Display shows E9; machine beeps and shuts down when solution tank is low or recently refilled.

Safety first: Unplug the machine before removing tanks.

• Remove and inspect solution tank: Check that the tank is not warped or cracked and that it seats fully into the base.
• Check float and magnet: If the tank uses a float with a magnet, ensure it moves freely and is not fouled by scale or debris.
• Inspect reed switch or sensor: On the machine body, locate the level sensor (often a small plastic housing). Check for damage and ensure it is firmly mounted.
• Clean contact surfaces: Wipe the tank and sensor area to remove detergent residue that may interfere with sensor operation.
• Check wiring: Follow the sensor wires to the PCB and reseat the connector.
• Test: Refit the tank correctly and test. If E9 persists, the level sensor or PCB input may need replacement.