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  1. General HVAC Discussion
    I have a 10 year old complete heat tied to the am 30 it was sold with. No DHW. The am 30 can not see that the hm has hot water in it. Tech support had me change the board in the am unit. New circ pump on top of hm unit. circ pump in am unit good and works when 115v is applied. occasionally the...
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