F2

UnclassifiedCooling

What This Code Means

Field Overload; Speed Sense Fault; Controller does not sense quadrature frequency and voltage; External Coolant Loss; Coolant in oil; Engine Unstable; Genset Hunts; Genset Surges

Possible Causes

  • Cracked or leaking hoses
  • Excessive load
  • Fuel lines leaking
  • Leaks or defects in radiator
  • Loose clamps
  • Loose wiring connections
  • Open, short, or ground in rotor/stator windings

Suggested Actions

  1. 1Check F2 Fuse
  2. 2Check K2 relay and connections
  3. 3Check control
  4. 4Check for leaking fuel lines
  5. 5Check for loose wiring connections
  6. 6Check fuel supply
  7. 7Check loads for proper operation
  8. 8Check rotor/stator windings for opens/shorts/grounds
  9. 9Check starter circuits
  10. 10Operate and check for leaks
  11. 11Pressure test coolant system
  12. 12Visually check coolant level
  13. 13Visually check for coolant in oil
  14. 14Visually check for cracked or leaking hoses
  15. 15Visually check for leaks or defects in radiator
  16. 16Visually check for loose clamps

ASK RUDY ABOUT THIS FAULT

Get a diagnosis walkthrough for F2 on your specific Onan unit — cited to the OEM manual, not a forum guess.

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