NCM 300 and 2 nest third gen thermostats

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ssutton9000
Posts: 1
Joined: Fri Nov 30, 2018 9:08 am

NCM 300 and 2 nest third gen thermostats

Post by ssutton9000 » Fri Nov 30, 2018 11:45 am

Hi all,

I have a question regarding hookup. I have a Goodman ac/heat pump unit with a NCM 300 controller with 2 zones, upstairs and downstairs and honeywell thermostats. After hooking up the Nest thermostats, as seen below, when I try to turn the heat on it would turn on but not blow hot air, but when I turn the AC on, it would blow hot air. Why are the black/white wires together on the controller? I am not trying to short my system, so any and all help is greatly appreciated! Attached are the pics of my wiring.
http://s372.photobucket.com/user/ssutto ... tats/story

Paul Z.
Posts: 207
Joined: Thu Dec 08, 2011 3:05 pm

Re: NCM 300 and 2 nest third gen thermostats

Post by Paul Z. » Thu Dec 06, 2018 7:54 am

Call 18004463110 X490 have a few questions

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