Bosch Dishwasher Error Code Er:03

Er:03 means the dishwasher attempted to lock the door but could not confirm the lock engaged successfully. The control board monitors the door lock during startup and will halt operation if the lock signal is not received. The cause may be mechanical, electrical, or related to a faulty component on the control board.

No. Er:03 indicates the door lock cannot be confirmed as engaged, and the dishwasher is designed to prevent operation in this state for safety reasons. Running a dishwasher with an unsecured door risks water leakage and potential injury. The underlying fault should be resolved before attempting to run a cycle.

Repair costs vary depending on the root cause. Replacing a door latch assembly typically runs in the range of $50 to $150 for parts, with additional labor costs if a technician is involved. A control board replacement is the most expensive scenario and can range from $150 to $350 or more for parts alone. Getting a diagnosis before committing to a repair is recommended to avoid replacing parts unnecessarily.

Some causes of Er:03 are DIY-friendly. You can check whether the door is fully closing, inspect the latch for visible damage, and examine the wire harness for loose or damaged connections. If the problem points to the door lock assembly or control board triac, those repairs are more involved and may require a technician with the ability to test components electrically.

A reset may temporarily clear the code display, but the error will return if the underlying problem with the door lock has not been fixed. Resetting is a reasonable first step to rule out a transient glitch, but if Er:03 reappears after the reset, a physical inspection of the latch, wiring, and lock assembly is necessary.