Dishwasher displays E12; may coincide with poor wash performance and unusual noises from the lower area.

Safety first: Disconnect power before working under or inside the dishwasher.

Step-by-step checks:

• Inspect spray arms: Ensure all spray arms rotate freely and are not hitting tall items or racks.
• Check for debris: Remove spray arms and clean out any debris from the mounting hubs and jets.
• Listen for motor noise: During a cycle, listen for grinding or clicking from the lower area that could indicate a failing spray arm motor or diverter.
• Under-unit inspection: From below, locate any auxiliary spray arm motors or zone wash actuators. Check for leaks, cracks, or loose connectors.
• Persistent E12: If the error returns after cleaning and inspection, the motor or control board may require professional diagnosis and replacement.

Warning: Water may spill when hoses are disconnected; protect flooring.