The Samsung CM1929 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.
HVT-II Power Error: The circuitry inside the oven is not working correctly.
EEPROM Error: Memory IC (EEPROM IC) is not working correctly.
HVT-I Power Error: The circuitry inside the oven is not working correctly.
Power frequency Error: Power frequency is other than 50 Hz.