How to fix Navien Error Code E003

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Struggling with a Navien tankless water heater flashing the dreaded E003 error code? Don’t worry, we’ve got you covered! In this detailed tutorial, we’ll walk you through the steps to diagnose and fix the issue, ensuring your water heater gets back to working efficiently. We’ll cover common causes for the E003 error, such as ignition failure and issues with the gas supply, and provide practical solutions that you can implement right away. Whether you’re a seasoned DIYer or a first-timer, our easy-to-follow guide will help you resolve the problem quickly and safely. Don’t forget to like, subscribe, and turn on notifications for more helpful maintenance tips and DIY fixes!"

[@mystery_to_history]

Hi my tankless heater showing E003, I replaced the ignitor and can hear a faint noise repeat, as if a valve is trying to open. Sparks are observable from the viewing window; however, there is no ignition. Cleaned the filters, and bled the gas line and tapped on the pipes incase of blockage, still no success. Suggestions? - replacing the PCB board seems useless as it appears to be a gas supply issue.