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Error code reference

Bosch Washer Error Code Er:02

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.

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

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What Er:02 means on a Bosch washer

The Er:02 error code on a Bosch washer indicates that the door lock mechanism has failed to release or unlock after a wash cycle. The door lock system relies on a motorized or solenoid-driven latch assembly that receives a signal from the control board to engage and disengage at specific points in the cycle. When the control board sends the unlock command but receives no confirmation that the lock has released, it triggers Er:02 and halts operation to prevent forced opening of the door.

The two primary causes of this fault are a mechanically jammed lock assembly and a break or short in the wire harness connecting the lock to the control board. A jammed lock can result from worn internal components within the latch mechanism, debris lodged in the strike plate area, or a bimetallic strip that has failed to reset after the cycle. In these cases, the physical lock may be stuck in the engaged position regardless of the electrical signal it receives.

The wire harness is the other critical area to inspect. A damaged, corroded, or pinched harness can interrupt the signal between the control board and the door lock assembly, causing the board to misread the lock state or fail to deliver the unlock voltage. Begin diagnostics by inspecting the harness along its entire routing for visible damage, then check the lock mechanism itself for mechanical binding or signs of thermal damage.

Source: manufacturer service documentation.

Common causes of Er:02

  1. 01

    Jammed or failed door lock assembly

    Part replacement

    The internal components of the door lock, including the bimetallic strip or solenoid, can wear out or seize, preventing the latch from releasing. You may notice the door physically will not open even after the cycle ends.

  2. 02

    Damaged or faulty wire harness

    Wiring / connection

    A pinched, corroded, or broken wire between the door lock and the control board can interrupt the unlock signal. Inspect the harness routing for any visible chafing, burn marks, or disconnected connectors.

  3. 03

    Debris obstructing the door latch strike

    Wiring / connection

    Foreign objects or detergent buildup around the door strike plate can physically block the latch from disengaging. Visually inspect and clean the strike area before replacing any components.

  4. 04

    Connector corrosion at the door lock plug

    Wiring / connection

    Moisture inside the door lock connector can cause oxidation that increases resistance and disrupts communication between the lock and the control board. Disconnect and inspect the connector terminals for green or white residue.

  5. 05

    Faulty control board

    Part replacement

    If the control board is not sending the correct unlock signal to the door lock assembly, the lock will remain engaged and trigger Er:02. This is the least common cause and should only be considered after the harness and lock assembly have been ruled out.

See the test procedure for each cause

Frequently asked questions about Er:02

What does Er:02 mean on a Bosch washer?
Er:02 means the washer's door lock failed to unlock after a cycle completed. The control board sent the unlock command but could not confirm the lock released. This points to either a mechanically jammed door lock assembly or a problem with the wire harness connecting the lock to the control board.
How do I fix Er:02 on a Bosch washer?
Start by inspecting the door lock mechanism for mechanical binding, debris around the strike plate, and any visible damage to the lock assembly itself. Next, trace the wire harness from the door lock to the control board and look for pinched wires, loose connectors, or corrosion. If the harness checks out and the lock is seized or shows signs of internal failure, the door lock assembly will need to be replaced.
Is it safe to use my Bosch washer when Er:02 is displayed?
You should not continue running wash cycles while Er:02 is active. The fault indicates the door lock is not functioning reliably, which means the door may fail to secure properly during a cycle. A door that cannot lock correctly poses a risk of water leakage and potential injury if the door opens during operation.
How much does it cost to repair a Bosch washer Er:02 error?
If the repair requires only cleaning the latch area or reseating a connector, the cost could be minimal or just your time. A replacement door lock assembly typically costs between $30 and $90 for the part. If professional labor is needed, total repair costs including diagnosis and installation generally range from $100 to $250 depending on your location and service provider.
Will resetting my Bosch washer clear the Er:02 error code?
A reset may temporarily clear the code from the display, but it will not resolve the underlying problem. If the door lock mechanism is jammed or the wire harness is damaged, the fault will return as soon as the washer attempts to unlock the door again. The root cause needs to be diagnosed and corrected before the machine will operate reliably.

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