Westinghouse
Unstable Voltage / AVR or Engine Speed Instability
Generator runs and transfers, but house lights flicker and voltage fluctuates
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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
Failing automatic voltage regulator, loose alternator connections, worn brushes, unstable governor adjustment, fluctuating gas pressure
How to Fix / Troubleshooting
Safety first: Set the generator to OFF and open the main AC breaker before opening any covers. Voltage testing should be done by a qualified person.
- Inspect alternator terminals: Tighten all main output and sensing connections at the alternator and terminal block.
- Check AVR harness: Ensure the AVR plug is fully seated and wires are not damaged.
- Verify engine speed stability: A technician should monitor frequency (Hz) under load. Large swings indicate a governor or fuel supply issue.
- Replace AVR if indicated: If engine speed is stable but voltage still fluctuates, replace the AVR with a Westinghouse-compatible unit.
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Repair Difficulty
Hard
4/5
Required Part
Automatic Voltage Regulator (AVR)
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