E17 displayed; wash tank level sensor indicates inconsistent readings, machine may alternately fill and drain.

Safety first: Turn off power and allow the machine to cool before accessing the level sensor.

• Locate level sensor: Find the pressure switch or electronic level sensor connected to the wash tank via a small hose.
• Clean sensor hose: Remove the hose from both ends and flush with hot water to remove grease and scale. Ensure it is not kinked when reinstalled.
• Check for foam issues: Excessive foaming from incorrect detergent can cause false level readings. Verify that the correct low-foam detergent is being used and dosing is correct.
• Test pressure switch: For mechanical switches, apply gentle air pressure and listen for clicks while checking continuity with a meter. Replace if switching is unreliable.
• Inspect connectors: Ensure all electrical connectors to the sensor are clean and firmly seated.
• Run a test cycle: After cleaning and testing, run the machine and observe fill behavior. Persistent E17 may indicate a defective electronic level sensor or control board.