Bosch Oven Error E04 — What It Means & How to Fix It

What Does This Error Mean?

E04 on a Bosch oven means the automatic door lock mechanism has a fault. This applies to pyrolytic (self-cleaning) ovens — the door must lock automatically during the cleaning cycle. E04 means the lock failed to engage, disengage, or the lock motor reported an error.

Affected Models

Bosch HBG675BS1B
Bosch HBG7764B1
Bosch Serie 8 Pyrolytic Oven
Bosch Serie 6 Pyrolytic Oven
All Bosch pyrolytic self-cleaning built-in ovens

Common Causes

Door lock motor failed — the small motor that drives the locking bolt has burned out
Door lock mechanism jammed — debris or food residue preventing the bolt from moving
Door lock microswitch fault — confirming the locked or unlocked state incorrectly
Door hinge worn — door is not aligning correctly with the lock receiver
Control board fault sending incorrect signals to the lock motor

How to Fix It

Switch the oven off at the wall for 5 minutes, then power back on.

If the lock motor was stuck mid-cycle, a power reset may allow it to return to the home position. Check whether the door opens freely after the reset.
Check the door hinges — open and close the door and observe whether it moves smoothly.

A door that droops or does not align squarely with the oven frame will prevent the lock bolt from engaging correctly.
Inspect the door lock area for food debris or grease buildup.

The lock mechanism is near the top of the oven door on most models. Grease buildup can physically obstruct the bolt. Clean the area carefully when the oven is completely cool.
Do not attempt a pyrolytic self-clean cycle until E04 is repaired.

A pyrolytic cycle at 500 degrees C with an unlocked door is a serious safety hazard.
Call Bosch service for door lock motor inspection and replacement.

A lock motor is typically £30–60 for the part. Total repair with technician labour is usually £100–200.

When to Call a Professional

Door lock motor replacement requires a technician on most Bosch oven models. The lock mechanism is part of the door frame and requires significant disassembly. Contact Bosch service — do not attempt a pyrolytic cycle with an E04 fault present.

Frequently Asked Questions

Can I use my Bosch oven for normal cooking with an E04 error?

Yes — E04 only affects the door lock mechanism used during pyrolytic self-cleaning. For regular cooking functions (fan, grill, conventional), the oven should still work normally. Just do not attempt a pyrolytic cycle until the lock fault is repaired.