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I’m working with navien plumber. Just worried flow sensor is not the issue. Good to know it should be fixed when flow sensor arrives.

Navien npe 249a2 installed in January 2023 and working fine until three weeks ago. Upon request for hot water, flow rate only reads 0.5 gpm even though actual flow is more like 3-4. Hot temp out is only a temp rise of about 5 degrees (75deg f). No error codes. Sometimes upon hot water request...