Error Code C-21
Oven internal overheating — oven temperature reaches 650 F (343 C) in any cooking function except self-clean
Moderate
Address soon - your appliance may not work properly
What This Means
Oven temperature sensor malfunction; DLB relay stuck on; Broil relay stuck on; Bake relay stuck on; Disconnected or damaged harness linked to Main PCB
How to Fix
- 1
Disconnect power and open back cover
- 2
Measure oven sensor resistance (normal: 1080 ohm at room temperature)
- 3
Check DLB relay, Bake relay, and Broil relay on Main PCB (normal when off: infinite ohm)
- 4
Check for damaged PCB traces or pattern
- 5
Check harness connections related to oven sensor and connector CN320 on Main PCB
- 6
If no problem found after checks, replace Main PCB
- 7
If oven sensor is faulty, replace and reconnect
- 8
Repair or replace damaged harness
This Error Applies To
Samsung DOP36M96GL Series Ovens & Ranges (2019) (2019–present)
Related Error Codes
PCB sensor temperature high — onboard PCB NTC thermistor reading abnormally high temperature
Short key — short circuit detected at control interface at connector CN300 on Main PCB or Sub PCB
Door locking information — door lock motor or switch malfunction
Oven sensor open (over 2950 ohm) or oven sensor short (under 930 ohm)
PCB sensor opened or PCB sensor shorted (onboard NTC thermistor fault)
Main PCB to Sub PCB communication error