MTU Onsite Energy
Automatic Start Inhibit
Generator runs in manual but will not start in automatic mode
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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
Auto mode not selected on controller, Active inhibit input (e.g., remote stop), Incorrect auto start configuration, Faulty remote start wiring
How to Fix / Troubleshooting
Safety first: Inform site personnel before enabling automatic operation to avoid unexpected starts.
- Mode selection: Ensure the MTU controller is set to AUTO mode, not MANUAL or OFF.
- Check inhibit inputs: Review controller status for any active remote stop, E-stop, or maintenance mode inputs and clear them.
- Remote start circuit: Verify continuity and correct wiring of the remote start contacts from the ATS or BMS.
- Controller configuration: Confirm that auto start logic is enabled and correctly configured in the controller parameters.
- Test automatic start: Simulate a start signal (e.g., utility fail) and observe whether the generator starts automatically.
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Repair Difficulty
Medium
3/5
Required Part
Generator Control Module
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