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

  1. Turn off the oven by switching off the circuit breaker for a few seconds, then turn it back on.
  2. Check if the error code E0502 reappears after resetting the oven.
  3. If the error code appears again, ensure that the oven is not in demo mode by checking the basic settings.
  4. 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.

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