Fault Phenomenon: Co-Nele KNL5500 water level is normal when cold. During cleaning operations (operating temperature), a water level false alarm occurs, the water pump automatically stops, and cleaning is impossible.

Troubleshooting Process:
– Checked water tank level: level sufficient.
– Checked water level sensor: sensor installed securely.
– Checked alarm wiring: no short circuit.
– Measured sensor resistance at operating temperature: found resistance drift.

Root Cause: The water level sensor probe oxidizes due to heat, causing signal misjudgment.

Required Parts: Water level sensor assembly.