Eaton Transient Voltage Sag / Load Step Response

Lights flicker or dim noticeably when large loads start while on generator power.

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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

Generator sized too small for motor starting currents, Weak engine response due to fuel or governor issues, Loose neutral or phase connections, AVR response too slow or faulty

How to Fix / Troubleshooting

Safety first: Avoid starting all large loads simultaneously on generator power.

Steps:

  • Load management: Stagger the startup of large motors (AC compressors, well pumps) and consider installing Eaton load-shedding modules if available.
  • Check connections: Tighten neutral and phase conductors at the generator, ATS, and main panel.
  • Engine tune-up: Ensure air filter, spark plugs, and fuel supply are in good condition so the engine can respond quickly to load changes.
  • AVR evaluation: If sags are severe and persistent, have a technician test and possibly replace the AVR.
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Repair Difficulty

Medium 3/5

Required Part

Automatic Voltage Regulator
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