Fault Codes/Discovery Energy, LLC (Rehlko)/STM FAILUREDiscovery Energy, LLC (Rehlko)STM FAILUREUnclassifiedGeneralWhat This Code MeansSTM Failure alarm raisedPossible Causes•More than 6 seconds elapsed since last processor message•CPLD Watch Dog Timer (WDT) time outRelated Discovery Energy, LLC (Rehlko) Fault CodesUNDER FREQUENCYUNDERFREQUENCYSRC N (OR SRC E) ROTATION ERRSHDNSD REVERSE POWERSD OVER POWERSD OVER CURRENT VRREMOTE COMMON ALARMPHASE ROTATION ERRORPHASE LOSSPEAK SHAVE MODEP2626Browse all Discovery Energy, LLC (Rehlko) fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for STM FAILURE on your specific Discovery Energy, LLC (Rehlko) unit — cited to the OEM manual, not a forum guess.Your question about STM FAILUREGET THE ANSWERFree account required — we'll bring your question with you.