F13
MTU Onsite Energy
Generator Underfrequency
Controller displays F13 – Underfrequency alarm/shutdown
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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
Engine underspeed due to overload, Fuel restriction, Governor misadjustment, Faulty speed sensor
How to Fix / Troubleshooting
Safety first: Remove load from the generator before troubleshooting frequency issues.
- Confirm frequency: Measure output frequency with a meter to verify underfrequency.
- Check load level: Compare connected load to the generator’s rated kW. If overloaded, reduce load to within rating.
- Inspect fuel system: Check fuel filters, lines, and tank vents for restrictions. Replace clogged filters and clear obstructions.
- Governor tuning: Verify governor speed and droop settings in the MTU controller. Adjust according to the service manual.
- Speed sensor check: Inspect and test the speed sensor and wiring for intermittent signals.
- Re-test: Clear the F13 alarm and run the generator under normal load, confirming stable frequency.
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Repair Difficulty
Medium
3/5
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