Display shows E08; machine may not detect the water tank or stops with a water supply error even when tank is full.

Safety first: Unplug the machine before inspecting internal sensors. Do not spill water into the electronics area.

• Reseat the water tank: Remove and firmly reinsert the tank, ensuring it is fully pushed in and level.
• Clean the tank and float: If your tank has a floating magnet or mechanical float, clean it with warm soapy water to ensure it moves freely. Rinse thoroughly.
• Check for magnet: On some Bosch tanks, a small magnet is embedded in the float. If it has fallen out or is missing, the sensor will not detect the tank; the tank may need replacement.
• Clean sensor area: Wipe the area where the tank meets the machine, especially around any visible sensor window or contacts.
• If E08 remains: The internal reed switch or Hall sensor on the main chassis may be defective. Replacement requires opening the housing; contact Bosch service.