The TH-MSUR-40 is self-diagnosing. According to the manual, these are the most common error messages:
: The screen includes a backlight for easier use in dark rooms. Accessing the Full Manual control universal articco th-msur-40 manual
Sometimes the volume works but the input button doesn't. This usually means you’re on a "close" code but not the one. Try the next code in the sequence for your brand. Why We Love the Articco Series The TH-MSUR-40 is self-diagnosing