Hyundai Power Products
ATS Fails to Transfer Load
Generator is running but building power is not being supplied (no transfer), no error code on controller
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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
Stuck or failed ATS contactor, ATS control circuit fault, Mechanical interlock jammed, Incorrect ATS wiring
How to Fix / Troubleshooting
Safety first: Isolate both mains and generator sources before opening the ATS. Only qualified electricians should service ATS equipment.
- Visual inspection: Open the Hyundai-compatible ATS enclosure and inspect the contactor mechanism for signs of burning or mechanical damage.
- Manual operation: If the ATS has a manual operating handle, attempt to move it through its positions with power isolated. If it binds, the mechanism may be jammed and require replacement.
- Control voltage: With appropriate safety measures, verify that the ATS coil receives the correct control voltage from the generator controller when transfer is commanded.
- Repair or replace: Replace the ATS contactor or control board if they fail to operate with correct signals. Confirm wiring matches the Hyundai wiring diagram.
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Repair Difficulty
Professional Required
5/5
Required Part
Automatic Transfer Switch Contactor
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