The Wohrle DM‑12/SK2L/CP/200 is an industrial operator panel that combines a display, keypad and I/O interface for motor drives or PLC systems. Common failures on this model include a dead or flickering LCD due to a burnt backlight driver, a stuck or non‑responsive keypad from worn contacts, and loss of communication when the serial or CAN bus transceiver fails or its firmware corrupts. Other generic issues in similar control panels are power supply board faults (over‑voltage on the 12 V rail), damaged signal traces, and overheating of the main controller IC.

First‑check diagnostics: verify that the panel receives correct input voltage (24 VAC/48 VDC as specified) and that the internal regulator outputs stable 5 V/12 V rails; inspect the LCD backlight driver and keypad contacts for burn marks or corrosion; read any error codes from the panel’s diagnostic LEDs or serial log to pinpoint a communication or firmware fault.[oss-gpt-20b]