Samsung MR-DH00 Technical Data Book page 23

5) Display
E
rror display
displayed in the LCD display.
LCD Display
When an Error Occurs in Your Indoor/Outdoor Units (Product Group Display : A20)
Example : Error 121 occurred in indoor unit with main address no. 18 (decimal numbers).
Refers to the indoor unit
When an Error Occurs in Your Ventilator(ERV) (Product Group Display : B30)
Example : Error 121 occurred in indoor unit with main address no. 18 (decimal numbers).
Refers to the ERV unit
When an Error Occurs in Your Wired Remote Controller
Only an error code will be displayed. (No address will be displayed.)
Example : Error 601 has occurred at your Wired Remote Controller.
Outdoor unit address Indoor unit Main address
(Displayed in hexadecimal)
(Displayed in hexadecimal)
ERV unit Main address
(Displayed in hexadecimal)
Error code
Error code
23