JURA C3 (2026) Owner’s Manual Guide

A practical, “actually-useful” guide to set up, dial in, maintain, and troubleshoot your C3—written like a premium ownership handbook (not a sleepy pamphlet). For safety and warranty details, always keep the official instructions close by.

1) What the C3 is (and what it’s built to do)

The C3 is a streamlined bean-to-cup machine focused on black coffee beverages—fast espresso and coffee with simple controls, consistent extraction, and easy maintenance routines. It supports classic coffee prep (plus ground-coffee “powder” mode), optional app connectivity, and guided maintenance programs (filter, cleaning, descaling).

Key capacity & hardware (quick reference)

• Water tank: 1.6 L (without filter)
  
• Bean container: 200 g
  
• Grounds container: up to 16 portions
  
• Pump pressure: max. 15 bar (static)
  
• Dimensions (W×H×D): 26.0 × 32.5 × 43.7 cm
  
• Weight: ~9.4 kg
  
• Notes: Some details can vary by region/version; always follow your unit’s rating plate and included docs.
  

2) Safety + placement (the rules that prevent regret)

Placement rules

• Put the machine on a level surface that isn’t sensitive to water.
  
• Don’t cover ventilation slots; protect against overheating.
  

Water + beans rules

• Only fill with fresh, cold, non-carbonated water (no sparkling water).
  
• Do not use beans treated with additives (including caramelized/sugared beans)—they can damage the grinder.
  

Remote/app operation warning (important)

If using optional mobile control, be sure nobody can be harmed by hot spouts or running programs when you start a drink/maintenance cycle.

Cleaning agent warning

Use only recommended/original maintenance products—wrong agents can damage the machine or leave residues.

3) First-time setup (10-minute “do it right” walkthrough)

Step A — Fill beans

1. Remove the aroma preservation cover.
   
2. Fill with roasted, untreated beans.
   
3. Close the aroma preservation cover.
   

Step B — Determine your water hardness (don’t skip)

1. Hold the included Aquadur® test strip under running water for 1 second.
   
2. Shake off water and wait ~1 minute.
   
3. Read hardness from the strip color vs the packaging guide.
   

Step C — Power on and initial settings

1. Plug in and press the power button.
   
2. Choose language.
   
3. Set water hardness in the prompt.
   

Step D — Install the filter (recommended)

1. Rinse the tank with cold water.
   
2. Attach the included extension to a CLARIS Smart+ filter.
   
3. Insert filter + extension into the water tank, turn clockwise until it clicks.
   
4. Fill tank with fresh, cold water; insert tank.
   
5. The machine detects the filter and performs rinsing prompts (including emptying the tray).
   

Ownership win: If you consistently use the CLARIS Smart+ filter, the machine does not need descaling.

4) Controls & daily use (how to brew like you mean it)

The two “always-works” shortcuts

• Change coffee strength for a single drink: press 9 or 0 during grinding.
  
• Change drink volume for a single drink: press 9 or 0 during brewing.
  

Make two drinks / “double”

Press the same drink button twice within two seconds.

Switching on/off behavior

• On power-up: the machine rinses.
  
• On power-off: it only rinses if a coffee beverage was prepared.
  

Water habits that keep flavor clean

Change the water daily. This is a bigger deal than people think—stale tank water = stale tasting coffee.

5) Dialing in flavor (the “barista brain” section)

A) Grinder setting (do this correctly)

Critical rule: Only adjust grind while the grinder is running, otherwise you can damage the adjustment mechanism.

How to adjust during an espresso:

1. Put cup under spout.
   
2. Open cover.
   
3. Start espresso.
   
4. Turn grinder adjustment switch while grinder runs.
   
5. Close cover.
   

How you’ll know you nailed it:

• Coffee flows steadily (not drippy, not blasting watery).
  
• Crema is fine and thick.
  

B) Permanent drink settings (AROMA / strength, etc.)

To permanently change a drink:

1. Press and hold the drink button ~2 seconds.
   
2. Navigate to AROMA (and other available items) and adjust.
   
3. Save and return to start screen.
   

6) Ground coffee “Powder Mode” (decaf nights, specialty beans, testing)

The C3 can brew using ground coffee by activating POWDER in the menu (this adds ground-coffee beverages to your options).

Best-practice rules to avoid clogs and weak cups:

• Use very fine ground coffee, but not “dust-fine.”
  
• Never add more than 2 level measuring spoons of ground coffee.
  
• Add the grounds, then start brewing within about 1 minute—don’t let it sit.
  

7) App connectivity (optional, but slick)

If you have the optional Wi-Fi Connect inserted:

1. Make sure the J.O.E.® app is installed and you’re logged into your home network.
   
2. Insert Wi-Fi Connect in the service socket; switch C3 off then on.
   
3. Go to MENU → APP → confirm to connect.
   

8) Ownership excellence: your maintenance system (easy, consistent, clean)

Your “never fail” daily routine

• Empty drip tray + grounds container; rinse with warm water.
  
• IMPORTANT: Empty grounds while the machine is switched on (that’s how the counter resets).
  
• Rinse the water tank and refill with fresh cold water.
  
• Wipe the machine with a soft damp cloth (microfiber is ideal).
  
• Clean cup grille top/bottom as needed.
  

How the machine tells you maintenance is due

If maintenance is required (filter/clean/descale), the indicator dots on page 2 of the start screen turn red. Use the menu to run the needed program.

9) Maintenance programs (step-by-step, no guessing)

A) Filter change (CLARIS Smart+)

• Benefit: When using the CLARIS Smart+ filter, descaling is not required.
  

Steps:

1. Remove and empty water tank.
   
2. Turn filter anticlockwise; remove filter + extension.
   
3. Fit extension on new filter.
   
4. Insert, turn clockwise until it clicks.
   
5. Fill tank, reinsert.
   
6. Machine detects change and performs rinsing into drip tray; then empty tray/grounds.
   

B) Cleaning program (brew system clean)

The C3 prompts cleaning after 180 preparations or 80 switch-on rinses.

Rules that matter:

• Cleaning takes ~20 minutes.
  
• Don’t interrupt it—cleaning quality suffers.
  

Steps:

1. Fill water tank.
   
2. Go to MENU → CLEANING → confirm.
   
3. Empty grounds + drip tray.
   
4. Place a receptacle under spout.
   
5. When prompted “INSERT TABLET”: open powder chute cover, insert a JURA cleaning tablet, close cover.
   
6. Continue; water flows several times; empty grounds/tray again when prompted.
   

C) Descaling program (only if not using CLARIS Smart+)

• If using CLARIS Smart+ filter, you will not be prompted to descale.
  
• Descaling takes ~20 minutes and should not be interrupted.
  

High-level steps (follow on-screen prompts):

1. MENU → DESCALING → confirm.
   
2. Dissolve 3 JURA descaling tablets in 500 ml water, then fill tank with solution.
   
3. Run the program: it will prompt for emptying grounds/tray, then flushing/rinsing cycles.
   
4. After solution phase, rinse tank thoroughly, refill with fresh water, and continue until finished.
   

D) Descale the water tank (separate from machine descaling)

1. Remove tank (remove filter first if installed).
   
2. Fill tank and dissolve 3 descaling tablets in it.
   
3. Leave for several hours (overnight is fine).
   
4. Empty and rinse thoroughly; reinstall filter; refill with fresh water.
   

E) Clean the bean container (underrated flavor fix)

Oil film from beans can build up and affect taste—clean occasionally:

1. When “FILL BEANS” shows, switch off.
   
2. Remove aroma cover.
   
3. Wipe the bean container with a soft, dry cloth.
   
4. Refill beans and close cover.
   

10) Transport / moving / storage

To prevent frost damage during transport, empty the system:

1. Place receptacle under coffee spout.
   
2. MENU → EMPTY SYSTEM → confirm.
   
3. Remove/empty water tank when prompted; continue.
   
4. Water will flow until system is empty; machine switches off.
   

11) Excellent ownership bullet points (the “keep it perfect” checklist)

• Use clean, fresh water daily; it’s the simplest upgrade to taste.
  
• Avoid flavored/sugared/caramelized beans—protect the grinder and keep your internals clean.
  
• Adjust grind only while grinding—this prevents damage.
  
• If coffee drips slowly: grind is too fine; go coarser.
  
• Always empty grounds while the machine is ON (so the counter resets).
  
• Run cleaning and descaling cycles when prompted—don’t postpone; the machine is tracking usage for a reason.
  
• If using CLARIS Smart+, you typically won’t need descaling—just keep up with filter changes.
  
• Keep a slim “maintenance kit” at home: filters, cleaning tablets, descaling tablets (if no filter), microfiber cloth.
  
• Set an auto switch-off time that matches your lifestyle—fast convenience vs energy saving is your call.
  
• If you use the app, treat remote brewing like turning on a stove: make sure nobody can be harmed by hot spouts or cycles.
  

12) FAQ (real questions, real answers)

Setup & basics

Q: What water should I use?

Fresh, cold, non-carbonated water only. Don’t use sparkling water or other liquids.

Q: Do I really need to test water hardness?

Yes—water hardness affects limescale buildup, and the C3 asks you to set it at first use.

Q: Can I use flavored or sugar-coated beans?

No—beans with additives/caramelization can damage the grinder.

Q: Why does it rinse when I turn it on?

That’s normal. It’s part of start-up hygiene and temperature stability.

Q: Why doesn’t it rinse every time I turn it off?

It only rinses on shutdown if a coffee beverage was prepared.

Brewing & taste

Q: How do I make a “double” (two coffees / two espressos)?

Press the drink button twice within two seconds.

Q: How do I temporarily change strength without reprogramming?

Press 9 or 0 during grinding to change coffee strength for that single drink.

Q: How do I temporarily change volume for one drink?

Press 9 or 0 during brewing to change the amount for that single drink.

Q: My espresso is dripping slowly. What’s the fix?

Your grind is likely too fine—set grinder coarser.

Q: When I change grind, when should I do it?

Only while the grinder is running.

Q: How do I permanently increase strength (AROMA) for coffee?

Hold the coffee button ~2 seconds, go to AROMA, adjust with 9/0, save.

Ground coffee mode

Q: Can I use decaf ground coffee sometimes?

Yes—activate POWDER in the menu and use the powder chute for ground coffee drinks.

Q: How much ground coffee can I add?

Max 2 level measuring spoons.

Q: What if I forget to brew after adding ground coffee?

The guidance is to brew within ~1 minute; otherwise the result can be compromised.

Maintenance & cleaning

Q: How often does it ask for cleaning?

After 180 preparations or 80 switch-on rinses.

Q: How long does the cleaning cycle take?

About 20 minutes.

Q: Can I stop the cleaning cycle once it starts?

You shouldn’t—interrupting reduces cleaning effectiveness.

Q: Do I have to descale if I use the CLARIS Smart+ filter?

No—when using CLARIS Smart+, the machine no longer needs descaling (and generally won’t prompt it).

Q: What’s the descaling mixture?

3 JURA descaling tablets dissolved in 500 ml of water (for the descaling solution step).

Q: Why does it say to clean the bean container sometimes?

Beans leave an oil film that can affect taste—wipe the container with a soft, dry cloth occasionally.

Messages & troubleshooting

Q: “FILL WATER TANK” — what now?

Fill the tank with fresh water.

Q: “EMPTY GROUNDS” — what now?

Empty grounds container and drip tray; reinstall.

Q: “TRAY MISSING” — what now?

Insert the drip tray correctly.

Q: “FILL BEANS” — what now?

Fill the bean container.

Q: Grinder suddenly got very loud. What does that mean?

Possible foreign object—contact customer support.

Q: I see ERROR 2 or ERROR 5.

If the machine has been exposed to cold, warm it to room temperature.

Travel / storage

Q: I’m moving—how do I prevent frost damage?

Run MENU → EMPTY SYSTEM and follow prompts to empty water and purge the system.