Yamaha
Transfer Switch Power Transfer Failure
Generator starts and runs during outages but the transfer switch does not transfer load to the generator.
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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
Mechanical binding in ATS mechanism, Failed ATS coil or motor, Control logic fault in ATS, Incorrect wiring of generator sensing circuits
How to Fix / Troubleshooting
Safety first: Only qualified persons should open and service an ATS. Turn OFF all power sources and verify absence of voltage with a meter before working inside.
- Observe ATS status: Check indicator lights or display on the ATS to see if it recognizes generator availability.
- Inspect mechanism: With power off, manually operate the transfer mechanism (if design allows) to check for binding. Lubricate pivot points per manufacturer instructions.
- Test transfer coil/motor: Measure coil resistance and verify it receives the correct control voltage during a transfer command. Replace if open or not operating.
- Verify sensing wiring: Ensure generator voltage sensing leads are correctly connected to the ATS controller.
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Repair Difficulty
Professional Required
5/5
Required Part
Automatic Transfer Switch Mechanism
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