Code 14
Onan
Engine Overspeed Protection Trip
Generator shuts down; Code 14 displayed indicating over-speed condition
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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
Faulty governor actuator stuck open, Broken or disconnected throttle return spring, Failed speed sensor sending incorrect signal, Defective controller speed regulation circuit
How to Fix / Troubleshooting
Safety first: Overspeed can cause catastrophic failure. Do not repeatedly restart until the cause is identified. Disable auto-start and open the main breaker.
- Inspect throttle and governor linkage: Verify that the throttle plate returns to idle when the actuator is de-energized. Replace any broken or weak return springs. Ensure linkage is not binding.
- Check governor actuator operation: With the engine off, disconnect the actuator linkage and verify the actuator moves through its range when commanded (per service manual test). Replace if it sticks or fails to move.
- Inspect speed sensor: Check the magnetic pickup for damage, loose mounting, or incorrect gap. Tighten mounting and set gap to specification. Replace if the tip is damaged.
- Controller calibration: If mechanical components are correct, the controller may be misreading speed. A technician can verify RPM with a handheld tachometer and compare to controller readings. Replace controller if it cannot regulate speed.
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Repair Difficulty
Professional Required
5/5
Required Part
Speed Sensor (Magnetic Pickup)
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