Code 47
Onan
Fuel Shutoff Solenoid Circuit Failure
Generator shuts down; Code 47 displayed indicating fuel solenoid circuit fault
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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 or shorted fuel solenoid coil, Broken solenoid wiring, Blown DC fuse feeding solenoid, Failed controller solenoid driver
How to Fix / Troubleshooting
Safety first: Disable auto-start and disconnect battery negative before working on the solenoid wiring.
- Listen for solenoid operation: When turning the key or start command on, listen for a click at the fuel solenoid. No click suggests a problem.
- Check fuses: Inspect DC control fuses in the generator control box. Replace any blown fuses with the correct rating and investigate cause.
- Test solenoid coil: Disconnect the solenoid and measure coil resistance. An open or very low reading indicates a bad solenoid—replace it.
- Inspect wiring: Check harness from controller to solenoid for damage. Repair as needed.
- Controller driver: If the solenoid and wiring are good but no voltage is supplied, the controller output may be faulty and require replacement.
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Repair Difficulty
Medium
3/5
Required Part
Fuel Shutoff Solenoid
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