Fault Codes/Rehlko/EXTERNAL FAULT (REMOTE COMMON ALARM)RehlkoEXTERNAL FAULT (REMOTE COMMON ALARM)UnclassifiedGeneralWhat This Code MeansSelf-Resetting FaultPossible Causes•The input contact assigned to the remote common alarm input function is closedRelated Rehlko Fault CodesEXTERNALFAULTEXTERNALFAULT (REMOTECOMMONALARM)EXTERNAL FAULTEXTERNALFAULT(REMOTECOMMON ALARM)EXER NOT SCH WFAIL TO ACQUIRE PREFERRED SOURCEEXER NOT SCHFAIL TO ACQUIRE STANDBY SOURCEESFAIL TO SYNCERRATICSIG SHUTDOWN CURRENT METERINGFAILTOACQUIREPREFBrowse all Rehlko fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for EXTERNAL FAULT (REMOTE COMMON ALARM) on your specific Rehlko unit — cited to the OEM manual, not a forum guess.Your question about EXTERNAL FAULT (REMOTE COMMON ALARM)GET THE ANSWERFree account required — we'll bring your question with you.