ATS COMM FAIL
Gillette
Communication Loss with Automatic Transfer Switch
Controller shows ATS COMM FAIL or TRANSFER SWITCH COMM ERROR; automatic transfer may not occur.
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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 communication settings, Failed ATS communication module
How to Fix / Troubleshooting
Safety first: Work with power off to the ATS control circuits when possible. Only qualified personnel should open the ATS.
Steps:
- Check communication cable: Trace the communication cable (often shielded twisted pair) from the Gillette generator controller to the ATS. Look for cuts, crushed sections, or loose terminations.
- Verify terminations: Tighten communication terminals at both ends and ensure polarity (A/B) is correct.
- Settings: In the generator controller menu, confirm that ATS communication is enabled and protocol/baud rate match the ATS requirements.
- Module replacement: If wiring and settings are correct but communication is still lost, the ATS communication module or generator controller port may be faulty and require replacement.
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Repair Difficulty
Hard
4/5
Required Part
ATS Communication Module
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