Fault Codes/Rehlko/LED 4RehlkoLED 4UnclassifiedGeneralWhat This Code MeansGenerator set shutdownPossible Causes•Low oil pressureRelated Rehlko Fault CodesLED4LED5LCLLFL WTLOINTERN ERROR SHUTDWNLO CRANK VLT WI/OMODULELOSTCOMMLOCI/O MODULE NOT FOUNDLOCKED ROTOR SDBrowse all Rehlko fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for LED 4 on your specific Rehlko unit — cited to the OEM manual, not a forum guess.Your question about LED 4GET THE ANSWERFree account required — we'll bring your question with you.