A-iPower
Failure to Transfer Load
Generator starts and runs, but the automatic transfer switch does not transfer the building load to 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
ATS sensing generator voltage incorrectly, Mechanical failure in ATS contactor, Interlock or safety switch engaged, Loose control wiring between generator and ATS
How to Fix / Troubleshooting
Safety first: Only qualified electricians should open and work inside an ATS. High voltage is present.
- Verify generator voltage: Confirm that the generator is producing correct voltage and frequency at its terminals.
- Check ATS status indicators: Many A-iPower ATS units have LEDs or indicators showing source availability and contactor position. Use these to narrow down the issue.
- Inspect control wiring: Ensure all low-voltage control wires between the generator and ATS are secure and correctly terminated.
- Manual operation test: If the ATS has a manual transfer mechanism, test it (with both sources off) to ensure the contactor moves freely.
- If ATS fails to operate electrically: The ATS coil or control board may be defective and require replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Automatic Transfer Switch Contactor
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