The Samsung CQ138SC Oven has some known problems that occur often. Here are some easy to do solutions for the problems or error codes your Samsung might be giving you.
The temperature sensor reads more than 250 °C during operation or cancellation.
The temperature sensor reads less than 5 °C during operation or cancellation.
The microwave oven temperature exceeds 230 °C during operation, indicating a fire hazard.
The damper fails to open or close within one minute.