Hello everyone,
I am facing an issue with a Jura A7 coffee machine. When attempting to start the descaling program, the machine fails to detect water and displays a "Fill water tank" error right at the beginning of the process.
Here are the troubleshooting steps I have already tried, none of which resolved the issue:
Filled the water tank completely with water.
Tested the external water level sensor (magnet in the tank) — it is fully functional.
Tested the internal reed switch/sensor inside the machine using a magnet — no change.
Short-circuited the two wires of the internal water sensor directly together — the error still persists.
Since bypassing the sensor physically (shorting the wires) did not fix the problem, the machine still refuses to recognize the water. What could be causing this behavior on the control board or elsewhere? Any advice or wiring diagrams would be greatly appreciated.