Dishwasher shows E30 and will not start; often accompanied by continuous draining.

Safety first: Unplug the appliance and close the water tap. Expect water in the base tray.

• Drain base: Tilt the dishwasher to allow water to escape from the base tray onto towels. This may temporarily clear E30.
• Inspect for leaks: Remove the base panel and run a short cycle while observing. Look for drips from hoses, pump seals, heater joints, and the tub.
• Common repairs: Tighten or replace hose clamps, replace leaking hoses, and replace the circulation pump seal or complete pump if leaking at the shaft.
• Check overfill causes: Verify that the inlet valve closes properly and that the pressure switch and hose are functioning to prevent overfilling.