F26
MTU Onsite Energy
Low Coolant Level Detection
Controller displays F26 – Coolant level low alarm
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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
Coolant leak in hoses or radiator, Faulty coolant level sensor, Air trapped in cooling system, Loose hose clamps
How to Fix / Troubleshooting
Safety first: Allow the engine to cool before opening the cooling system. Hot coolant is dangerous.
- Check coolant level: Inspect the expansion tank and top up with the correct coolant mixture if low.
- Inspect for leaks: Examine hoses, clamps, radiator, and engine block connections for signs of leakage. Tighten clamps and replace damaged hoses.
- Bleed air: Follow MTU procedures to bleed air from the cooling system after refilling.
- Level sensor check: Test the coolant level sensor operation and wiring. Replace the sensor if it gives false low-level alarms.
- Re-test: Clear the F26 alarm and run the generator while monitoring coolant level and temperature.
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Repair Difficulty
Medium
3/5
Required Part
Coolant Level Sensor
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