Fault Codes/Discovery Energy, LLC (Rehlko)/SHDNDiscovery Energy, LLC (Rehlko)SHDNUnclassifiedGeneralWhat This Code MeansSHDNSuggested Actions1Check the interface on the Decision-Maker ® 3500 Controller for more detailsRelated Discovery Energy, LLC (Rehlko) Fault CodesUNDER FREQUENCYSD REVERSE POWERSD OVER POWERSD OVER CURRENT VRP2626P2311P2310P2309P2308P2307P2306P2305Browse all Discovery Energy, LLC (Rehlko) fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for SHDN on your specific Discovery Energy, LLC (Rehlko) unit — cited to the OEM manual, not a forum guess.Your question about SHDNGET THE ANSWERFree account required — we'll bring your question with you.