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Error code reference

Bosch Washer Error Code E:03

Door lock doesn't unlock

Bosch codesBosch washer codes

Door lock doesn't unlock — jammed lock or bad wire harness.

First step from the service manual

Check door lock mechanism and wire harness for jamming or damage.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What E:03 means on a Bosch washer

The E:03 error code on a Bosch washer indicates that the door lock mechanism has failed to release at the end of a wash cycle or during a cycle that requires the door to unlock. The door lock assembly, also called the door latch or interlock, is an electromechanical component that both secures the door during operation and signals the control board that the door is properly closed. When the control board sends the unlock command and does not receive confirmation that the latch has released, it registers E:03 and halts normal operation.

The two primary causes of this fault are a physically jammed or failed door lock mechanism and a damaged or disconnected wire harness connecting the lock to the main control board. A jammed lock can occur due to worn internal components within the latch assembly, debris obstructing the latch bolt, or a broken solenoid inside the lock that no longer retracts the bolt on command. In either case, the door remains physically or electrically stuck in the locked position.

Diagnosis begins with a physical inspection of the door lock mechanism and the wire harness leading to it. Technicians should check for visible damage to the wiring, loose connector terminals, and signs of burning or corrosion at the harness plug. If the harness checks out, the lock assembly itself should be tested for proper electrical function and replaced if the solenoid or latch mechanism is faulty.

Source: manufacturer service documentation.

Common causes of E:03

  1. 01

    Failed door lock solenoid or latch mechanism

    Part replacement

    The internal solenoid inside the door lock assembly can wear out or burn out, preventing the latch bolt from retracting. This is the most frequent cause of E:03 and usually requires replacing the entire door lock assembly.

  2. 02

    Jammed latch bolt

    Wiring / connection

    Debris, a deformed strike plate, or a misaligned door can physically obstruct the latch bolt from releasing. Inspect the door latch area for foreign objects and check that the door itself is not warped or misaligned.

  3. 03

    Damaged or disconnected wire harness

    Wiring / connection

    The wiring between the door lock assembly and the control board can become frayed, pinched, or disconnected over time. Check the harness connector at the lock for looseness, corrosion, or visible wire damage.

  4. 04

    Corroded or loose connector terminals

    Wiring / connection

    Even without visible wire damage, the terminals inside the harness connector at the door lock can corrode or back out of the connector housing, breaking the electrical circuit. Clean or reseat the terminals and retest.

  5. 05

    Control board communication fault

    Part replacement

    In less common cases, the main control board may fail to send the correct unlock signal to the door lock. If the lock assembly and wiring both test correctly, a control board fault should be considered.

See the test procedure for each cause

Frequently asked questions about E:03

What does E:03 mean on a Bosch washer?
E:03 means the washer's door lock has failed to unlock when it was supposed to. The control board sent the command to release the door latch but did not get confirmation that the lock opened. This is caused by either a jammed or faulty door lock mechanism or a problem with the wire harness connected to it.
How do I fix the E:03 error on my Bosch washer?
Start by inspecting the door lock assembly for physical obstructions and checking the wire harness and connector for damage, looseness, or corrosion. If the wiring is intact, test the door lock mechanism itself for proper operation. A faulty lock assembly will need to be replaced to clear the error permanently.
Will resetting my Bosch washer clear the E:03 error?
A reset may temporarily clear the error display, but if the underlying cause is a faulty door lock or damaged wiring, the code will return as soon as the machine attempts to lock or unlock the door again. A reset is not a fix and should only be used as part of the diagnostic process after addressing the root cause.
Is it safe to use my Bosch washer when it shows E:03?
You should not attempt to force the door open or continue using the washer until the fault is diagnosed and repaired. The error indicates a failure in the door lock system, which is a critical safety component. Running the machine with a compromised door lock could result in water leakage or the door opening unexpectedly during a cycle.
How much does it cost to repair an E:03 error on a Bosch washer?
If only the wire harness connector needs cleaning or reseating, the repair cost may be minimal, covering just a service call. If the door lock assembly needs to be replaced, total repair costs including parts and labor typically range from around 100 dollars to 250 dollars depending on the specific model and your location. Control board replacement, if required, would fall at the higher end of repair costs.

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