Fault Codes/Rehlko/AUX INPUT WARNINGRehlkoAUX INPUT WARNINGUnclassifiedGeneralWhat This Code MeansAuxiliary input faultRelated Rehlko Fault CodesBATTERYCHARGER FAULTBATTERYCHARGERFAULTAUX INPUT SHUTDWNCHKNGMETERAUXCOMMON FAULT SHUTDWNAUTO RECOVERYCOMMON WARNGATS EXERCISE NOT SCHEDULEDCONCHECKINGALOPECM ADDR ERR SHUTDWNBrowse all Rehlko fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for AUX INPUT WARNING on your specific Rehlko unit — cited to the OEM manual, not a forum guess.Your question about AUX INPUT WARNINGGET THE ANSWERFree account required — we'll bring your question with you.