E11
Winco
Phase Loss / Phase Imbalance Fault
Controller shows E11 / PHASE LOSS or PHASE IMBALANCE on three-phase Winco standby 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
Open phase in generator stator winding, Loose phase conductor in terminal block, Faulty transfer switch contact on one phase, Blown line fuse (if equipped)
How to Fix / Troubleshooting
Safety first: Open all breakers and lock out/tag out. Three-phase systems carry lethal voltages.
- Visual inspection: With power off, inspect the generator terminal block and transfer switch lugs for loose or burned connections on any phase.
- Check fuses and breakers: If the system uses line fuses, test each with a meter and replace any open fuses with the correct rating.
- Measure phase voltages: Have a qualified person measure voltage between all phase pairs and to neutral. A missing or low phase indicates a stator or connection issue.
Phase loss often requires stator or transfer switch repair by a professional. Do not operate with a missing phase.
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Repair Difficulty
Professional Required
5/5
Required Part
Stator Assembly
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