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Troubleshooting · NavienNavien NAE Series E506: Outdoor control communication errorTroubleshooting code E506→ Troubleshooting · NavienNavien NAE Series E507: Controller communication errorTroubleshooting code E507→ Troubleshooting · NavienNavien NAZ Series L0: Indoor control board EEPROM errorTroubleshooting code L0→ Troubleshooting · NavienNavien NAZ Series L1: Outdoor control board EEPROM errorTroubleshooting code L1→ Troubleshooting · NavienNavien NAZ Series d0: System control status codeTroubleshooting code d0→ Troubleshooting · NavienNavien NAZ Series dC: System control status codeTroubleshooting code dC→ Troubleshooting · NavienNavien NPF Series E238: Abnormal condensate or water-flow conditionTroubleshooting code E238→ Troubleshooting · NavienNavien NPF Series E786: Improper front panel or panel connectionTroubleshooting code E786→ Troubleshooting · NavienNavien NPF Series E799: Abnormal appliance control operationTroubleshooting code E799→ Troubleshooting · NavienNavien NPF Series E805: Inverter or control protectionTroubleshooting code E805→ Troubleshooting · NavienNavien NPF Series E860: Abnormal water or system control operationTroubleshooting code E860→