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  1. #1

    Two zones, but AC isn't coming on in Zone 2 on its own

    We moved into our new home just awhile ago and found a two-zone heating/AC system. Or so I thought. Standard two-zone setup (1st and 2nd floors divided) with gas furnace in the basement. Home was built in 2002.

    The heat works fine. If either zone calls for heat, the furnace turns on and delivers.

    I thought the AC would work the same way, but it doesn't. If Zone 2 (upstairs) calls for AC, it doesn't turn on. We only get AC upstairs when Zone 1 is on.

    Is this the way it's supposed to operate? If not, is it likely a thermostat problem with Zone 2? It's one of the thermostats recommended by the zoning manufacturer, but it is not matched (different brand) than the 1st floor thermostat.

    Thanks!
    Last edited by bostongio; 06-09-2008 at 09:51 AM. Reason: Clarified title

  2. #2
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,793
    Could be a stat problem. Could be a wiring problem. Could be a panel problem.
    You need you HVAC service guy out to check and fix it.
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    How many times must one fix something before it is fixed?

  3. #3
    Join Date
    Dec 2007
    Location
    Cedar Grove, Wi-Sheboygan
    Posts
    1,582
    Sounds like zones 1 and 2 are wired backwards for cooling since you said when zone 2 calls for cooling zone 1 dampers open

  4. #4
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,793
    Quote Originally Posted by DanW13 View Post
    Sounds like zones 1 and 2 are wired backwards for cooling since you said when zone 2 calls for cooling zone 1 dampers open
    He didn't say that.
    He said he only gets A/C upstairs when zone one calls. He never said zone 1 gets A/C when zone 2 calls.
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  5. #5
    Hey guys,

    Figured out the problem by pouring over the manuals for the thermostat and the zone control system. Seems when they installed the thermostat, they took off the RH/RC jumper. So it worked fine in the winter for heat, but not for the AC. Put the jumper back on and all is fine now.

    Might help some future homeowner......

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