Unit displays ADD WATER even though the reservoir is full; intermittent or constant.

Safety first: Unplug the ice maker and drain water before working on the sensor.

Steps to correct false ADD WATER:

• Clean float/probes: Remove the float or access the probes and clean them thoroughly with vinegar to remove scale.
• Check buoyancy: Ensure the float actually floats in water and is not filled with water or damaged.
• Inspect wiring: Confirm the water level sensor harness is intact and firmly connected.
• Test operation: Refill the reservoir and run the unit. If the error returns, the sensor may be defective.
• Replace sensor: Install a new water level sensor / float switch compatible with your Silonn model.

When to call a professional: If wiring and sensor are good, the control board input may be faulty and require service.