Onan
Inadequate Ventilation / Cooling Airflow Restriction
Generator enclosure becomes excessively hot, components show heat discoloration
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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 air intake or exhaust louvers, Failed cooling fan, Debris buildup around radiator or alternator, Improper installation clearance
How to Fix / Troubleshooting
Safety first: Allow the unit to cool before touching enclosure or internal components. Disable auto-start.
- Clear vents: Remove leaves, dust, and debris from intake and exhaust louvers on the enclosure.
- Inspect fan operation: Verify that the engine-driven or electric cooling fan operates when the generator runs. Replace failed fans or belts.
- Clean radiator and alternator: Blow out dust and debris from radiator fins and alternator cooling passages with low-pressure air.
- Check installation clearances: Ensure the generator has the minimum clearances specified by Onan on all sides for proper airflow.
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Repair Difficulty
Medium
3/5
Required Part
Cooling Fan Assembly
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