Samsung Oven Error C-21

⚡ Quick Answer: The Samsung Oven error C-21 indicates a malfunction related to temperature sensing, typically caused by a faulty temperature sensor or control board i... ✅ DIY Fixable

What Does Error C-21 Mean?

The Samsung Oven error C-21 indicates a malfunction related to temperature sensing, typically caused by a faulty temperature sensor or control board issue. Symptoms include the error code appearing on the control panel, the oven overheating or failing to maintain the set temperature, and incorrect internal temperature readings. If you hear a buzzing sound, it may further confirm the malfunction. Proper diagnosis and repair are essential to restore normal function.

Common Symptoms:

  • Error C‑21 displayed on control panel
  • Oven overheats or continues heating past set temperature
  • Oven fails to maintain or correctly read internal temperature

Possible Causes

  • Temperature sensor (thermistor) malfunction or abnormal resistance (medium)
  • Control board/regulator relay stuck or malfunctioning (medium)

How to Fix Error C-21

DIY Fix Basic oven reset and observation

  1. Turn off the oven and disconnect power (unplug or switch off at breaker)
  2. Wait at least 10–30 minutes for internal components to reset and cool
  3. Restore power and attempt normal operation to see if error persists

Technician Only Inspect and test temperature sensor and control board

  1. Disconnect oven from power supply
  2. Access the oven’s interior sensor (typically at the back of oven cavity)
  3. Visually inspect sensor and wiring for damage or loose connections
  4. Use a multimeter to test sensor resistance against expected values
  5. Check control board for signs of burnt components or stuck relays that may cause continuous heating
  6. Replace defective sensor or control board as identified

Parts needed: Temperature sensor (thermistor), Control board/PCB

🛑 When to Call a Pro:
  • If the oven repeatedly overheats during use
  • If error persists after reset and basic inspection
  • If you are not comfortable performing electrical tests or part replacements

Technical Specifications

wattage 3000W
component Heating Element
resistance 10-30 ohms
part_number DG94-01012A
voltage_rating 240V AC

Common Questions

What does C-21 error mean on Samsung Oven?

C-21 indicates a temperature sensor malfunction, causing overheating or incorrect temperature readings.

Can I fix Samsung Oven C-21 error myself?

Yes, you can perform a basic reset by disconnecting power for 10-30 minutes and observing if the error persists.

How much does it cost to fix C-21 error?

Repair costs typically range from $50 to $300, depending on parts and service needed.

When should I call a technician for C-21?

Call a technician if the oven overheats repeatedly, the error persists after a reset, or if you're uncomfortable with electrical repairs.

Sources & References

Data last verified: 2026-01-10

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