Machine shows E12 and does not recognize the water tank

Safety first: Turn off and unplug the machine before inspecting sensors.

User checks:

• Inspect water tank: Remove the tank and check that the float or magnet inside moves freely. Clean any scale or debris and ensure it is not stuck.
• Re-seat tank: Reinsert the tank firmly, making sure it is fully engaged with the machine's inlet and sensor area.
• Test without filter: If a water filter is installed, remove it and test again to rule out flow restriction or misalignment.

Sensor inspection (advanced):

• Access the area behind the tank where the reed switch or Hall sensor is located.
• Check for loose connections or broken wires.
• Use a small magnet to test the sensor: with the machine on, move the magnet near the sensor area and see if the tank-present message changes.

If the sensor does not respond, replace the reed switch/Hall sensor assembly. If E12 persists after sensor replacement, the main control board may be at fault.