F16
MTU Onsite Energy
High Engine Oil Temperature
Controller displays F16 – Oil temperature high 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
Insufficient oil cooling, Blocked oil cooler, Low oil level, Faulty oil temperature sensor
How to Fix / Troubleshooting
Safety first: Allow the engine to cool before touching oil system components.
- Check oil level: Verify oil level on the dipstick and top up with MTU-approved oil if needed.
- Inspect oil cooler: Check the engine oil cooler (air or water-cooled) for blockages, dirt, or restricted coolant flow.
- Verify coolant system: Ensure the engine cooling system is functioning properly, as poor coolant flow can raise oil temperature.
- Sensor check: Compare controller oil temperature reading with an external measurement at the oil gallery. Replace the oil temperature sensor if readings are inaccurate.
- Test run: Clear the F16 alarm and run the generator while monitoring oil temperature. Persistent high temperature requires professional diagnosis.
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Repair Difficulty
Medium
3/5
Required Part
Oil Temperature Sensor
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