E03 — Door Lock Fault
Bosch's official US washer error-code page has no E03 entry at all — the official door-lock fault is listed as E16/E34/F16/F34, not E03. Treat 'bosch-washer-e03' as outside the official US namespace; the 'door lock fault' explanation below (not a drain fault, per an earlier correction) is plausible but unconfirmed on Bosch's US consumer page — verify against your model's manual.
- Keep using it?
- Yes, with caution
- DIY difficulty
- Easy
- Verified against
- bosch-home.com ↗
How to fix it
- Open and firmly re-close the door; confirm nothing blocks the latch or striker.
- Inspect the door striker and latch for damage or misalignment.
- Test the door lock / interlock assembly for continuity in the locked state.
- Check the wiring between the door lock and the control board.
- Replace the door lock assembly if it fails to lock or does not report locked.
Why it happens
Typical signs: E03 shown at the start of a cycle · Door will not lock / cycle will not start · Audible click from the lock but no start · Door feels closed but is not recognized as latched
- Door not fully latched Make sure the door is firmly closed and nothing (laundry, gasket fold) is blocking the latch.
- Failed door lock / interlock assembly The electronic door lock has failed or its switch no longer reports “locked.”
- Wiring to the door lock Broken or corroded wiring between the lock and the control board.
- Control board (less common) Only after the lock and wiring test good.
Parts you may need
If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.
- Bosch washer door lock assembly Common replacementAmazon →
More Bosch washer codes
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: bosch-home.com.