Phase Rotation Error
GE
Incorrect Phase Sequence at Output or ATS
Controller displays 'Phase Rotation' or 'Phase Sequence Error' on three-phase GE standby generators.
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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
Incorrect wiring of generator output leads, Miswired ATS load or line connections, Reversed phases after service work, Faulty phase rotation sensor circuit
How to Fix / Troubleshooting
Safety First: Three-phase wiring errors can damage motors and equipment. All work should be performed by a qualified electrician. De-energize both utility and generator sources before opening panels.
- 1. Verify phase labeling: Confirm that generator output terminals are correctly labeled (L1, L2, L3) and match the wiring diagram.
- 2. Check ATS connections: In the GE ATS, ensure that line and load terminals maintain the same phase order from utility through to load and generator.
- 3. Use a phase rotation meter: With power restored (one source at a time), use a phase rotation meter to verify correct sequence at the generator and at the load side of the ATS.
- 4. Correct any reversed phases: If rotation is incorrect, swap two phases at the generator or ATS output (with power OFF) to restore proper sequence.
- 5. Clear alarm: After correcting wiring, clear the Phase Rotation Error by cycling the controller OFF then AUTO and run a test under light load.
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Repair Difficulty
Professional Required
5/5
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