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Hi there, thanks for your response! The issue ended up being with the 3-way valve. In speaking to Navien, my specific issue is rarely due to a flow sensor in itself and when it is, it is almost always accompanied with an error code as you mentioned (which in my case I did not get).

Hey all, My home has a Navien NCB-240E NG tankless water hater. After not having the system serviced or cleaned for a solid 5 years (I know -- not good), we recently had it done per recommendation of our plumber. They replaced the ignitor, cleaned the air inlet screen, replaced the filter, and...