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Samsung Oven Error Code C-20

Reviewed by the ApplianceErrors Editorial Team · Verified against manufacturer service documentation · Last verified: July 19, 2026
⚠ High Severity 🔧 Easy DIY Also shown as: C-20°

Oven temperature sensor fault — check needed

The most common cause of the C-20 error on a Samsung oven is temperature sensor (NTC) open or out of range (~60% of cases); start with: power cycle the oven.

💰 DIY cost: $25–$55 👨‍🔧 Pro cost: $150–$280 Save $125+ by doing it yourself
Samsung Oven error code C-20 on the display panel
How the C-20 code appears on a Samsung oven display

What Does Error Code C-20 Mean on a Samsung Oven?

Oven temperature sensor fault — check needed.

C-20 fires when the control board reads the oven's resistance-based temperature sensor and sees a value outside its valid window — typically an open circuit or a resistance too high or low to represent a plausible cavity temperature. The board halts heating because it has no trustworthy feedback. This differs from C-21, which usually flags a shorted or over-range sensor, and from E-08/E-09 errors that point more toward heating or control-side faults rather than a missing sensor signal.

Models affected: Samsung electric and gas ovens using an RTD-style cavity temperature sensor, including many freestanding and slide-in ranges roughly 2016 onward
What owners report: Owners commonly report C-20 appearing at startup or partway through preheat, sometimes after a self-clean cycle stresses the sensor. A loose or corroded 2-pin connector can mimic a dead sensor, so reseating it is a frequent quick win before buying parts; a brief power cycle occasionally clears a one-off glitch.

What Causes Error Code C-20?

Here are the most common causes in order of frequency. Start with the most likely cause before moving to the next:

  1. 1
    Temperature sensor (NTC) open or out of range 60% of cases
  2. 2
    Connector at the sensor loose/corroded 25% of cases
  3. 3
    Wiring to the sensor damaged 10% of cases
  4. 4
    Control board sensor input fault 5% of cases

How to Fix Samsung Oven Error Code C-20

🔧 Easy DIY Est. time: 10–20 min
⚡ Safety first: Unplug the appliance before opening any panels or touching internal components.
  1. 1

    Power cycle the oven

    Turn off the power for 30 seconds or more, then restart to clear a transient.

  2. 2

    Test the sensor

    Disconnect the sensor and measure resistance (about 1,080–1,090 ohms at room temperature). An open reading means a failed sensor.

    🔩 Multimeter
  3. 3

    Reseat the connector

    Corrosion on the 2-pin sensor connector can mimic an open circuit.

  4. 4

    Replace the temperature sensor

    The sensor is at the upper-rear of the cavity, 1–2 screws.

    🔩 Samsung oven temperature sensor ($25–$55)
    ⚠️ Let the oven cool before reaching inside.

How to Reset Error Code C-20

Power cycle 30 seconds. If C-20 returns, test and replace the temperature sensor.

Note: If the error returns after resetting, the underlying issue has not been resolved. Work through the fix steps above.

Full Samsung oven reset guide → Enter diagnostic mode →

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When to Call a Professional

If a new sensor reads correctly but C-20 persists, the control board sensor input has failed.

Average professional repair cost for this issue: $150–$280

Related Error Codes

C-21
Oven temperature too high — sensor reads above setpoint
🛑 Critical — Stop Using
E-08
Oven temperature sensor open circuit
⚠ High Severity
E-09
Oven temperature sensor short circuit
⚠ High Severity

Find Replacement Parts

Use these links to find the exact replacement parts for your Samsung Oven:

🔩
Search PartSelect
Samsung Oven repair parts
🔧
Search RepairClinic
Step-by-step video guides

External links — ApplianceErrors.com is not affiliated with these retailers.

More Samsung Oven Error Codes

SE Keypad/touchpad short — stuck button on control panel E-0A Oven overheating — temperature above safe limit NF No flame detected — gas ignition failure (gas range models) E-3 Door lock motor failure — self-clean door latch issue E-43 Power relay failure on main control board C-D0 Button/key problem — a key is registering as pressed

Frequently Asked Questions

Can I keep using my Samsung Oven when error C-20 appears? +
It is not advisable. The oven may still power on, but running it while C-20 is active can worsen the sensor fault or damage related parts. Treat it as a soon-as-possible repair.
What most commonly causes C-20 on a Samsung Oven? +
Across reported Samsung oven repairs, the most frequent is temperature sensor (NTC) open or out of range (60% of cases), connector at the sensor loose/corroded (25%), then wiring to the sensor damaged (10%). Check them in that order before replacing any parts.
C-20 keeps coming back after a reset — what should I check next? +
A reset only clears the stored C-20 fault; if it returns, the sensor problem is still present. Move on to the physical checks — power cycle the oven, then test the sensor — since the code will reappear until the root cause is resolved. This is a beginner-friendly job needing only basic hand tools.
How much does it cost to fix Samsung Oven error C-20? +
A DIY repair typically runs $25–$55 in parts, versus $150–$280 for a professional service call, so handling it yourself saves around $125. Expect the work to take about 10–20 minutes.
Which Samsung Oven models show error C-20? +
C-20 is documented on Samsung electric and gas ovens using an RTD-style cavity temperature sensor, including many freestanding and slide-in ranges roughly 2016 onward. Other units sharing the same control platform can display it too, so the fixes here generally transfer across the series.

Sources & References

Content verified against manufacturer service documentation. Last verified: July 19, 2026.

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