Sevcon Millipak 633C23502 is a motor controller used in industrial hydraulic or forklift applications to regulate pump speed and torque. Common failure modes for this class of units include power supply over‑voltage damage, overheating of the main MOSFET array, and degradation of the control board’s I/O circuitry due to vibration or moisture ingress. First‑check diagnostics should verify that the input voltage is within spec and that the controller’s internal temperature sensor reports normal operating temperatures; next inspect all connector pins for corrosion or loose contacts; finally review any fault codes displayed on the panel or logged in the controller’s diagnostic memory.[oss-gpt-20b]