Hyundai Power
Hunting / Surging Start-Stop Cycle
Generator starts and stops repeatedly in short cycles without stabilizing; no specific error code.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Unstable fuel supply pressure, Faulty Hyundai Power controller start/stop logic, Loose engine speed sensor connection, Intermittent safety switch
How to Fix / Troubleshooting
Safety first: Place the generator in OFF to stop the cycling before troubleshooting.
- Check fuel supply stability: For gas units, verify that gas pressure remains within spec during start attempts. For liquid fuel, ensure the tank is adequately filled and lines are not sucking air.
- Inspect safety switches: Wiggle connectors at the oil pressure switch, coolant temp sensor, and emergency stop while monitoring continuity. Replace any intermittent switches.
- Speed sensor wiring: Ensure the engine speed sensor connector is secure. Intermittent RPM signal can cause the controller to shut down and restart.
- Controller configuration: Review start/stop parameters (crank time, rest time, number of attempts) in the Hyundai Power controller and reset to factory defaults if misconfigured.
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Repair Difficulty
Hard
4/5
Required Part
Engine Speed Sensor
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