E19 appears and the dishwasher may not switch between wash zones or may have poor spray performance in one rack.

Safety first: Disconnect power and turn off water before accessing the base.

• Confirm symptom: Note if only the upper or lower rack is being cleaned, or if spray arms stop intermittently.
• Access diverter assembly: Remove the toe-kick and locate the diverter valve on the sump or circulation pump outlet.
• Inspect for debris: Remove the diverter cover and check for broken plastic, food debris, or glass preventing rotation. Clean thoroughly.
• Test diverter motor: Disconnect the motor and measure resistance. An open circuit indicates a failed motor. If accessible, apply test voltage per Viking specs to confirm operation.
• Check position sensor: Some models use a reed switch or Hall sensor to detect diverter position. Inspect and test according to service data.
• Replace diverter assembly: If the motor or sensor is faulty, install a new Viking diverter valve assembly.