Fault Codes/Rehlko/3SRCSYSTEMDISABLERehlko3SRCSYSTEMDISABLEUnclassifiedGeneralWhat This Code Means3SRCSYSTEMDISABLEPossible Causes•A 3-Source System Disable input signal is activeRelated Rehlko Fault Codes12260X000135—1—35A3638394040A41Browse all Rehlko fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for 3SRCSYSTEMDISABLE on your specific Rehlko unit — cited to the OEM manual, not a forum guess.Your question about 3SRCSYSTEMDISABLEGET THE ANSWERFree account required — we'll bring your question with you.