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Navien Navien NPE-A2 Series E421: Cold water inlet thermistor open or short Troubleshooting · NavienNavien NPE-A2 Series E421: Cold water inlet thermistor open or shortTroubleshooting code E421 Navien Navien NPE-A2 Series E432: Cold water inlet 2 thermistor open or short Troubleshooting · NavienNavien NPE-A2 Series E432: Cold water inlet 2 thermistor open or shortTroubleshooting code E432 Navien Navien NPE-A2 Series E434: Abnormal operation: water adjustment valve Troubleshooting · NavienNavien NPE-A2 Series E434: Abnormal operation: water adjustment valveTroubleshooting code E434 Navien Navien NPE-A2 Series E438: Abnormal operation: circulation pump Troubleshooting · NavienNavien NPE-A2 Series E438: Abnormal operation: circulation pumpTroubleshooting code E438 Navien Navien NPE-A2 Series E439: Abnormal operation: flow sensor or no domestic water flow detected Troubleshooting · NavienNavien NPE-A2 Series E439: Abnormal operation: flow sensor or no domestic water flow detectedTroubleshooting code E439 Navien Navien NPE-A2 Series E441: Domestic hot water inlet/outlet 2 sensor open or short Troubleshooting · NavienNavien NPE-A2 Series E441: Domestic hot water inlet/outlet 2 sensor open or shortTroubleshooting code E441 Navien Navien NPE-A2 Series E445: Abnormal operation: bypass mixing valve Troubleshooting · NavienNavien NPE-A2 Series E445: Abnormal operation: bypass mixing valveTroubleshooting code E445 Navien Navien NPE-A2 Series E515: Abnormal operation: PCB Troubleshooting · NavienNavien NPE-A2 Series E515: Abnormal operation: PCBTroubleshooting code E515 Navien Navien NPE-A2 Series E517: Abnormal operation: DIP switch setting Troubleshooting · NavienNavien NPE-A2 Series E517: Abnormal operation: DIP switch settingTroubleshooting code E517 Navien Navien NPE-A2 Series E593: Abnormal operation: front panel key Troubleshooting · NavienNavien NPE-A2 Series E593: Abnormal operation: front panel keyTroubleshooting code E593 Navien Navien NPE-A2 Series E594: Abnormal operation: EEPROM Troubleshooting · NavienNavien NPE-A2 Series E594: Abnormal operation: EEPROMTroubleshooting code E594 Navien Navien NPE-A2 Series E615: Abnormal operation: input and memory Troubleshooting · NavienNavien NPE-A2 Series E615: Abnormal operation: input and memoryTroubleshooting code E615