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Samsung Ovens & Ranges

Error Code C-21

Oven temperature exceeds safe limits during heating

Critical

Stop using immediately - risk of damage or safety issue

Also displayed as: C-21

What This Means

Faulty oven sensor; Shorted heater relay; Heater element stuck on; Defective sensor harness connection; Main PCB relay failure

What actually causes this:

Heater relay stuck closed, sensor malfunction, or uncontrolled heating element

First Thing to Check

Verify sensor reads 1kΩ resistance; check if heater stays energized

Parts Involved

Oven sensorBake relayBroil relayConvection relayDLB relayMain PCBDisplay PCB

How to Fix

  1. 1

    Measure sensor resistance (should be 1kΩ at room temperature)

  2. 2

    Check broil, bake, and convection heater resistance values

  3. 3

    Test DLB, Broil, Bake, and Convection heater relays for proper operation

  4. 4

    Check harness connections to main PCB

  5. 5

    Measure oven sensor connector resistance on main PCB (normal: 2850Ω)

This Error Applies To

Samsung DOP30T Series Ovens & Ranges

Service manual exact match: DOP30T840GS/DAService manual exact match: DOP30T940DS/**Service manual exact match: DOP30T940**

Related Error Codes

C-A2

Cooling fan failure causing sub PCB overheating

C-d1

Door lock motor or switch failure

C-20

Temperature sensor open or shorted

C-F0

PCB to PCB communication lost

C-F2

Touch control panel not communicating with main processor

C-d0

Touch panel key continuously triggered or short circuit

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