How to Replace Navien 3-Way Valve on an NCB-240. Full steps to replace the 3 way valve on your Navien. No heat but you have hot water? Or no hot water but you have heat? The Navien 3 way valve is famous for failing in one of these two positions. At the end of the video, my 3 way valve was stuck. I show you the exact steps to remove it. Good luck!

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Part number 30028157A
Should fit Navien NCB-H and NFC-H