Jura Professional Coffee Machine Message: Fill Water Tank
The Jura Professional display shows Fill water tank when the water tank is empty, and no products can be prepared. Fill the water tank and the machine continues.
Low: an operator prompt that clears as soon as the tank is filled.
- Code
- Fill water tank
- Maker
- Jura Professional
- Equipment
- Super-automatic coffee
- Applies to
- GIGA X8 (NAA), JURA Type 748; WE8, JURA Type 737
What does Jura Professional Fill water tank mean?
Before it makes anything, the machine checks the water level in its tank. When the tank is empty, it cannot brew coffee, hot water or steam, so it blocks product preparation and shows Fill water tank. The manual lists this under display messages with a single action: fill the water tank. This is an operator prompt, not a malfunction. Once the tank is refilled and seated, the message goes away and products can be selected again. On a busy bar it is the most common prompt of the day, since the tank empties with use. If the message stays after filling, the tank may not be seated fully, or the float that reports the level may be stuck. The manual covers both the GIGA X8 and the WE8 with this wording.
Affected models and control systems
JURA GIGA X8 (NAA), JURA Type 748, and JURA WE8, JURA Type 737. Display wording is taken from the GIGA X8 and WE8 instructions for use.
Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.
What you may notice
- Fill water tank on the display
- No coffee or hot water can be selected
- Machine idle even though it is switched on
- Message remains after filling
Possible causes
Likely causes — what usually sits behind Fill water tank on this control. A technician confirms which one it is before any part is replaced.
- Water tank is empty
- Tank not seated fully on its connector after refilling
- Level float in the tank stuck or fouled with scale
- Tank filled while the machine was between steps so the message lingers briefly
Safe checks before calling for service
- Remove the tank, fill it with fresh water and refit it firmly.
- Wait a few seconds for the display to update.
- Check that the tank is seated and the lid is closed.
- Try a product, such as hot water.
- If the message returns right after filling, note it for the service call.
How a technician diagnoses Fill water tank
- Read the display and confirm Fill water tank is the active message.
- Check the tank seating and the tank connection.
- Inspect the level float for scale or sticking.
- Check the water level sensing and its wiring.
- Verify the machine accepts a product after the fix.
- The level sensing is wired into the machine's control inside the housing.
- Descaling the float chamber may require opening the unit.
- Telling a sensor failure from a seating problem needs a meter.
How Fill water tank differs from similar codes
This message appears on both models. The GIGA X8 and WE8 word it the same way.
Technical reference
- Maker documentation
- Jura Professional owner support
- Edition
- No revision printed (120 V US model)
- Models / control
- GIGA X8 (NAA), JURA Type 748; WE8, JURA Type 737
- Section
- Chapter 6 Display messages (printed pp. 46-47)
- Checked
- October 2026
We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.
Related Jura Professional super-automatic coffee error codes
Can I make hot water?
No. The manual says no products can be prepared while the tank is empty.
Does the message clear by itself?
Yes, once the tank is refilled and seated.
I filled it and the message stays.
Check the seating and the float. If it persists, call.
Need help with Jura Professional Fill water tank?
A technician confirms the cause on site and gives you the price in writing before any work starts.