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  1. MJB84

    Hi, I've read your posts about Navien units.I have a NCB-240E (moved in winter '17) that is only...

    Hi, I've read your posts about Navien units.I have a NCB-240E (moved in winter '17) that is only on water heating duty. The unit is kicking on frequently for short bursts when there is no call for hot water. All heat zones are off, no water use of any kind.Any idea on what could be the issue...
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