Refill Water Tank
Jura Coffee Machine
Severity:What Does This Error Mean?
Most cases are the obvious one: tank is empty, refill it.
If the tank is clearly full and the message still shows, the float inside the tank is stuck — gently shake the tank to free it.
If that doesn't work, the contacts on the bottom of the tank are dirty and need cleaning.
This message is one of the easiest to clear once you know about the float.
Affected Models
- Jura E8
- Jura ENA 8
- Jura S8
- Jura Z10
- Jura Giga 6
Common Causes
- Water tank actually empty (most common)
- Float inside the tank stuck — usually limescale
- Contacts on the tank bottom dirty or wet
- Tank not seated properly on the machine
- Tank-presence sensor on the machine itself failed (rare)
How to Fix It
-
Confirm the tank actually has water.
Lift the tank out and look — sometimes the level is lower than it appears.
Refill to the MAX line with fresh cold water.
Don't use distilled water — Jura machines need some mineral content for the heating system. -
Check the float.
Look at the bottom of the tank.
There's a small white float that rises with the water level.
If it's stuck at the bottom, gently shake the tank or tap it on a folded towel.
The float should move freely. -
Clean the contacts on the tank bottom.
Two small metal contacts under the tank tell the machine when the tank is in place.
Wipe them with a dry cloth.
If they're scaled or wet, dry them thoroughly — water bridging the contacts confuses the sensor. -
Clean the matching contacts on the machine.
Look at the spot on the machine where the tank sits.
You'll see two matching metal pins or pads.
Wipe them dry.
If you've had any water spillage, dry these thoroughly before replacing the tank. -
Reseat the tank firmly.
Push the tank down until it sits flat against the machine.
Gently rock it side-to-side to confirm it's seated.
The message should clear within a second or two.
Frequently Asked Questions
Why does the float get stuck?
Limescale builds up around the float over time, especially in hard-water areas.
The buildup makes the float stick to the rod it slides on.
Regular descaling using Jura's descaler (every 6–8 weeks for daily users) keeps the float free.
You can also remove the float and clean it directly — most Jura tanks let it lift off.
Can I use filtered water in my Jura?
Yes — but use Jura's CLARIS filter that fits inside the tank.
External filters work too but Jura's CLARIS filter is calibrated for these machines and triggers descaling reminders correctly.
Don't use distilled water — Jura machines need some minerals.