Error code
dC
Meaning
The dryer thinks the door is open while running
Moderate
What to do
Why this happens
The issue may stem from an improperly secured door, loose or open wire terminals in the door sense circuit, or a defective door switch.
How to fix it
If it still shows the error with the door closed, the door switch likely needs replacing — a technician can do this in under an hour.
SourceSamsung service manual