Samsung Range C-20 — What It Means & How to Fix It
Also shown as C20 on some models.
C-20 is Samsung's oven temperature sensor error: the sensor circuit reads open, shorted, or out of range, so the control board can't trust the cavity temperature.
What this code means
C-20 flags the oven cavity temperature sensor circuit — the small resistance sensor mounted at the back of the cavity that reports temperature to the control board. When it reads open, shorted, or outside the expected range, the board can't manage heating and shows C-20, usually before preheat even begins. The sensor itself, its wiring, or the board reading it can be at fault; a power blip can also trip it once.
Samsung lists C-20 across its range, wall-oven, and microwave families with the same sensor-circuit meaning. On gas ranges the sensor wiring is near the gas valve wiring at the back — leave that area to a technician. The model number is on the frame behind the storage drawer or on the oven door frame.
Most likely causes
| Cause | How likely | DIY-fixable? |
|---|---|---|
| Oven temperature sensor failed open or shorted | Common | No — technician job |
| Loose or broken sensor connector at the rear | Common | Partly — inspect only |
| Sensor wiring chafed against the oven cabinet | Occasional | No — technician job |
| One-off glitch after a power event | Occasional | Yes — power reset |
What you can try yourself
- Press Stop/Cancel to clear the code, then try the oven again — Samsung's own first step for C-20.
- If it returns, turn the range off at the wall or breaker for 30 seconds and restart (also Samsung's suggested step before calling service).
- Check the sensor connector at the back of the oven cavity only if you're comfortable — it must be clean and seated, with an un-damaged lead.
- Recurring C-20 means a sensor, harness, or control-board diagnosis; a technician meters the sensor's resistance and checks the circuit before replacing anything.
When to call a technician
- C-20 returns after the reset steps — the sensor circuit genuinely needs a diagnosis.
- The oven heats erratically, runs far hotter or colder than the dial, or refuses to start preheat.
- You smell anything burning near the rear wiring access panel.
Typical professional repair cost: Oven temperature sensor replacement typically runs $150–$300 including labor; control-board diagnosis on top runs $200–$450.
Frequently asked questions
What does the oven temperature sensor actually do?
It's the probe in the back of the cavity that reports temperature continuously to the board, which switches the bake and broil elements to hold your setpoint. A dead sensor means the board is flying blind, so it refuses to heat normally.
Can a C-20 code happen without a bad part?
Yes — the reset steps exist precisely because power dips and the sensor self-test can throw a false reading. Samsung's guidance is to stop and restart, then power-cycle, before involving service.
Is the sensor replacement something I can do myself?
It's a screwin part on many models, but pulling the rear oven panel puts you next to gas lines on gas ranges and live wiring on electric ones. Unless you know that cavity, a technician change is the safer dollar for dollar.
Sources checked
Error meanings can vary by model. This guide was checked against the documentation above; use the manual for the model number on your own appliance when it differs.
Related Samsung codes
- Samsung Range C-24 C-24 is Samsung's fast-temperature-rise warning: the cavity heated quicker than expected, most often because the vent on the back of the cooktop is covered.
- Samsung Range C-21 C-21 is Samsung's over-temperature code: the oven sensor detected the cavity hotter than the setpoint and shut heating down to protect the unit.
- Samsung Range C-F0 C-F0 is Samsung's communication error between the main control board and the display: the two stopped talking. A restart clears most cases; induction models have an official software-update fix.
- Samsung Range S-01 S-01 is Samsung's safety shutoff: the oven ran continuously at its set temperature for hours and the board switched it off. It's a protection feature, not a fault — turn it off, remove the food, and use it normally.
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