Dishwasher displays E13, often associated with excessively hot incoming water.

Safety first: Be cautious of scalding hot water when testing taps.

• Check hot water temperature: Run the hot tap at the kitchen sink and measure the temperature with a thermometer. Bosch typically specifies a maximum inlet temperature (often around 60°C/140°F).
• Adjust water heater: If the temperature is too high, lower the setting on your water heater or mixing valve.
• Consider cold connection: In very hot supply situations, connect the dishwasher to a cold water line and allow the internal heater to warm the water.
• Reset dishwasher: After correcting the water temperature, turn off the breaker for 5 minutes, restore power, and run a test cycle.