Generac

F1

UnclassifiedLubrication

What This Code Means

VAC was NOT measured at Wire N1A; 240 VAC was NOT measured between the N2 lug and terminal 1 of the TR1; F3 fuse blows; SMM Load Shed Module not operating when line voltage is present; Little or no battery voltage present at Terminal Connection 87 (Wire 15) on RL1 socket; Little or no battery voltage present at Terminal Connection 86 (Wire 15A) on RL1 socket; Little or no battery voltage present at Wire 13 (when checking battery voltage at 15 amp fuse F1); Little or no battery voltage present at Wires 15, 15A, and 194 (when checking battery voltage at AUTO-OFF-MANUAL switch SW1 with switch in AUTO position); Green LED not illuminated; Green LED flashing; Green LED solid; Green LED flashing 5 seconds on and 1 second off; Configured for a GTS or 2-Wire start system; ALARM RELAY 16VAC SENSE(2); ALARM RELAY 16VAC SENSE(1); N/C SWITCH WILL BE CLOSED WHEN NORMAL FUEL PRESSURE IS PRESENT.; Utility failure; Engine running; Little or no battery voltage present at Terminal Connection 87 (Wire 15

Possible Causes

  • •Faulty or damaged Wire N1A
  • •Faulty transfer relay
  • •T1 wiring shorted to ground
  • •Faulty controller
  • •Improper contactor operation
  • •Wire 15 is pinched or cut
  • •Wire 15 is prevented from having proper battery voltage
  • •Wire 15A is pinched or cut
  • •Wire 15A is prevented from having proper battery voltage
  • •Faulty fuse holder
  • •Faulty Wire 13 between the fuse block and the terminal strip
  • •Open wire
  • •Defective AUTO-OFF-MANUAL switch
  • •AUTO-OFF-MANUAL switch in OFF position
  • •Loss of utility power
  • •Utility power available
  • •Generator awaiting power failure
  • •Generator set up for a 2-Wire start transfer switch (GTS)
  • •Dip Switch 2 in the ON position
  • •16VAC SENSE(2)

Suggested Actions

  1. 1Repair or replace Wire N1A
  2. 2Replace transfer relay
  3. 3Replace the controller (if DMM indicates infinity during T1 wiring test)
  4. 4Repair or replace the wiring in the appropriate circuit (if DMM indicates continuity during T1 wiring test)
  5. 5Verify that Wire 15 is not pinched or cut or in any other way prevented from having proper battery voltage.
  6. 6Verify that Wire 15A is not pinched or cut or in any other way prevented from having proper battery voltage.
  7. 7Check the fuse holder
  8. 8Repair or replace Wire 13 between the fuse block and the terminal strip
  9. 9Troubleshoot open wire
  10. 10Troubleshoot defective AUTO-OFF-MANUAL switch
  11. 11Place AUTO-OFF-MANUAL switch in AUTO position
  12. 12Refer back to flow chart
  13. 13Switch Dip Switch 2 to the OFF position
  14. 14Remove F1 (15 amp Fuse) for 10 seconds and re-insert
  15. 15Verify that Wire 15 is not pinched, cut, or in any other condition that would not allow voltage to be present on Wire 15.
  16. 16Identify the shorted wire when the breaker trips
  17. 17Inspect harness connections
  18. 18Inspect incoming wires
  19. 19Locate and repair the short
  20. 20Replace the Air/Fuel Solenoid (if breaker did not trip or fuse did not blow)

Related Generac Fault Codes

F3F4E-CODEF5BATTERY CHARGER AC FAILURE ALARMHIGH-BACKPRESSURE ALARM4204LOW OIL PRESSURE4200P01340035033217
Browse all Generac fault codes

ASK RUDY ABOUT THIS FAULT

Get a diagnosis walkthrough for F1 on your specific Generac unit — cited to the OEM manual, not a forum guess.

TRY IT FREE