Error code · Bosch
E0502 · Electronic fault 1
This error indicates an electronic fault. If the error appears again, contact service.
OvenCaution — Know When to StopFixLens verified
Safe first steps
- Turn off the oven by switching off the circuit breaker for a few seconds, then turn it back on.
- Check if the error code E0502 reappears after resetting the oven.
- If the error code appears again, ensure that the oven is not in demo mode by checking the basic settings.
- If the error persists after checking the settings, contact a service technician for further assistance.
When to stop
- Stop if the oven shows signs of electrical malfunction, such as unusual noises or burning smells — risk of electric shock or fire.
Likely cause
This error indicates an electronic fault. If the error appears again, contact service.
Verification
Reviewed by: automated manual extraction
Verified against Bosch HBG4390B3 technical documentation
FixLens publishes its own structured technical logic verified against Bosch HBG4390B3 documentation · last verified April 21, 2026.
Official manufacturer support