E023
Atlas Copco
Synchronization Failure
Controller shows E023 Generator–Mains Sync Error during automatic transfer
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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 sync parameters, Faulty sync check relay, Mismatched voltage or frequency between generator and mains, Phase angle outside limits
How to Fix / Troubleshooting
Safety first: Synchronizing two power sources is hazardous if done incorrectly. Only trained personnel should adjust sync settings.
- Verify generator settings: Confirm the generator voltage and frequency are set to match the mains supply.
- Check sync parameters: In the controller, review allowable voltage, frequency, and phase angle windows for synchronization. Adjust to manufacturer‑recommended values.
- Inspect sync check relay: If a separate relay is used, verify wiring and operation per the schematic.
- Measure phase angle: Using appropriate instruments, confirm that the generator can reach acceptable phase alignment with mains during the sync attempt.
If E023 persists, a specialist should review the synchronization scheme and controller configuration.
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Repair Difficulty
Professional Required
5/5
Required Part
Sync Check Relay
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