Samsung RF18A Series Service Manual page 64

This document cannot be used without Samsung's authorization.
CHECK THE INSTALLATION STATUS
1) TEST Mode Entering
Enter the
Engineer Mode
①
③
②
'<'+ '>' Key are pressed simultaneously for 6 seconds.
And the Control Display will blink with an interval of 0.5 seconds.
In that case, you may take your fingers off both buttons and press the '>' button to enter the Engineer Mode.
After entering Engineer Mode, press the '<' or '>' key to make the number '1' blinks.
Then, press the 'O' button to enter the Test Mode.
64