Jura · J-Series Coffee Machines
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.
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Ensure the water tank is properly seated in the machine.
Remove the water tank, empty it, and then refill and reinsert it.
Descale the water tank according to the machine's maintenance instructions (see Chapter 5 'Maintenance – Descaling the water tank').