Generac

2502

UnclassifiedElectrical

What This Code Means

Generator running underspeed for > 30 seconds when undervoltage alarm set; Single Zero Cross missing; Undervoltage due to faulty excitation winding, or zero cross circuit, or circuit in general; One zero cross missing for greater than 1.5 seconds; Field Current measured value is above threshold; The controller fuse is missing or damaged in such a way that it does not work; Fuse problem must be detected for 1.5 seconds; Command and position feedback not matching or taking too much time to achieve; Governor in open position for greater than one second; Governor in closed position (commanded otherwise) for greater than one second; No message received for 1 second on CAN bus during startup; 12/24V Battery Type system mismatch; No response from I/O Extender 1 for 3 seconds; No response from I/O Extender 2 for 3 seconds; No response from I/O Extender 3 for 3 seconds; No response from I/O Extender 4 for 3 seconds; External Charger Fail digital input is True for 3 seconds while External Charge

Possible Causes

  • •governor wire loose
  • •governor module
  • •fuel supply/control system
  • •engine intake exhaust or mechanical issues
  • •field boost hardware failure
  • •overload
  • •Missing / Damaged Fuse
  • •faulty excitation winding
  • •zero cross circuit
  • •circuit in general
  • •Firmware older than V1.30
  • •Governor wire loose
  • •Governor module
  • •Problem with CAN bus interface
  • •Dealer Config and the Digital Input for confirming a 12/24 V Battery Type system mismatch
  • •Loss of communication with I/O Extender 1
  • •Loss of communication with I/O Extender 2
  • •Loss of communication with I/O Extender 3
  • •Loss of communication with I/O Extender 4
  • •External Charger Failure

Suggested Actions

  1. 1Test 68
  2. 2Procedure for Alarm E-Code 1905
  3. 3Procedure for Alarm E-Code 1916
  4. 4Remove Load
  5. 5Procedure for Alarm E-Code 2101
  6. 6Procedure for Alarm E-Code 2400
  7. 7Procedure for Alarm E-Code 2500
  8. 8Procedure for Alarm E-Code 2501
  9. 9Procedure for Alarm E-Code 2502
  10. 10Test 68 – Check Actuator and Mixer Function page 163
  11. 11Test 106 – Test CAN bus Communication page 174
  12. 12Confirm battery type settings
  13. 13Inspect RS-485 wiring/terminating jumper on I/O
  14. 14Confirm external charger settings on controller menu
  15. 15Check external battery charger
  16. 16Check Fuel Level

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