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Navien Navien NFB-399C E302 Troubleshooting · NavienNavien NFB-399C E302Low water pressure Navien Navien NFB-200H E615 Troubleshooting · NavienNavien NFB-200H E615Abnormal operation: input and memory Navien Navien NFB-200H E302 Troubleshooting · NavienNavien NFB-200H E302Low water pressure Navien Navien NFB-200H E004 Troubleshooting · NavienNavien NFB-200H E004False flame detection Navien Navien NFB-200H E353 Troubleshooting · NavienNavien NFB-200H E353Water pressure sensor issue Navien Navien NFB-200H E736 Troubleshooting · NavienNavien NFB-200H E736Abnormal operation: cascade communication Navien Navien NFB-200H E060 Troubleshooting · NavienNavien NFB-200H E060Abnormal operation: dual venturi Navien Navien NFB-175H E278 Troubleshooting · NavienNavien NFB-175H E278External supply sensor not detected Navien Navien NFB-200H E740 Troubleshooting · NavienNavien NFB-200H E740Abnormal operation: outdoor temperature sensor Navien Navien NFB-175H E279 Troubleshooting · NavienNavien NFB-175H E279External return sensor not detected Navien Navien NFB-399C E775 Troubleshooting · NavienNavien NFB-399C E775Auto reset limit Navien Navien NFB-200H E291 Troubleshooting · NavienNavien NFB-200H E291Return temperature exceeds supply temperature