Bosch Washer Error Code Er:03

Er:03 means the door lock failed to engage when the washer attempted to start a cycle. The control board sends a signal to lock the door and waits for confirmation that the lock has actuated. If that confirmation does not come back, the washer halts and displays Er:03. The most common causes are a jammed lock mechanism or a wiring problem in the door lock circuit.

No. The washer intentionally prevents operation when Er:03 is active because the door lock must be confirmed as engaged before a wash cycle runs. Running a washer with an unsecured door creates a risk of the door opening during a cycle, which can cause water leakage and potential injury. The machine should not be used until the underlying fault is resolved.

Repair costs depend on what component is at fault. A replacement door lock assembly typically costs between $30 and $80 for the part alone, with professional labor adding $80 to $150 depending on your area. Wire harness repairs can be less expensive if only a connector needs reseating or a short section of wire needs repair. Control board replacement is the most expensive outcome, with parts alone ranging from $150 to $350 or more.

Some causes of Er:03 are DIY-friendly. Checking for obstructions around the door latch, verifying that all wire connectors are fully seated, and inspecting the door alignment for hinge issues are all tasks within reach of a careful DIYer. Replacing the door lock assembly is also straightforward on most Bosch models and requires only basic tools. Control board diagnosis and replacement are better left to a qualified technician.

A reset may temporarily clear the code from the display, but Er:03 will return immediately when the washer attempts to lock the door again if the underlying problem has not been fixed. A reset is useful for confirming whether the fault is intermittent, such as a loose connector, but it is not a permanent solution. The door lock mechanism and wiring must be inspected and repaired to resolve the error.