Lighted up indicator SCALE or flashing steam light on the control panel of the coffee machine DeLonghi signals a critical level of calcium deposits in the hydraulic system, which requires the immediate launch of a decalcification program. If you ignore this signal, scale will begin to block the passage of water through the boiler, which will lead to a drop in pressure, overheating of the heating element and, ultimately, to expensive repairs of the pump or heat exchanger. Videos of this procedure often demonstrate the process on specific models, such as Magnifica or Dinamica, but the basic algorithm of actions remains similar for most automatic devices of this brand.
The process of removing mineral deposits takes about 30 minutes and requires a special liquid product, since vinegar or citric acid can damage internal seals and plastic structural elements. During operation, the device will cyclically pump the solution through the brewing unit and steam wand, so it is important to prepare a container of sufficient volume, usually at least 1.5 liters, to collect the waste liquid. It is strictly forbidden to interrupt the cleaning cycle once it has started, since the remnants of the aggressive solution may remain in the system and spoil the taste of the next coffee prepared.
Visual control of the process is especially important if you are performing the procedure for the first time or if you have previously used folk remedies that could create additional deposits. Video instructions often focus on the moment the steam trap opens, when the device enters active flushing mode, and it is at this moment that the user must be attentive to the water level in the pan. Understanding the physics of the process helps you avoid common mistakes such as overfilling the pan or removing the water reservoir prematurely.
Diagnosis of cleaning needs and error codes
The need for maintenance can be determined not only by the lit indicator, but also by indirect signs of the device’s operation. Brewing unit starts to work with increased noise, and the preparation time for one serving of espresso increases noticeably due to the narrowing of the water supply channels. If the stream of steam from the cappuccino maker has become weak and intermittent, although it previously worked normally, this is a sure sign that salt deposits have blocked the outlet.
Many modern models DeLonghi equipped with a self-diagnosis system that displays alphanumeric codes or flashing lamp combinations. For example, the steam and cup lights flashing at the same time may indicate the need for urgent decalcification. In some cases, if the procedure was not carried out on time, the machine may block the ability to make coffee, requiring a mandatory cleaning cycle.
⚠️ Attention: If, after completing the full cleaning program, the scale indicator continues to light, the conductivity sensor may be dirty or damaged, and mechanical cleaning of the contacts or replacement of the assembly is required.
To accurately determine the status of the device, it is recommended to check the manual of your specific model, since the logic of the LEDs may differ. On older models of the series Magnifica ESAM The indication may be less informative than on new series with LCD displays, where the message text directly indicates the problem. Regularly checking the condition of your tank water can also help predict the rate at which sediment will form.
Preparing equipment and choosing a product
Before starting the procedure, you must purchase a specialized descaling agent recommended by the manufacturer, for example, EcoDecalk. The use of aggressive acids, such as hydrochloric acid or concentrated acetic acid, can lead to corrosion of the metal parts of the boiler and destruction of rubber gaskets, which will render the unit unusable. Liquid products based on lactic or sulfamic acid are gentler and more effective at dissolving carbonate deposits without damaging internal surfaces.
You will need a clean container with a volume of at least 1.5 liters to collect waste liquid, since the machine pumps a significant volume of water in one cycle. Also prepare a measuring cup, which usually comes with the coffee machine, or use the markings on the bottle itself to ensure correct mixing proportions. The water for preparing the solution should be cold and preferably filtered to avoid introducing additional impurities into the system.
- 🧴 Specialized liquid decalcification product (not powder).
- 💧 Clean water with a volume of about 1.5–2 liters.
- 🥣 Container for draining waste liquid (minimum 1.5 l).
- 🧽 Soft cloth for wiping external surfaces and tray.
It is important to remove all removable parts, such as the drip tray and water tank, in advance so that you can easily access them while working. Rinse the tray with clean water to remove any remaining coffee grounds that may mix with the cleaning solution and create a stubborn mess. Make sure the brewing unit is installed correctly and the service door is closed before starting the program.
Use only original products or their high-quality analogues with neutral pH to maintain the warranty on the device and extend the life of the pump.
Step-by-step algorithm for launching the cleaning program
The process of launching the program may vary slightly depending on the model, but the general principle remains the same for the entire line DeLonghi. First you need to go into setup mode, often done by long pressing the steam button or a key combination, after which the indicator will light up, inviting you to add the product. Pour the required amount of liquid (usually 100 ml) into the empty water tank, and then add cold water to the mark A or maximum risk.
Place the tank in place, place a container under the steam and hot water spout, as well as under the coffee spout, since rinsing occurs through both circuits. Press the program start button, after which the machine will begin to suck in the solution and pulse it through the system. At this moment, you must not open the service door or remove the brewing unit, as pressure will build up inside and the hot solution may burn you.
☑️ Checklist for preparing for cleaning
During the cycle, the machine may pause to soak the internal channels; at these moments the pump does not hum, but the process is not completed. Monitor the liquid level in the collection container so that it does not overflow, as the volume of waste may be greater than the volume of the solution poured due to the addition of rinse water. Once the main cycle is complete, the machine will automatically enter the clean water rinse phase, which requires you to empty and refill the tank again.
Table: Comparison of descaling products
Selecting the correct chemical composition plays a key role in cleaning efficiency and device safety. Below is a comparison of popular types of products used to maintain coffee machines DeLonghi.
| Product type | Base | Safety for parts | Efficiency |
|---|---|---|---|
| Original EcoDecalk | Lactic acid | High (developed for the brand) | Optimal |
| Universal liquid analogues | Sulfamic acid | Medium (require precise dosage) | High |
| Tablets for coffee machines | Acid complex | Medium (may not dissolve completely) | Average |
| Acetic acid (folk) | Vinegar | Low (corrodes rubber and plastic) | High but risky |
Using tablets can be inconvenient in automatic machines as they take time to dissolve completely and undissolved particles can end up in the pump. Liquid products begin to work instantly after mixing with water, ensuring uniform cleaning of all areas of the hydraulic system. When choosing analogues, be sure to check for the presence of markings indicating compatibility with automatic coffee machines.
Why can't you use citric acid?
Powdered citric acid is poorly soluble in cold water and can crystallize in the narrow channels of the boiler, creating plugs. In addition, it is less effective against complex calcium salts formed at high temperatures than specialized compounds based on organic acids.
Completing the cycle and final rinsing
After the machine has pumped all the limescale solution, it will signal the need to replace the water in the tank with clean water. This step is critical because any residual cleaning product can give your coffee an unpleasant chemical taste and odor. Fill with fresh water to the maximum and start the process again, the machine will automatically run water through the system to remove any remaining chemicals.
In some models, the washing procedure is repeated twice for a guaranteed result. Watch the indicator on the panel: when the process is completed successfully, the indicator SCALE will go out and the machine will go into ready mode. If the light comes back on immediately after cleaning, there may be concentrated chemicals left in the reservoir or the sensor may require calibration.
- 🚿Rinse the water tank with clean water before the final step.
- ☕ Brew 1-2 cups of coffee and pour them out to clean the brewing unit.
- 🧼 Wipe the outer surfaces and steam wand with a damp cloth.
Be sure to rinse the brewing unit under running water without detergents after completing all program cycles. This will remove coffee oils and any remaining scale that may have washed out of the hydraulic system and settled on the unit's strainers. Regular maintenance of the brewing mechanism combined with decalcification ensures stable drink quality.
⚠️ Attention: Never use the coffee machine to prepare a drink immediately after finishing the cleaning cycle without first rinsing the system with clean water and preparing test portions.
Typical errors and troubleshooting
One of the most common mistakes is interruption of the cleaning process due to accidental shutdown of the device or lack of water in the tank. If a cycle is interrupted, the machine may not complete the program or reset the scale counter, requiring the procedure to be repeated from the beginning. In some cases, it is necessary to reset the settings to factory settings or manually reboot the device by disconnecting it from the network for 15-20 minutes.
Another problem is the use of a solution that is too concentrated, which leads to excessive foaming and possible overflow of liquid over the edge of the pan or even from under the housing. If foam gets inside the mechanism, it is necessary to allow the device to dry for 24 hours before turning it on again to avoid a short circuit. Always strictly follow the proportions indicated on the product bottle.
The main rule for successful cleaning is not to interrupt the process and use only special liquid products that are safe for food contacts and materials of the coffee machine.
If after all attempts the machine continues to signal scale, the problem may lie in the electronic module or the water hardness sensor itself. In such cases, it is recommended to contact an authorized service center for diagnostics, since opening the case yourself may lead to loss of warranty. Regular use of water filters will help extend the intervals between cleanings.
What to do if the coffee machine does not see the cleaning agent?
Make sure you add the product to the empty reservoir before adding water, as some models require. If a conductivity sensor is used, it may be dirty; Try gently wiping the contacts in the reservoir with a soft cloth. Also check whether the product has expired, as some components may have precipitated.
Can I use distilled water to avoid scale?
The use of fully distilled water is not recommended by manufacturers, since flow and hardness sensors operate based on the electrical conductivity of the water. The distillate does not conduct current and the machine may generate errors or not operate correctly. It is better to use filtered tap water or bottled water of medium mineralization.
How often should I descale?
The frequency depends on the water hardness and intensity of use. On average, with average water hardness and preparing 3-5 cups per day, the procedure is carried out once every 2-3 months. If you have installed a filter softener, the interval increases to 50 liters of brewed coffee or 2-3 months, whichever comes first.