Dishwasher displays H30 and will not start, often accompanied by pump running continuously

Safety first: Disconnect power and close the water tap. Be cautious of water on the floor causing slip hazards.

• Check for water in base: Pull the dishwasher out and tilt it slightly backward or to one side. If water pours from the base, the anti-flood float has been triggered.
• Dry the base: Remove the bottom panel and soak up all water from the base tray. Allow components to dry completely.
• Inspect for leak source: While the base is open, visually inspect the sump gasket, circulation pump seals, inlet hose, drain hose, and side water channels for signs of dripping or mineral trails.
• Check detergent use: Overuse of regular dish soap can cause foam overflow. Use only Panasonic-approved dishwasher detergents and correct dosage.

After drying, run a short cycle while observing the underside for leaks. If H30 recurs, repair or replace the leaking component (sump seal, hose, pump) or consult a technician.