Compacta MK4‑M is an industrial oven control panel that houses the main microcontroller, timer circuitry and digital display. Known failure modes for this model include a dead power supply or blown fuse on the 24 V DC rail, shorted input/output lines to the temperature sensor or heating element drivers, and internal board damage from over‑voltage or moisture ingress. Begin diagnostics by verifying that the panel receives correct 24 V DC and checking all fuses; next inspect the I/O connectors for continuity and any visible burn marks; finally review any stored error codes on the display (if reachable) or perform a visual inspection of the PCB for cracked traces or swollen capacitors.[oss-gpt-20b]