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    Navien Wont open zone valves when stat calls for heat

    Hello, I have a Navien NCB-190/080H. Domestic water side operates perfect, heating side however seems to have some issues. I have 2 zones both zones have honeywell yo yo heating stats and and honeywell NC zone valves. When stat is calling for heat i am reading 24v at points on board, the unit...
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