Samsung Microwave Error C-20

⚡ Quick Answer: The Samsung microwave C-20 error indicates a malfunction related to the temperature sensor, commonly occurring during or immediately after a heating c... ✅ DIY Fixable

What Does Error C-20 Mean?

The Samsung microwave C-20 error indicates a malfunction related to the temperature sensor, commonly occurring during or immediately after a heating cycle. Symptoms include the error code displayed on the control panel, a failure to heat food, and unusual buzzing sounds. This issue is typically caused by a fault in the temperature sensor, which may be open or shorted, leading to the microwave locking out operation to prevent overheating.

Common Symptoms:

  • Error displayed on microwave control panel
  • Microwave may stop heating or lock out operation
  • Occurs during or immediately after heating cycle

Possible Causes

  • Temperature sensor fault (open or short) (high)

How to Fix Error C-20

DIY Fix Power cycle microwave and check operation

  1. Disconnect microwave from power for at least 60 seconds
  2. Reconnect power and attempt to run a simple heating cycle
  3. Observe if C‑20 returns

Technician Only Diagnose and replace temperature sensor or repair wiring

  1. Enter service mode or open microwave per model service manual
  2. Test temperature sensor resistance values and compare to spec
  3. Inspect wiring harness between temperature sensor and main PCB for continuity and damage
  4. Replace faulty temperature sensor or repair wiring as needed

Parts needed: Temperature sensor, Wiring harness/connectors

🛑 When to Call a Pro:
  • If C‑20 code persists after power cycling
  • If unit overheats or shows other fault codes
  • Internal diagnostics indicate open/short sensor requiring replacement

Technical Specifications

wattage 1000W
component Magnetron
resistance 1-3 ohms
part_number DE74-20019A
voltage_rating 120V AC

Common Questions

What does C-20 error mean on Samsung microwave?

C-20 indicates a temperature sensor malfunction, causing heating issues and error display.

Can I fix Samsung microwave C-20 error myself?

Yes, try power cycling the microwave by disconnecting it for 60 seconds to see if the error returns.

How much does it cost to fix C-20 error?

Estimated repair costs range from $50 to $150, including parts and labor.

When should I call a technician for C-20?

Call a technician if the C-20 error persists after power cycling or if the unit shows other fault codes.

Sources & References

Data last verified: 2026-01-11

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