Fault Codes/Rehlko/GENERATOR FREQUENCY HIGH SDRehlkoGENERATOR FREQUENCY HIGH SDUnclassifiedGeneralWhat This Code MeansExercise Not ScheduledPossible Causes•No exercise has been scheduled on the RDC2 controller.Suggested Actions1See Section 2.5 for instructions to set the exerciser.Related Rehlko Fault CodesGENERATOR FREQUENCY LOW SDGENERATOR VOLTAGEL1-L2 HIGH SDFREQUENCY LOW SD *GENERATOR VOLTAGEL1-L2 LOW SDFREQUENCY HIGH SD *HETFAULTHIGH BATTERY VOLTAGEEXER NOT SCH WHIGH ENGINE TEMPERATUREEXER NOT SCHLED4Browse all Rehlko fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for GENERATOR FREQUENCY HIGH SD on your specific Rehlko unit — cited to the OEM manual, not a forum guess.TRY IT FREE