Field Sense Loss
Honeywell
Loss of alternator field or AC output sensing
Controller displays 'Field Sense Loss' or 'Loss of AC Sensing'; generator may run but not produce power.
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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 field winding circuit, Failed voltage regulator, Broken AC sensing wires to controller, Blown alternator fuse (if equipped)
How to Fix / Troubleshooting
Safety first: Isolate the generator from the load by opening the main breaker. Turn OFF the unit and disconnect battery negative before opening the alternator compartment.
Steps:
- Inspect field wiring: Locate the two smaller field wires from the AVR to the alternator rotor. Check for loose or burnt connections.
- Check AC sensing leads: Follow the small gauge wires from the alternator output to the controller. Tighten any loose terminals and repair damaged wires.
- Fuse check: Some Honeywell alternators include an inline fuse for field or sensing circuits. Test and replace if blown.
- AVR test: If wiring and fuses are intact, the AVR may not be energizing the field. Replace the AVR with the correct Honeywell part and retest.
- Alternator test: If Field Sense Loss persists, the rotor or stator may be open and require professional bench testing.
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Repair Difficulty
Professional Required
5/5
Required Part
Voltage Regulator (AVR)
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