Rattling Navien

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Rich F.

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Navien 240 Combi. When making DHW for a bath or shower, temp on the unit shoots up to 160-180 and it makes a high pitch whistling and rattling. I popped the cover off and the rattling seems to be coming from the heat exchangers. Unit has been working fine for a few years and flushed once a year by me.

The gas utility did come and swap the meter on my house last year as part of them running a new gas line on my block.

What gives?
 
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