Water tank icon flashes even when tank is full; machine will not brew

User checks:

• Remove and reinsert the water tank firmly.
• Inspect the tank for a magnet or float; ensure it moves freely and is not stuck by scale.
• Clean the tank thoroughly and rinse.

Sensor checks:

• Open the housing and locate the tank sensor (reed switch or Hall sensor) near the tank area.
• Test the sensor with a magnet and multimeter; replace if it does not change state.
• Check wiring from the sensor to the main PCB.