How to Descale a Krups Coffee Machine

Know Your Krups Machine Type First

Krups makes two quite different kinds of coffee machine, and they descale differently:

• Fully automatic and superautomatic machines (Krups’ EA-series and Evidence lines, for example) have a built-in CALC warning light and a dedicated descaling program you start from the machine’s settings.
• Basic drip coffee makers don’t have a CALC light or a programmed descaling cycle - they need a manual vinegar-or-descaler-and-water cycle, similar to most other reservoir-based coffee makers.

If your machine has a gearwheel/settings button and a CALC indicator, follow the automatic-machine steps below. If it’s a simple drip machine with a carafe and no such indicator, skip to the basic drip section.

How to Descale a Krups Automatic or Superautomatic Machine

Wait until the CALC warning light turns on before descaling - running the program too early wastes a sachet of descaler for no benefit, and running it too late lets scale accumulate further.

Preparation:

1. Empty and clean the drip tray, then put it back in place.
2. Remove the water tank and take out the water filter cartridge, if your machine uses one.
3. Fill the tank with fresh water up to the CALC fill mark.
4. Add one sachet of Krups descaling powder, or the equivalent amount of Krups liquid descaler, and mix it in.
5. Place a container that holds at least 600ml under both the coffee outlet and the steam nozzle - the program dispenses through both.

Running the program:

1. Press the settings button (the gearwheel or CALC indicator icon) to enter descaling mode.
2. The first cleaning phase runs for about 8 minutes.
3. When the machine pauses and beeps, empty the 600ml container and place it back under the nozzle.
4. Empty, rinse, and refill the water tank with clean tap water (no descaler this time), then reinsert it.
5. Press the button again to start the rinsing phase, which runs for about 6 minutes and clears out any remaining descaler.
6. Empty the container and drip tray one final time once the program finishes.

How to Descale a Basic Krups Drip Coffee Maker

Without a CALC light or built-in program, the process is manual:

1. Fill the reservoir with a mixture of white vinegar and water (roughly 1:2 to 1:3 is a common starting ratio), or a citric-acid-based descaling solution mixed per its instructions.
2. Run a normal brew cycle with no coffee in the basket, letting the solution pass through the machine.
3. If buildup is heavy, let the solution sit in the reservoir for 15-30 minutes partway through, or repeat the cycle with a fresh batch.
4. Once finished, run one or two full cycles of plain water through the machine to rinse out any remaining vinegar or descaler taste.

Vinegar vs. Krups Descaling Solution

For Krups’ automatic and superautomatic machines, Krups’ own descaling powder or liquid is the recommended choice, and for good reason: these machines have sealed internal tubing that’s harder to flush completely, and lingering vinegar odor or taste can be difficult to fully rinse out. Krups designs the internal descaling program around its own descaler’s concentration and dwell time, so substituting vinegar can also mean the program’s timing doesn’t match what the solution actually needs to dissolve scale effectively.

For a basic drip Krups machine, vinegar is a perfectly reasonable, cheaper substitute, similar to most other reservoir-based coffee makers - see our full maintenance and descaling guide for more on when vinegar is and isn’t the better choice.

How Often to Descale a Krups Machine

For automatic and superautomatic models, let the CALC light be your guide rather than a fixed calendar - it’s based on brew cycles and water hardness (see our hard water and coffee guide for why that varies so much by location). As a general reference point, that typically works out to roughly every 1-3 months depending on how hard your water is and how often you use the machine. For basic drip Krups machines without an indicator, aim for every 3 months on soft water and monthly on hard water. See our maintenance and descaling guide for the broader reasoning behind these intervals.

Troubleshooting After Descaling

If the CALC light stays on after a completed descaling program, double-check that the water tank was properly reseated and that the full rinse phase ran to completion - an interrupted cycle is the most common reason the light doesn’t clear. If the machine won’t enter descaling mode at all, confirm you’re pressing the correct settings/gearwheel button for your specific model, since the exact button layout varies across Krups’ automatic line.

For issues that turn out to be unrelated to descaling entirely - weak flow, strange noises, a machine that won’t power on - see our guide to common coffee maker problems.

FAQs

How do I descale my Krups coffee machine? On automatic and superautomatic models, wait for the CALC light, prepare the machine (empty drip tray, remove the filter, fill to the CALC mark, add descaling powder or liquid), then run the built-in program through both its cleaning and rinsing phases. On basic drip Krups machines, run a vinegar-water or descaler-water solution through a normal brew cycle, then flush with plain water.

Can I clean my Krups coffee maker with vinegar? On basic drip machines, yes. On automatic and superautomatic machines, Krups’ own descaling powder or liquid is generally recommended instead, since vinegar can be harder to rinse fully out of the sealed internal tubing and the built-in program is calibrated around Krups’ own descaler.

How do I enter descaling mode? Press the settings button - typically a gearwheel icon or the CALC indicator itself - once the CALC warning light is on. The exact button location varies by model, so check your machine’s manual if you don’t see it right away.

Is descaling solution better than vinegar? For Krups’ automatic and superautomatic machines, yes - the built-in descaling program is designed around the manufacturer’s own descaler, and it rinses out more completely than vinegar from sealed internal components. For basic drip machines, vinegar works fine as a cheaper alternative.