Dishwasher displays E4 and may run the drain pump continuously; sometimes water is found in the base tray.

Safety first: Unplug the dishwasher and turn off the water supply. Expect water spillage when tilting the appliance.

• Check for leaks: Carefully pull the Baumatic dishwasher out from under the counter. Tilt it slightly backward or to one side (about 30–45°) over towels to see if water drains from the base.
• Dry the base: Remove the lower front panel (if possible) and gently dry the base tray and float switch area with towels or a sponge. Do not damage the float or microswitch.
• Inspect internal hoses: With side panels removed, inspect circulation hoses, drain hose connections, and the sump seal for signs of drips or mineral tracks. Tighten hose clamps and replace any cracked hoses.
• Check detergent use: Over-foaming from hand-wash liquid can cause leaks. Use only dishwasher tablets or powder and correct dosage.
• Test run: Once dry and reassembled, run a short cycle while observing for leaks. If E4 returns, a component such as the inlet valve, circulation pump seal, or sump gasket may need replacement.