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The Navien 30020431B is a main control board (PCB) for Navien NFB-C series boilers and tankless water heaters. It serves as the primary control module for system functions and diagnostics, replacing the factory main PCB (model GBC301 P10). Common uses include repair and replacement during maintenance or fault remediation on NFB-C units. The part is an OEM replacement identified by SKU/MPN 30020431B and UPC 884954271569.
Main PCB replacement for Navien NFB-C series (GBC301 P10), MPN 30020431B; OEM part with UPC 884954271569.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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