Fault Codes/Discovery Energy, LLC (Rehlko)/ALRTDiscovery Energy, LLC (Rehlko)ALRTUnclassifiedGeneralWhat This Code MeansALRTSuggested Actions1Check the interface on the Decision-Maker ® 3500 Controller for more detailsRelated Discovery Energy, LLC (Rehlko) Fault CodesCO-3CO-63217 5D121695 18D131270 6D15E0E3EMERGENCY STOPENGINE STABrowse all Discovery Energy, LLC (Rehlko) fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for ALRT on your specific Discovery Energy, LLC (Rehlko) unit — cited to the OEM manual, not a forum guess.Your question about ALRTGET THE ANSWERFree account required — we'll bring your question with you.