The National Controls Corp TBC‑FC445‑010 is a solid‑state fryer controller that regulates temperature and timer functions in commercial fryers. Common failure points on this class of units include the internal power supply/transformer (e.g., E104595), heater coil degradation, and I/O relay or sensor connections. Begin troubleshooting by verifying mains voltage to the unit, inspecting the transformer primary for insulation faults, checking all input/output terminals for continuity and proper signal levels, and reviewing any displayed error codes on the panel. If power is present but control logic fails, test the main driver board (MPC‑FC445‑012) for component failures such as blown diodes or damaged capacitors.[oss-gpt-20b]