Fault Codes/Rehlko/ADC-RESRehlkoADC-RESUnclassifiedElectricalWhat This Code MeansAlarm sounds when the battery voltage returns to an acceptable levelPossible Causes•Low battery voltage•Battery condition issues•Battery charger operation issuesSuggested Actions1Check the battery rating and condition2Check the battery charger operation3Charge or replace the batteryRelated Rehlko Fault CodesAGS-10BATTERY CRLOAC SENS LOSSBATTERY HIGHA-336415-ABATTERY VOLTAGE HIGH W516370 3BATTERY VOLTAGE LOW W516369 31BUSDEADLIVE516369 11CFGMODELNUMBrowse all Rehlko fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for ADC-RES on your specific Rehlko unit — cited to the OEM manual, not a forum guess.TRY IT FREE