The Samsung C138STF 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 'E3' message is automatically activated prior to the microwave oven overheating.
This message indicates the low scroll speed setting.
This message indicates the high scroll speed setting.
The oven is locked and cannot be used for cooking.
The oven is unlocked and ready for normal operation.