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Ours has been whistleing for over a year. I was told it is a bit of corrosion in one of the inlet or outlet connections. I could open it up and flush the system, but it probably wouldn't help.
The whicleint has not caused any problems and we have gotten used to it, but i recently drained, cleaned, and flushed the entire potable water system. This did not stop the whislte but did reduce it.
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