Bosch Dishwasher Error Code dr:18

The dr:18 code means the dishwasher's control system has detected that the peak voltage from the power supply is too high. This is a protective fault that prevents the appliance from operating under electrical conditions that could damage its components. The error points to a problem with the incoming power supply rather than a mechanical fault inside the dishwasher.

Yes, this error should be taken seriously. Overvoltage conditions can damage the dishwasher's control board, motor, and other electronic components, and in some cases elevated voltage in home wiring can indicate a wiring fault that poses a broader electrical hazard. It is advisable to stop using the appliance and have the electrical supply inspected before resuming operation.

If the issue is traced to the home's electrical supply, costs will depend on the scope of the electrical work needed, which can range from a minor wiring fix to more involved panel repairs. Electrician service calls and repairs typically range from $100 to $500 or more depending on the issue found. If the control board was damaged by overvoltage and requires replacement, parts and labor for that repair can add several hundred dollars to the total cost.

Start by measuring the voltage at the dishwasher's power source with a multimeter to confirm whether the supply voltage is within the correct range for your model. If the voltage is too high or unstable, contact a licensed electrician to investigate the home's wiring, panel connections, and utility feed. Do not continue operating the dishwasher until the voltage issue has been corrected.

A reset may temporarily clear the code, but if the underlying voltage issue is not corrected, the error will return. Because the fault is triggered by the incoming power supply conditions, resetting the appliance without addressing the electrical source will not resolve the problem and could expose the dishwasher to repeated overvoltage events.