Navien NPE 240a NG Tankless Screaming noise

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spidyrmen1

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I have a new Navien tankless water heater installed yesterday and it is making a ear piercing sound every 12min. The plumbing company that installed it is not a 24hr company. I have turned it off but now I don't have hot water. Any suggestions would be appreciated. Thanks in advance and happy holidays
 
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