For the Samsung Oven & Range families covered by the source set, **C-21** means **sensor malfunction**. The first useful step is to preserve the exact characters and model number before power cycling the appliance. Samsung uses overlapping code conventions across model years and regions. This page keeps the appliance context attached to the code so a same-looking string from another product family is not misapplied. The recorded display form is **C-21**. Search normalization stores it as **C21** while preserving the characters a homeowner actually sees.
Content status: Verified
Sensor malfunction.
Model compatibility: Samsung can reuse or reformat codes across series and model years, so C21 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
For the Samsung Oven & Range families covered by the source set, **C-21** means **sensor malfunction**. The first useful step is to preserve the exact characters and model number before power cycling the appliance. Samsung uses overlapping code conventions across model years and regions. This page keeps the appliance context attached to the code so a same-looking string from another product family is not misapplied. The recorded display form is **C-21**. Search normalization stores it as **C21** while preserving the characters a homeowner actually sees.
These are simple, non-hazardous checks only. If anything is unclear, stop and contact a technician.
Important safety warning. Safety takes priority over clearing C-21. Stop for arcing, repeated breaker trips, uncontrolled heating, damaged wiring, or gas odor. Internal live-voltage and gas-system diagnosis is not a homeowner check.
Once C-21 has returned after the safe checks, If the code returns, model-specific sensor, harness, connector, and control-board testing is appropriate. Preserve any accompanying noise, water level, temperature, or operating-stage details for the technician.
Book your repair
Book a specialist visit for a clear estimate and approval before any repair.
We diagnose Samsung oven and range no-heat, temperature errors, control issues and surface-cooking problems.
Sensor malfunction.
Resetting can clear a temporary state, not a persistent issue. If **C-21** comes back, preserve the code and move to the safe checks or model-specific service path.
Short owner-accessible checks may be reasonable when the appliance is safe. Persistent **C-21**, worsening performance, or any electrical/water/heat hazard is a reason to stop use.
Treat **C-21** as a starting point, not a replacement instruction. Wiring, feedback signals, operating conditions, and electronic controls can mimic a failed component.
The same-looking code can be reused on another Samsung appliance family or reformatted by region/model year. Match the appliance type and exact model before applying a meaning. This page therefore keeps **Oven & Range C-21** separate from same-looking codes used by other Samsung appliance families.
Book your repair
Tell us the symptom, appliance and any code you see. We’ll use those details to start with a focused diagnostic path.
Share a few details and we’ll confirm an appointment. Prefer to talk? Call us and we’ll help right away.
