Dishwasher displays E20; unit may hum but not start washing, or may stop shortly after starting.

Safety first: Disconnect power before accessing the motor and capacitor.

• Listen for hum: Start a cycle and listen. A loud hum followed by E20 suggests the motor is trying to start but cannot turn.
• Access circulation pump: Remove lower panel and tilt or pull out the dishwasher. Locate the wash motor and pump assembly.
• Check for obstructions: Remove the pump and inspect the impeller for debris or foreign objects. Clear any blockage and ensure the impeller spins freely.
• Test start capacitor (if equipped): Disconnect the capacitor and test with a capacitance meter. Replace if out of specification or visibly swollen.
• Inspect motor: If the motor shaft is stiff or seized, or windings test open, replace the circulation pump/motor assembly.