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Samsung Ovens & Ranges

Error Code C-21

Oven temperature exceeds 650F (343C) or loses heating control

Critical

Stop using immediately - risk of damage or safety issue

Also displayed as: C-21

What This Means

Temperature sensor malfunction; Heater relay stuck on; PCB heating control failure; Damaged heater circuit

What actually causes this:

Defective temperature sensor, failed heater relay, or PCB malfunction allowing uncontrolled heating

First Thing to Check

Measure oven temperature sensor resistance

Parts Involved

Oven temperature sensorMain PCBHeater relaysBroil and Bake heaters

How to Fix

  1. 1

    Disconnect power and open back cover

  2. 2

    Check oven temperature sensor resistance (1080 ohms at room temperature)

  3. 3

    Check broil, bake and convection heaters for proper resistance

  4. 4

    Check relays RY202 and RY203 on Main PCB

  5. 5

    Check CN320 connector connections on Main PCB

This Error Applies To

Samsung DOP36P86DLS Series Ovens & Ranges

Service manual exact match: DOP36P86DLS

Related Error Codes

C-23

Meat probe temperature sensor is shorted

C-30

Main PCB internal temperature sensor failure

C-20

Temperature sensor open or shorted

C-d0

User control button activated continuously

C-F2

Display/touch panel communication lost

C-A2

Cooling fan motor unresponsive

C-72

Drain pump inactive or water not draining from steam chamber

C-31

Temperature safety limit exceeded

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