E15
A-iPower
Transfer Switch Communication Fault
A-iPower standby generator shows E15 and refuses to transfer load even though it is running.
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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
Broken communication cable between generator and ATS, Incorrect ATS wiring, Faulty ATS control board, Controller configuration mismatch
How to Fix / Troubleshooting
Safety first: Open the main utility and generator breakers before opening the automatic transfer switch (ATS). Only qualified persons should work inside an ATS.
- Inspect communication cable: Locate the low-voltage communication cable (often multi-conductor) between the generator controller and the A-iPower ATS. Check for physical damage, rodent chewing, or loose connectors.
- Verify terminations: Ensure wires are landed on the correct terminals as per the A-iPower wiring diagram. Tighten any loose screws.
- Check ATS control fuse: Inside the ATS, inspect low-voltage control fuses and replace any blown fuses with the correct rating.
- Controller settings: Confirm that the generator controller is configured for the installed ATS type and communication protocol.
- If E15 persists: The ATS control board or generator controller may require replacement. Contact an A-iPower-authorized service provider.
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Repair Difficulty
Professional Required
5/5
Required Part
Automatic Transfer Switch Control Board
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