Dishwasher shows E13; water may be entering too slowly or intermittently, sometimes accompanied by unusual fill noises.

Safety first: Disconnect power and close the water tap.

• Access side water matrix: Remove the left or right side panel (depending on model) to expose the transparent water matrix and flow meter assembly.
• Inspect for scale and debris: Look for white limescale or food particles in the channels. Remove the matrix if necessary and flush thoroughly with hot water and descaler.
• Check flow meter: The flow meter is usually a small device clipped into the matrix with wires attached. Ensure the connector is firmly seated and wires are intact.
• Test operation: After cleaning, reassemble and run a fill cycle. If E13 persists, the flow meter may be defective and should be replaced.