PHASE IMBALANCE
Gillette
AC Output Phase Voltage Imbalance
Controller indicates PHASE IMBALANCE or VOLTAGE IMBALANCE; generator remains running but alarm is active.
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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
Uneven load distribution across phases, Loose connection on one phase, Faulty alternator winding
How to Fix / Troubleshooting
Safety first: Use proper PPE when working in live panels. If unsure, contact a licensed electrician.
Steps:
- Measure phase voltages: With the Gillette generator running and supplying load, measure L1-L2, L2-L3, and L3-L1 voltages. A difference greater than ~2–3% indicates imbalance.
- Inspect connections: Turn OFF the generator and open the output terminal box. Tighten all phase and neutral lugs. Look for discoloration or melted insulation on one phase.
- Rebalance loads: At the building distribution panel, redistribute single-phase loads more evenly across the three phases to reduce imbalance.
- Alternator check: If imbalance persists with no load, suspect a damaged alternator winding. This requires professional testing and likely alternator repair or replacement.
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Repair Difficulty
Hard
4/5
Required Part
Alternator Stator
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