AL25
SDMO
Alternator Overtemperature
Controller displays AL25 indicating alternator temperature high.
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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
Blocked alternator ventilation, Overload on SDMO alternator, Faulty alternator temperature sensor, High ambient temperature with inadequate cooling airflow
How to Fix / Troubleshooting
Safety first: Isolate the generator from load and allow the alternator to cool before inspection.
- Check ventilation: Ensure that the alternator cooling air path is clear. Remove dust and debris from air inlets and the alternator housing.
- Review load profile: Confirm that the generator is not consistently overloaded. Reduce load or redistribute circuits if necessary.
- Inspect temperature sensor: Locate the alternator temperature sensor and check wiring. Test sensor resistance vs. temperature and replace if faulty.
- Improve ambient conditions: Verify that the SDMO generator room or enclosure has adequate ventilation and that extraction fans are working.
- Reset AL25: After addressing the cause, clear the alarm and monitor alternator temperature during operation.
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Repair Difficulty
Medium
3/5
Required Part
Alternator Temperature Sensor
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