Navien Water Heater Flow Sensor Replacement

Video short demonstrating how fast and easy it is to replace a Navien tankless water heater flow sensor. A flow sensor that is faulty will exhibit a no hot water or inconsistent hot water condition. In this particular home when lower flow water fixtures such as sinks needed hot water that there would be no hot water. High flow fixtures like a bathtub would always have water indicating that the flow sensor is starting to fail.
Tools needed are a #2 Philips screwdriver, a pail, and a pair of plumber pliers.