cheap varieties are often treated with steam or chemicals to speed up ripening, which changes the fiber structure. When grinding, such a mass behaves unpredictably: it either turns into dust, clogging the mesh, or sticks together into lumps, blocking the passage of water. In addition, such mixtures have a high percentage of defective grains, which create uneven pressure in the group.
Adjusting the grind level is a key owner skill. There is usually a regulator on the machine body that can only be turned while the coffee grinder is running. If the coffee stream flows too quickly and the drink is light, turn it towards Fine. If the machine hums, but the coffee does not come out, increase the grind (Coarse).
The stability of the fraction size directly affects the pressure in the system. An ideal tablet should hold a pressure of 9 bar. If the grind is too coarse, the water will pass through the coffee in 10-15 seconds instead of the required 25-30, and the extraction will not have time to complete.
- 🔧 Adjust the grind only when the coffee grinder is turned on to avoid damaging the gears.
- 🌡️ The temperature of the water in the machine is fixed, so you can compensate for the taste only by the degree of grinding.
- 📉 Fine grinding increases the strength, but increases the risk of clogging the choking system.
Comparison of varieties: Arabica, Robusta and blends
The choice between 100% Arabica and Robusta blends is a matter of personal preference and the technical capabilities of the machine. Clean Arabica gives a complex, multifaceted taste with notes of fruits, flowers and berries. However, it is less dense and contains less caffeine, which affects the density of the crema.
Robusta, in turn, has a simpler, earthier taste and high strength. Its main feature for the owner of a coffee machine is the ability to create thick, stable foam due to the high content of soluble substances and oils. Adding 10-20% Robusta to a blend often does wonders for the quality of espresso at home.
| Characteristics | 100% Arabica | Blend (80/20) | 100% Robusta |
|---|---|---|---|
| Taste | Acidic, fruity | Balanced | Bitter, earthy |
| Crema (foam) | Light, settles quickly | Dense, golden | Very thick, dark |
| Millstone load | Average | Low (optimal) | High (hard grains) |
| Recommendation Delonghi | Yes (light roast) | Perfect | Not recommended |
For daily use in automatic machines Delonghi Classic Italian blends are best suited. They have already been combined by technologists taking into account the characteristics of espresso machines: the correct acidity, density and oil. It is better to experiment with mono-varieties from Ethiopia or Kenya on carob machines with an external burr grinder.
It is also worth mentioning decaffeinated coffee. The decaffeination process makes the bean more porous and brittle. When grinding, it often produces a lot of dust, which requires less frequent cleaning of the brewing unit. If you only drink decaffeine, be especially careful about your shower screen.
The optimal choice for Delonghi is an 80/20 medium roast blend of Arabica and Robusta from a local roaster, providing balance of flavor and respect for the mechanism.
Packaging and storage: oxidation protection
Coffee is a hygroscopic product that actively absorbs odors and moisture from the air. For an automatic coffee machine, it is important that the beans remain dry and free-flowing until they enter the millstones. Improper storage negates all the benefits of an expensive variety.
The best packaging is considered to be a bag with degassing valve (round flap on the front side). It allows carbon dioxide to escape without letting oxygen in. If you buy coffee by weight, be sure to pour it into an airtight jar made of dark glass or opaque plastic.
Storing coffee in the refrigerator or freezer is a common mistake. Sudden temperature changes when removing the bag lead to moisture condensation on the grains. Wet coffee in the hopper of a coffee machine is a direct path to the formation of mold in the supply channels and souring of the residues inside the mechanism.
- 🌡️ Ideal storage temperature: from +5 to + 20°C away from heat sources.
- ☀️ Direct sunlight destroys aromatic oils, store coffee in the closet.
- 🍚 Do not store coffee next to spices or household chemicals - the grains will absorb extraneous aromas.
⚠️ Attention: If you have poured beans from the original pack into a container, do not throw away the label with the roasting date and variety name. Glue it on the container or take a photo to know the “age” of the contents.
The lifespan of an open pack of coffee for an automatic machine is limited. It is optimal to use the grains within 3-4 weeks after opening the vacuum packaging. After this, an active oxidation process begins, and the taste of the drink becomes flat, even if the machine is working properly.
Features of customization for different Delonghi models
Different lines of coffee machines Delonghi have their own design features. For example, series Magnifica equipped with a classic brewing unit, which can be easily removed for washing. It is quite tolerant to the quality of grinding, but is sensitive to tamping.
More advanced models such as Dinamica or Primadonna, have a system LatteCrema and more complex water supply paths. They require more consistent grain quality, as automatic programs are set to specific extraction time intervals. Using non-standard coffee can confuse the algorithms.
☑️ Checking the machine’s readiness for new coffee
If you are switching from one type of coffee to another (for example, from dark roast to light), be sure to carry out the adaptation procedure. First, do several grinding cycles without brewing to clear the channels of the old fraction. Then gradually adjust the grinding regulator, assessing the flow rate.
For horn models (series EC) the requirements are even stricter. Here you will need a separate coffee grinder. The quality of the knives and the grinding stability of the external coffee grinder influence the result more than the coffee machine itself. In this case grind uniformity is the only critical success factor, since manual tempering is difficult to correct preparation errors.
Typical mistakes and their impact on technology
Many users ignore basic operating rules, relying on smart electronics. However, no automation will save the machine from the consequences of using unsuitable raw materials. The most common mistake is ignoring cleaning after changing the type of coffee.
Remaining oils from previous coffee oxidize and go rancid. When brewing a new portion, hot water washes away this residue, giving the fresh drink an unpleasant taste of old fat. Regularly washing the brewing unit under warm water (without detergents!) should become a habit.
Another mistake is using tap water without filtration. Scale formed in the thermoblock reduces heating efficiency and changes steam pressure. Combined with unsuitable coffee, this results in double the load on the system. Always use filtered or bottled water with low mineral content.
- 💧 Hard water + bad coffee = accelerated wear of the thermoblock and pump.
- 🧼 Do not use chemical cleaning tablets more than once a month, unless the manufacturer indicates otherwise.
- 🔄 Change the filter in the water tank every 2 months or 50 liters to soften the water.
Can Delonghi use coffee beans with additives (vanilla, chocolate)?
Strongly not recommended. The flavorings in such grains are a chemical film or sugar glaze. When heated and ground, they turn into a sticky substance that tightly glues the grinders of the coffee grinder. It is almost impossible to clean them without complete disassembly and ultrasound. If you want vanilla-flavored coffee, buy a quality syrup and add it to your cup.
Why does the coffee machine hum but no coffee comes out?
Most likely the grind is set too fine for the current humidity and grain type. The coffee dust is compacted into a monolith, and the pump cannot push water through it. Try increasing the grind fraction (turn the dial towards larger numbers or counterclockwise) by one notch while the coffee grinder is running.
How often do you need to change the grain in the bin?
You shouldn’t fill a full bunker “a month in advance.” Coffee in an open hopper will quickly dry out. It is better to add fresh grains when about 20-30% of the volume remains in the container. This way you will ensure constant freshness of the drink and minimize contact of the beans with air.
Does the country of origin affect the operation of the coffee machine?
Indirectly. Brazilian and Colombian beans (the basis of most blends) have a standard density, ideal for Delonghi. Beans from Ethiopia or Yemen may be denser or, conversely, loose, which will require finer grinding settings. The main thing is not the country, but the quality of roasting and freshness.
If you notice that the coffee begins to flow out faster than usual, do not rush to turn the regulator. First, check if the beans in the hopper are empty - sometimes the auger starts blowing air if the coffee level is critically low.
Regular maintenance and the correct selection of beans increase the service life of the Delonghi coffee machine by 2-3 times, maintaining the quality of the drink at the same level as the first day of use.