Web Reference: Nov 15, 2025 · Quickly diagnose and resolve the frustrating Navien E001 code. Learn the underlying causes of ignition failure and proven DIY solutions. Learn how to fix Navien error code E001. Boiler will not ignite and displays E001 on the control panel.. See common causes and step-by-step DIY repair instructions. Locate bleed valves on radiators or the boiler’s pump housing. Open valves slowly to release trapped air until water flows steadily. Check the circulator pump operation and pressure gauge (typically 12-15 psi). Air pockets can prevent hot water circulation despite warm pipes.
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