Editorial & technical review
- Written by ApplianceWorth Editorial Team
- Technically reviewed by Victor — appliance technician
- Last reviewed 2026-07-01
- Applies to Samsung range / ovens
- Confidence medium
- Also displayed as C21, E0A
- Sources Manufacturer service documentation and field-repair experience · Methodology · Report a correction
What this code means
The oven detected a temperature above its normal operating limit outside self-cleaning operation.
Most likely causes
- A temperature sensor is reading incorrectly
- A bake or broil relay is stuck on
- Airflow around the oven vent is blocked
- The main control is not regulating heat correctly
Safe checks for the owner
- Turn the oven off. If heating continues, switch off the circuit breaker or gas supply as appropriate.
- Keep combustible items away and allow the appliance to cool.
- Do not use the oven again until it has been diagnosed.
Estimated U.S. repair cost
$350–$750, depending on model, access, parts availability and local labor.