Fault Codes/Rehlko/UNDERVOLTAGEL1--L2RehlkoUNDERVOLTAGEL1--L2UnclassifiedElectricalWhat This Code MeansUNDERVOLTAGEL1--L2Possible Causes•Source voltage across L1 and L2 is below the undervoltage dropout settingRelated Rehlko Fault CodesUNDERVOLTAGEL2--L3UNDERVOLTAGEL3--L1UNDERVOLTAGEVOLTAGE L1-L2 HIGHUNDERSPEEDVOLTAGE L1-L2 HIGH WARNINGUNDERFREQUENCYVOLTAGE L1-L2 LOWUL 94 HF1VOLTAGE L1-L2 LOW WARNINGUFVOLTAGEIMBALANCEBrowse all Rehlko fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for UNDERVOLTAGEL1--L2 on your specific Rehlko unit — cited to the OEM manual, not a forum guess.Your question about UNDERVOLTAGEL1--L2GET THE ANSWERFree account required — we'll bring your question with you.