How do I set the descaling frequency on the DELONGHI LA SPECIALISTA EC9155 coffee machine?

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The hardness of the water determines the descaling frequency. The harder the water in your area, the more often the machine will ask you to descale. By correctly setting this parameter, you optimize the descaling alerts based on your local water, which can reduce unnecessary descalings.

Step 1: Determine the hardness of your water The DELONGHI LA SPECIALISTA EC9155 machine comes with a hardness test strip (tablet C5). Immerse this strip completely in a glass of water for about one second, then remove it and shake it lightly. Wait for the color change to read the result: Level 1 = soft water, Level 2 = medium water, Level 3 = hard or very hard water.

Step 2: Access the settings menu Press and hold both control buttons on the front panel (OK button B6 and the selector button) simultaneously for 3 seconds. The settings menu will appear on the screen. Note that the menu will automatically close after 30 seconds of inactivity.

Step 3: Select the water hardness Use the dial (B8) or buttons to navigate to the “Water hardness” option. Press the OK button or a key to confirm this selection. The light corresponding to your current setting will illuminate.

Step 4: Choose your hardness level Use the dial to scroll through the four options: soft water, medium water, hard water, very hard water. Select the option that corresponds to the result obtained with the test strip. Press the OK button to confirm your selection.

Step 5: Save the changes Press the OK button (B6) to save the new hardness setting. The OK light confirms the recording, and you exit the settings menu.

Practical result: Once the hardness is set, the machine will automatically adjust the frequency of descaling alerts. With very hard water, you may be alerted every 2 to 3 months, while with soft water, alerts will be less frequent. To prolong the life of your machine, it is recommended to descale as soon as the “descale” light comes on, although you can also start the process at any time.

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