Samsung oven C-21 error code
C-21 means oven temperature sensor short. The sensor circuit is shorted — the same blocking condition as C-20 but the other end of the fault range..
Engineer usually needed · Fault type: Electrical/hardware
Safe checks, in order of likelihood
- Power-cycle at the mains for 10 minutes.
- If C-21 returns, the sensor or its harness is shorted and needs replacement.
- Check the sensor probe is not touching the element or cavity walls.
Call a professional when…
Sensor or wiring harness replaced. If the code returns after these checks, book a qualified engineer.
Parts usually involved
- Samsung oven NTC sensor and harness.