Fault Codes/Rehlko/—1—Rehlko—1—UnclassifiedGeneralWhat This Code MeansLoss of communication with the equipment controllerPossible Causes•Communication failure between monitor and equipment controllerSuggested Actions1Press the alarm silence button three times to check for successful communicationRelated Rehlko Fault Codes0X00013SRCSYSTEMDISABLE12263535A3638394040A41Browse all Rehlko fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for —1— on your specific Rehlko unit — cited to the OEM manual, not a forum guess.Your question about —1—GET THE ANSWERFree account required — we'll bring your question with you.