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Fill water tank

'Fill water tank' displayed — Water tank float trapped

Jura · J-Series Coffee Machines

What does Fill water tank mean?

The machine displays 'Fill water tank' even when the water tank is full. This indicates that the internal float mechanism in the water tank may be stuck.

Common Causes

  • Water tank float is trapped
  • Limescale build-up preventing float movement

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the water tank is properly seated in the machine.

  2. 2

    Remove the water tank, empty it, and then refill and reinsert it.

  3. 3

    Descale the water tank according to the machine's maintenance instructions (see Chapter 5 'Maintenance – Descaling the water tank').

Browse all codes in this manual (5)
Verified technical data. Last updated: April 2026

Related Faults

ERROR 2'ERROR 2' displayed — Machine too coldLittle/no frother outputLittle or no water/steam from cappuccino frother — Blocked connectorLoud grinder noiseGrinder making a very loud noise — Foreign object detected
Source: Jura J-Series Coffee Machines
Open Manual (Page 43)Search more codes in this manual