Controller displays F30 – Generator bearing temperature high alarm

Safety first: Allow the generator to cool before touching bearing housings. Lock out the system.

• Check temperature: Use an infrared thermometer to verify bearing housing temperature and compare with controller readings.
• Inspect lubrication: For grease-lubricated bearings, check for signs of dried or contaminated grease. Re-lubricate according to MTU guidelines if applicable.
• Alignment check: Inspect coupling alignment between engine and generator. Misalignment can cause bearing overheating and should be corrected by qualified personnel.
• Sensor verification: Test the bearing temperature sensor and wiring. Replace if it is giving false high readings.
• Professional service: If actual bearing temperature is high, schedule bearing inspection or replacement to prevent catastrophic failure.