The Start button was pressed without the appliance door being opened beforehand.
The appliance checks whether the door was opened in the 20 minutes before the Start button was pressed.
If the door has not been opened, the microwave oven will not start because the oven compartment may be empty and door will appear in the display.
Operating the microwave oven without food may cause damage to the appliance.
The appliance door must be opened briefly for a program to start.
