How to Descale the Jura C5 Coffee Machine

If your Jura C5 espresso machine stops brewing as strongly or starts making strange noises, it might not be broken — just overdue for descaling. Like all high-end automatic machines, the C5 uses internal tubing and pumps to heat and push water through coffee grounds. Over time, mineral deposits build up inside and impair performance, taste, and machine life.

The simple answer: When the descale and service indicator lights come on, follow the 10-step Jura C5 descaling process using three cleaning tablets dissolved in 500 ml of water. This clears mineral buildup and resets your machine for optimal brewing.

Why Your Jura C5 Needs Descaling

All automatic espresso machines, including the Jura C5, heat water to brew espresso and steam milk. This repeated heating causes calcium and magnesium — common minerals in tap water — to accumulate inside the boiler, pipes, and pump. Over time, this scale restricts water flow, reduces heating efficiency, and can degrade the taste of your espresso. The C5 notifies you with blinking indicator lights when it’s time to remove that buildup through descaling.

What You’ll Need for Jura C5 Descaling

To properly descale your Jura C5, gather:

• Three Jura descaling cleaning tablets
• 500 milliliters of fresh, clean water
• A container to catch draining water from the steam wand and milk frother
• A clean sponge or cloth for wiping

No special tools are required, though having a towel handy helps with spills.

Step-by-Step: How to Descale the Jura C5 Coffee Machine

1. Start the Descaling Mode

When the maintenance and descaling indicator lights turn on, press and hold the descaling button until both the descaling indicator light and the used coffee grounds (puck) bin indicator light begin flashing. This confirms you’ve activated the descaling program.

2. Prepare the Machine Internals

Empty the drip tray (waste water tray) and the used coffee puck container. Put them back in place. Once the water tank indicator lights up, remove the water tank and completely empty it.

3. Prepare the Descaling Solution

Dissolve three Jura descaling cleaning tablets fully into 500 milliliters of fresh water. Pour this solution into the water tank, then reinsert the tank into the machine. Remove the steam wand’s milk frother (also called the milk foam nozzle or frothing aid) before proceeding.

4. First Drain Cycle — Steam Wand Flush

Place a container under the steam wand’s milk frother nozzle. Turn both the hot water and steam knobs counterclockwise. Water will flow from the milk frother nozzle. Once water stops and the steam knob indicator lights blink, you’re ready for the next step.

5. Begin the First Descaling Cycle

Turn the hot water and steam knobs clockwise. The machine will start pumping the descaling solution through its internal system, including the steam wand. After a few minutes, the puck bin indicator light will flash, signaling progress.

6. Empty Containers & Reset

Discard the liquid collected under the milk frother. Empty the drip tray and the used coffee puck container again. When the water tank indicator light turns on, you're cleared to refill.

7. Refill and Rinse the Water Tank

Take out the water tank, rinse it thoroughly inside and out with fresh water, then refill it and place it back into the machine. Wait for the steam knob indicator to light up again.

8. Second Drain Cycle — Repeat Steam Wand Flush

Put a container back under the milk frother nozzle. Turn the hot water and steam knobs counterclockwise. Water will flow from the nozzle. Once the flow stops and the steam indicators blink, you’re set for the final descaling flush.

9. Complete the Second Descaling Cycle

Turn the hot water and steam knobs clockwise. The descaling solution will circulate again through the machine’s internals. After a few minutes, the puck bin indicator light will flash, indicating the cycle is working.

10. Final Rinse and Reset

Empty the container under the milk frother. Clean out the drip tray and puck bin once more. Reinstall the milk frother. The machine will indicate it's ready with a “rinse” or “ready” indicator light. Let it warm up. Your Jura C5 is now descaled and back in service.

Note: If the descaling process is interrupted at any point, thoroughly rinse the water tank before retrying or continuing.

Frequently Asked Questions

How often should I descale my Jura C5?

Jura does not specify an exact timeline, but most automatic espresso machines need descaling every 2–3 months with regular use, or when the descaling and service indicator lights illuminate.

What kind of water should I use to descale the Jura C5?

Use fresh, clean tap water to dissolve the three descaling tablets. Avoid distilled or previously boiled water unless specified — the tablets are formulated for normal tap water.

Can I use a different descaling solution in my Jura C5?

Jura recommends using only its own descaling tablets in the C5. Other solutions may damage the machine or void warranties. Always use the three-tablet, 500 ml solution as directed.

What if the descaling process is interrupted?

If descaling is stopped before completion, thoroughly clean and rinse the water tank. Then restart the descaling procedure from the beginning to ensure all scale is removed safely.

Do I need to rinse the machine after descaling?

Yes. The final steps of the Jura C5 descaling process include rinsing the water tank and running clean water through the system to remove any residual descaling chemicals.

Why do the indicator lights blink during descaling?

Blinking lights indicate which part of the descaling process is active — whether it's draining, flushing the steam wand, or circulating the descaling solution internally. They help guide you through each stage.

Recommended FrontStreet Coffee Beans for Home Espresso

For the best results from your Jura C5, try FrontStreet Coffee’s Classic Blend — a well-rounded espresso with notes of dark chocolate, nuts, and a silky crema. For brighter, fruitier shots, the Specialty Blend highlights citrus and floral tones, while the Black Cocoa Blend delivers deep cocoa, spice, and heavy body. All three are expertly roasted for espresso extraction and designed to highlight your machine’s full potential. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.