E16
Ryobi
Transfer Switch Communication Fault
Ryobi standby generator controller displays E16 and the unit will not transfer load.
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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
Open communication cable between generator and ATS, Incorrect wiring of ATS control terminals, Faulty ATS control board, Controller configuration mismatch
How to Fix / Troubleshooting
Safety first: Turn the generator OFF and disable AUTO. Turn off power to the ATS according to the installation manual. Only qualified persons should open the ATS cabinet.
- Inspect communication cable: Trace the low‑voltage communication cable from the generator controller to the automatic transfer switch. Look for cuts, pinches, or rodent damage. Ensure connectors are fully seated at both ends.
- Verify terminal connections: Inside the ATS (power off), confirm that the control wires are landed on the correct terminals as per the Ryobi wiring diagram. Tighten any loose screws.
- Check for water intrusion: Look for signs of moisture or corrosion inside the ATS and at the generator control panel. Dry and correct any sealing issues.
- Controller settings: Verify that the generator controller is configured for the correct type of ATS. Incorrect settings can cause communication errors.
- Professional service: If wiring and configuration are correct and E16 persists, the ATS control board or generator controller may need replacement by a technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Automatic Transfer Switch Control Board
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