Bosch Dishwasher Error Code d:03

Error code d:03 means the dishwasher has detected a problem with the motor control temperature sensor. This sensor monitors heat levels at the motor control unit to protect the motor and electronics. The control system logs d:03 when the sensor signal is absent, erratic, or outside the expected range. A technician should run diagnostic test P:04 and inspect the sensor and its wiring to pinpoint the fault.

It is not recommended to continue running the dishwasher while d:03 is active. The motor control temperature sensor exists to protect the motor and control electronics from heat damage, and operating without a functioning sensor removes that protection. Continued use could result in further damage to more expensive components such as the motor control board or the drive motor itself.

A basic reset may temporarily clear the error code from the display, but d:03 will return as soon as the control system checks the motor control temperature sensor again during the next cycle. Because the code indicates an actual hardware fault, a reset does not address the underlying problem. The sensor, wiring, and connector need to be properly diagnosed and repaired before the fault will clear permanently.

Some causes of d:03 are accessible to a confident DIYer, such as reseating a loose connector or drying out a corroded harness. However, safely accessing the motor control area requires disassembling portions of the dishwasher and working near electrical components, so comfort with appliance repair is important. If diagnostic test P:04 confirms the sensor has failed, replacing the part typically requires correct identification of the sensor for your specific model. When in doubt, a qualified appliance technician is the safer option.

Repair costs vary depending on the root cause. If only the temperature sensor needs replacement, parts and labor typically fall in the range of $80 to $200. If the wiring harness requires repair or replacement the cost may be similar. A failed motor control board is significantly more expensive, with parts and labor potentially ranging from $200 to $450 or more depending on the model and service rates in your area.