Generac

1200

UnclassifiedCooling

What This Code Means

External display board is not able to communicate with main board; Main board does not see communication from display board; Overcrank; Low to no fuel pressure while cranking; Overspeed (Over 72 Hz for three seconds); Throttle stuck open; Overspeed (Over 75 Hz for one second); Total loss of control; High temperature (Coolant temp greater than 246 ºF (119 ºC) for 1 second); Overcrank alarm; Overspeed (Over 72 Hz for three seconds with the throttle stuck open); Overspeed (Over 75 Hz for one second with the throttle stuck open, total loss of control); Low oil pressure while running; Controller Fault A; Overspeed (Instantaneous— Over 75 Hz for 1 second)

Possible Causes

  • •Air Flow Impeded / Flow Issue
  • •Air flow impeded
  • •Broken stepper wire
  • •Check the oil level
  • •Engine/Starter Problem
  • •Flow issue
  • •Internal Error
  • •Internal Harness Loop Broken (internal to the display board)
  • •Internal harness connecting external display board to main board has become disconnected
  • •Internal harness loop broken (external display board)
  • •Low to no fuel pressure while cranking
  • •No Fuel Pressure
  • •Stepper motor/mixer body assembly issue
  • •Stuck throttle

Suggested Actions

  1. 1Because of the nature of cranking there is almost no insight into the cause of an overcrank alarm with the current sensors.
  2. 2Check coolant sensor circuit for proper operation
  3. 3Check coolant sensor circuit for proper operation.
  4. 4Check the inlet/outlet for debris
  5. 5Check the inlet/outlet for debris.
  6. 6Clear any faults in the controller before proceeding with any running diagnostic steps
  7. 7Clear any faults in the controller before proceeding with diagnostic steps
  8. 8Controller will reboot and transition to the same key state it was in before and resume operation.
  9. 9Follow procedure in Appendix B
  10. 10Fuel pressure has to be measured as low for at least 1200 ms before the overcrank alarm is set.
  11. 11Perform Test 12
  12. 12Test 12
  13. 13Test 12 – Check stepper motor control

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