The Thermo King 41‑2997 V280 controller base (part 2C26664G01) is the electronic brain of a truck‑mounted refrigeration system, handling temperature setpoints, compressor cycling and cab display functions. Common failure points for this model include burned or tripped MOSFETs on the power board, degraded capacitors in the DC‑DC converter, and loose or corroded I/O connections to the cabinet panel. Begin troubleshooting by verifying that the unit receives the correct 24 V input voltage and that all fuses are intact; then inspect the PCB for visible damage such as burn marks or swollen electrolytics. Next check the cab interface for proper signal levels and confirm that error codes (if any) match known diagnostic patterns in Thermo King’s service manual.[oss-gpt-20b]