Navien Tankless Water Heater Review: Products, Problems & Comparisons
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installing a tankless water heater. navien model 240A with webstone isolation valves | Evan Berns
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In order to fix a Navien tankless water heater error code E438, you can try the following: Check the circulation pump: Make sure the pump is not damaged and is functioning properly. Check the flow sensor: Clean the sensor if there is any scale or debris buildup. Check the water supply and return lines: Make sure they are open and clear of any obstructions. Check the 2-way valve: Make sure it is positioned correctly to allow proper water flow. Descale the unit: You may be able to descale the unit
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