De'Longhi EXAM440.55 how to descale the Rivelia
When the machine shows "It’s time to descale the machine" or the descale symbol is lit. Takes about 30 minutes. Start from the message with Yes, or from Descale in the settings menu.
You need
- De'Longhi descaler, 100 ml
- Container of at least 1.5 litres
Steps
- Open the settings menu, choose Descale and press Read more (or press Yes on the alarm and continue from step 3).
- Press Yes and attach the hot water spout from the accessories compartment.
- Empty and refit the drip tray and grounds container, then press Next.
- Remove the water tank and take out the water softener filter if fitted. Press Next.
- Empty the tank, pour in De'Longhi descaler to level A (100 ml, one pack), add 1 litre of water to level B, refit the tank and press Start.
Danger of scalding! Hot water flows out of the spouts. Accordingly, take care to avoid contact with this solution.
Signal word assigned by Model Handbook Source: Descaling, p. 48
- Place an empty container of at least 1.5 litres under the coffee and hot water spouts and press Done. The descaling step and its rinses run automatically.
- When asked, empty the container, rinse the tank, fill it with fresh water to MAX, refit it and press Next.
- Put the empty container back and press Yes to start the first rinse. Empty the container when the tank runs dry.
- Refit the filter if you removed it, fill the tank to MAX again and press Next.
- Put the empty container back and press Yes for the second rinse. Then empty the container, the drip tray and the grounds container.
- Fill the tank to MAX, refit it, press Next and then Ok. The machine preheats and returns to the homepage.
Use only De'Longhi descaler; others, or skipping descaling when asked, can cause faults the guarantee does not cover. Wipe up spilled descaler at once, as it can damage delicate surfaces. If the tank was not filled to MAX for the rinses, the machine asks for a third rinse; empty the drip tray first. After a power cut the machine resumes descaling where it stopped.
Source: Descaling Source: Descaling, pp. 47–49
Used for
- It's time to descale the machine. Ready? (~30 min): The machine needs descaling. Press Yes to start, or Cancel to postpone; the descale symbol then stays lit on the homepage and the message returns at each switch-on.
- Oops, the process has been interrupted: Descaling was interrupted or not completed correctly.
- Descale warning indicator: Reminder that the machine must be descaled.
- Coffee is not hot
Other EXAM440.55 procedures
- How to install or replace the water filterWhen "It’s time to replace the water filter" appears or the filter symbol is lit, every 2 months, or after 3 weeks unused with a filter fitted.
- How to set the water hardnessAt first use and whenever your water supply changes. A correct setting means descaling is requested less often.
- How to clean the brewing unitAt least once a month, and when "Can you insert the brewing unit?" appears.
- How to clean the milk carafe after useAfter each milk drink, when the machine prompts for the Clean function. For several drinks in a row, press Cancel at the prompt and clean after the last one.
- How to clean the milk carafe thoroughlyAfter 1 day for the LatteCrema Cool carafe and after 2 days for the LatteCrema Hot carafe; the machine reminds you.
Sources
- Instructions for use, Rivelia EXAM44X.5Y (English). De'Longhi Appliances S.r.l. Document 57132C8962, revision 03, 2026-05, 65 pages, en. library.delonghigroup.com. Listed on the manufacturer's support page. Retrieved 13 November 2026.
- Instructions for use, Coffee maker EXAM44X5Y, 120 V edition (English, French, Spanish). De'Longhi Appliances S.r.l. Document 57132C9620, revision 02 (file A1-57132C9620_02_0426), 2026-04, 86 pages, en-US. library.delonghigroup.com. Retrieved 13 November 2026.
Page numbers are the numbers printed in the manual. Where this page and the manual differ, follow the manual.