E029
Atlas Copco
Breaker / ATS Position Feedback Error
Controller shows E029 ATS Feedback Fault / Breaker Position Mismatch
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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
Faulty auxiliary contacts on breaker, Miswired ATS feedback signals, Stuck breaker mechanism, Controller logic misconfiguration
How to Fix / Troubleshooting
Safety first: Work on breakers and ATS only with all sources isolated and locked out. Mechanical interlocks must be respected.
- Check actual positions: Verify physically whether the generator and mains breakers or ATS contactors are open or closed.
- Inspect aux contacts: Locate the auxiliary contacts that report breaker status to the controller. Test continuity in open and closed positions and replace if faulty.
- Verify wiring: Compare feedback wiring to the Atlas Copco schematic to ensure the correct signals are connected to the controller inputs.
- Review controller logic: Confirm that the controller is programmed for the correct type of ATS/breaker scheme.
Correct feedback is essential for safe automatic operation; resolve E029 before returning to service.
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Repair Difficulty
Hard
4/5
Required Part
Breaker Auxiliary Contact Block
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