On the covered Samsung range or oven, C-30 means an electronic-control temperature sensor is invalid. First, turn the appliance off and record the code. Then: arrange control service. Photograph the display so the technician can see the exact code, and do not restart the oven repeatedly.
Try in this order
0 of 4 completedWhat to do first
ReversibleTurn the appliance off and record the code.
Correct only the documented fault domain
ReversibleArrange control service.
Let the range cool and give it ventilation
ReversibleC-30 and C-31 point at the temperature sensor on the main control board, or at the board area getting too hot. Let the range cool completely, keep the space around it ventilated and do not run large pots on back burners at high heat for long.
Power cycle
ReversibleDisconnect power at the breaker for a few minutes, then restore it. A temporary reading recovers.
Evidence ledger
Sources behind this answer
Exact questions
Common questions about “Samsung range or oven code C-30”
What does C-30 mean on a Samsung range or oven?+
An electronic-control temperature sensor is invalid.
Does C-30 mean I need a new control board?+
If it returns when the room and the range are cool, the board's own sensor is at fault and the board needs replacing by a technician.
Is the C-30 code caused by my cooking?+
It can be: long high-heat use of the back burners warms the board area and repair guides list outside heat as a cause, so let the range cool fully before you judge it.