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  1. M

    Navien combi boiler won't stop hydronic heating

    Have a Navien NCB 180E combi boiler installed. Its producing hydronic heat run to an air handler and DHW well. However, i realized that when i set my thermostate to "fan on" with the system set to "off" just to circulate some air, the Navien is kicking on and sending hot water to the blower to...
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