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Ever wondered how you can keep that fancy Navien tankless water heater humming like a happy little appliance? Well, you’ve come to the right place, Issue: Navien water heater is excessively noisy with a high-pitched whine or grinding sound from inside the unit, Check it out, Get step-by-step instructions to safely adjust the temperature and troubleshoot operational blocks, Water Heater Making a Banging Noise Navien Tankless Water Heater Humming Noise [10+ Easy Fixes] 1, Get hot water flowing again!-------- A tankless water heater has very little time to heat the water and get it to the desired temperature, A Navien tankless water heater not staying hot could be due to a blocked exhaust or a malfunctioning flow sensor, What you need to do now is- follow the … Navien tankless water heaters are known for efficiency, but unusual noises can signal problems, Ok so I had 2 contractors came out and couldn’t figure what’s wrong with my Navien, Call Rick's Plumbing at (203) 889-9959 for quick repairs,