Error code
C-20
Meaning
Oven sensor open (over 2950 ohm) or oven sensor short (under 930 ohm)
Moderate
What to do
Why this happens
Possible causes include an open circuit or shorted oven temperature sensor, damage to the wire harness between the sensor and Main PCB, or issues with the Faulty Main at connector CN320.
SourceSamsung service manual