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Error code reference

Bosch Washer Error Code Er:01

Door open

Bosch codesBosch washer codes

Door open — door lock not engaged.

First step from the service manual

Check that door is properly closed and door lock is engaged.

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

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What Er:01 means on a Bosch washer

Er:01 on a Bosch washer indicates that the control system has detected the door is not properly closed or the door lock mechanism has not engaged. The washer's control board continuously monitors the door lock assembly, which includes both a mechanical latch and an electrical interlock switch. When the door is closed, the latch catches and the interlock switch sends a signal confirming the door is secured. If that signal is absent or interrupted at the start of a cycle, the machine displays Er:01 and refuses to run, preventing water from entering an unsecured drum.

The door lock assembly, sometimes called the door latch or interlock, is the most common component involved in this fault. It contains internal contacts that complete a circuit when the door is fully latched. Over time, these contacts can wear, corrode, or fail entirely. The plastic latch strike on the door itself can also crack or deform, preventing the hook from fully seating inside the lock body. Either condition will cause the control board to read an open-door state even when the door appears visually closed.

Additional causes include wiring harness issues between the door lock and the control board, such as loose connectors or chafed wires. In less common cases, the control board itself may misread the door lock signal. Always begin diagnosis by confirming the door closes firmly with an audible click, inspecting the latch and strike for damage, and checking that no laundry is caught in the door seal preventing full closure.

Source: manufacturer service documentation.

Common causes of Er:01

  1. 01

    Door not fully latched

    Wiring / connection

    The door may appear closed but not be fully seated. Push the door firmly until you hear an audible click confirming the latch has engaged.

  2. 02

    Laundry or debris caught in door seal

    Wiring / connection

    A garment or foreign object caught between the door and the rubber gasket can prevent the door from closing completely. Inspect the seal perimeter and remove any obstruction.

  3. 03

    Faulty door lock assembly

    Part replacement

    The internal contacts of the door lock interlock can wear out or corrode, causing the control board to read an open-door state even when the door is latched. The lock assembly will need to be tested and replaced if defective.

  4. 04

    Broken or cracked door latch strike

    Part replacement

    The plastic latch hook on the door itself can crack or deform over time, preventing it from fully seating inside the lock body. Inspect the hook visually for damage.

  5. 05

    Loose or damaged wiring to the door lock

    Wiring / connection

    The wiring harness connector at the door lock assembly can loosen or sustain damage, interrupting the signal sent to the control board. Inspect the connector and wiring for continuity and secure fit.

See the test procedure for each cause

Frequently asked questions about Er:01

What does Er:01 mean on a Bosch washer?
Er:01 means the washer's control system has detected that the door is not closed or the door lock has not engaged. The machine will not begin a cycle until it receives a confirmed signal from the door lock interlock. Check that the door is firmly latched and that nothing is blocking the door seal. If the error continues after confirming the door is shut, the door lock assembly may be faulty.
How do I fix the Er:01 error on my Bosch washer?
Start by pressing the door firmly closed until you hear a click, and remove any laundry caught in the door gasket. If the error clears, the issue was simply an unlatched door. If it persists, inspect the door latch strike for cracks and the door lock assembly for wear or damage. A faulty door lock assembly will need to be replaced to resolve the error permanently.
Is it safe to use my Bosch washer when Er:01 is displayed?
No. The Er:01 code is a safety interlock and the washer will not operate while it is active. This prevents the machine from filling with water while the door is unsecured, which could cause flooding or injury. Do not attempt to bypass the door lock. Resolve the underlying cause before running a cycle.
Will resetting my Bosch washer clear the Er:01 error?
A reset may temporarily clear the display, but the error will return immediately if the door lock is not engaging properly. To reset, turn the cycle selector to the off position, wait a minute, and restart. If Er:01 reappears as soon as you try to start a cycle, the door latch or lock assembly needs to be inspected and likely replaced.
How much does it cost to fix a Bosch washer showing Er:01?
If the fix is simply closing the door properly or clearing a blocked gasket, there is no parts cost. Replacing a door lock assembly typically costs between $30 and $90 for the part, with professional labor adding $80 to $150 depending on your location. Replacing a cracked door latch strike is generally less expensive than replacing the full lock assembly.

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