Bosch Dishwasher Error Code 1100

Error code 1100 on a Bosch dishwasher signals an inverter error caused by motor asymmetry. This means the inverter board has detected an unequal electrical load across the pump motor's windings or phases. The dishwasher halts operation to prevent damage to the motor or inverter. Diagnosis starts with checking the connectors and wire harness between the inverter and the motor.

It is not recommended to continue running the dishwasher while error code 1100 is active. The fault indicates an electrical imbalance in the motor circuit, and continued operation could worsen damage to the pump motor or the inverter board. Stop using the appliance until the cause has been diagnosed and corrected.

Resetting the dishwasher by cutting power for a few minutes may temporarily clear the fault display, but the error code will return as soon as the inverter detects motor asymmetry again during operation. A reset does not fix the underlying electrical or mechanical problem. Proper diagnosis and repair of the wiring, motor, or inverter board is required to permanently resolve the fault.

Some causes of error code 1100 are DIY-accessible, such as reseating a loose connector or inspecting the wire harness for visible damage. However, testing motor winding resistance and evaluating the inverter board require a multimeter and comfort working with appliance electronics. If the motor or inverter board needs replacement, most homeowners will want a qualified technician to complete the repair.

Repair costs depend on the failed component. Replacing a wire harness typically falls in the range of $75 to $200 including parts and labor. A new circulation pump motor can cost between $150 and $350 installed. An inverter board replacement is generally the most expensive option, often ranging from $200 to $450 depending on the model and labor rates in your area.