Gillette Failure to Transfer Load to Generator

Generator starts and runs during outage but building does not receive power; transfer switch does not transfer.

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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

ATS mechanism jammed, ATS control circuit fault, Incorrect generator voltage or phase, Mechanical interlock failure

How to Fix / Troubleshooting

Safety first: Only qualified electricians should service an ATS. High voltage and backfeed hazards exist.

Steps:

  • Verify generator output: Confirm the Gillette generator is producing correct voltage and frequency at its terminals.
  • Check ATS status: Observe ATS position indicators (UTILITY/GEN). If stuck in UTILITY with utility absent, the mechanism or control is faulty.
  • Inspect control fuses: De-energize and open the ATS. Check control fuses and wiring to the transfer coil.
  • Mechanical inspection: Look for obstructions or damage in the transfer mechanism. Repair or replace ATS components as needed.
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Repair Difficulty

Professional Required 5/5

Required Part

Automatic Transfer Switch Mechanism
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