E25
Aksa
Utility Sensing Fault
Generator shuts down; controller displays E25 Mains Failure Input Error (for standby with ATS).
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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 mains voltage sensing wiring, Blown fuses on sensing lines, Wrong mains parameters in controller, Faulty ATS feedback contacts
How to Fix / Troubleshooting
Safety first: De‑energize both mains and generator before working on sensing circuits.
- Check mains sensing fuses: In the Aksa control panel, locate and test fuses feeding the controller's mains sensing inputs. Replace blown fuses with correct rating.
- Verify wiring: Confirm that each phase and neutral from the mains is correctly wired to the controller sensing terminals.
- Controller settings: Ensure nominal mains voltage and frequency are correctly programmed.
- ATS feedback: Check auxiliary contacts on the ATS that indicate mains/generator position. Repair or replace faulty contacts.
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Repair Difficulty
Medium
3/5
Required Part
Mains Sensing Fuse Block
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