Fault Codes/Rehlko/BATTERY BACKUP LOW WARNINGRehlkoBATTERY BACKUP LOW WARNINGUnclassifiedElectricalWhat This Code MeansBattery Backup Low WarningPossible Causes•The ATS backup battery voltage is lowSuggested Actions1Replace the battery on the main logic board2See Section 4.3.3Related Rehlko Fault CodesBATTERY CRLOBATTERY CRLO WARNING WBATTERY BACKUP LOWBATTERY HIGHBATT CHG FLT WARNINGBATTERY HIGH WBATT CHG FLT WBATTERY HIGH WARNINGALT PROTECT SHUTDWNBATTERY LOW WARNINGAGS-10BATTERY VOLTAGE HIGH WBrowse all Rehlko fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for BATTERY BACKUP LOW WARNING on your specific Rehlko unit — cited to the OEM manual, not a forum guess.Your question about BATTERY BACKUP LOW WARNINGGET THE ANSWERFree account required — we'll bring your question with you.