Generator shuts down, E09 displayed, frequency reading out of range

Safety first: Turn OFF the generator, disconnect battery negative, and ensure the throttle/governor linkage cannot move unexpectedly while you work.

• Inspect throttle linkage: On Hyundai engines with electronic or mechanical governors, check the linkage from the actuator to the fuel injection pump or carburetor. Clean any dirt or corrosion and ensure free movement.
• Check actuator connections: Inspect the governor actuator electrical connector and wiring harness for damage or loose pins. Reseat connectors.
• Fuel system check: Replace the fuel filter and verify adequate fuel supply. Fuel starvation can cause under-speed and E09.
• Controller settings: Access the Hyundai controller configuration (service level) and verify that rated frequency (50/60 Hz) and speed parameters are correctly set. Do not change advanced parameters unless you have the service manual.
• Actuator replacement: If the engine surges or cannot maintain stable speed, replace the governor actuator with a Hyundai-approved part and perform governor calibration as per the service procedure.