Fault Codes/Discovery Energy, LLC (Rehlko)/D01Discovery Energy, LLC (Rehlko)D01UnclassifiedElectricalWhat This Code MeansBattery charger faultRelated Discovery Energy, LLC (Rehlko) Fault CodesD04OVER VOLTAGEP0131P0132P0561P0562P0652P0698P0699UNDER VOLTAGED02D03Browse all Discovery Energy, LLC (Rehlko) fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for D01 on your specific Discovery Energy, LLC (Rehlko) unit — cited to the OEM manual, not a forum guess.Your question about D01GET THE ANSWERFree account required — we'll bring your question with you.