C-21Samsung Oven — Samsung Oven C-21 Error Code
Oven overheated during self-clean
Severity
Critical
Difficulty
Easy
Est. Cost
What's Happening
The oven temperature exceeded the safe limit during self-clean. The oven locks the door as a safety measure until it cools down. This can take several hours.
How to Fix It
Wait for the oven to cool completely — do not try to force the door open. Once cooled, the door should unlock and the code should clear. If the error keeps appearing during self-clean, reduce the cleaning duration or have the temperature sensor and control board checked.
Frequently Asked Questions
What does C-21 mean on a Samsung oven?
C-21 means the oven overheated during the self-clean cycle. The door locks as a safety measure until the oven cools down.
How long does it take for a Samsung oven to cool after C-21?
It can take 2-4 hours for the oven to cool enough for the door to unlock. Don't try to force it open — the lock releases automatically once safe.
Can I prevent the C-21 error during self-clean?
Try using a shorter self-clean duration. Remove heavy food residue manually before running self-clean. If C-21 occurs repeatedly, the temperature sensor may need replacement.