E11
Aksa
Incorrect Phase Rotation
Generator shuts down; controller shows E11 Phase Sequence / Reverse Phase.
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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 connection at ATS, Miswired alternator output leads, CT polarity reversed causing false detection
How to Fix / Troubleshooting
Safety first: De‑energize both generator and utility before opening any power terminals.
- Verify phase rotation: Use a phase rotation meter at the generator output terminals and at the ATS load side. Both should match the required sequence (e.g., L1‑L2‑L3).
- Check wiring at alternator terminals: Confirm that U‑V‑W (or L1‑L2‑L3) from the Aksa alternator are correctly landed on the generator breaker and ATS.
- Inspect CT polarity: Ensure CTs are installed with correct orientation (P1 toward source) and that S1/S2 are wired correctly to the controller.
- Correct wiring errors: Swap two phases at the generator breaker or ATS if rotation is wrong. Tighten all lugs to specified torque.
- Reset and test: Clear the E11 alarm and run the generator on load while monitoring for any further phase sequence alarms.
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Repair Difficulty
Medium
3/5
Required Part
Automatic Transfer Switch (ATS) Wiring
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