Dishwasher fills with water but does not start washing; only a humming sound is heard

Safety first: Disconnect power and drain water from the tank before accessing the pump.

• 1. Drain the tank: Manually activate a drain or bail out water to access the sump safely.
• 2. Inspect for obstructions: Remove filters and check the pump inlet for debris. Access the pump housing and clear any jammed objects.
• 3. Check impeller movement: With power off, try to rotate the pump shaft or impeller by hand. If stiff or seized, the pump may need replacement.
• 4. Test capacitor: If equipped, test the wash motor capacitor with a capacitance meter. Replace if out of tolerance.
• When to call a technician: Pump and capacitor replacement involve electrical and plumbing work; professional service is recommended.