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-   -   Help getting a/c to work with new thermostat (https://www.askmehelpdesk.com/showthread.php?t=592792)

  • Aug 14, 2011, 05:29 PM
    floridaguyhere
    Help getting a/c to work with new thermostat
    Came home last night and the a/c didn't work. The thermostat looked like it had no power running to it since the digital screen wasn't lit up. So this afternoon I bought a Honeywell rth2300 and now I'm lost. I hooked red to R green to G yellow to Y white to W and there's a blue one but I'm not sure where it goes. My sons and I are roasting and need help plzzz. I have a trane air handler and trane a/c unit outside
  • Aug 15, 2011, 08:51 AM
    wmproop
    Most of the time the blue goes to common/C post,, but isn`t necessary if you use batteries in tstat,, the common /blue takes away the need for batteries in most cases
  • Aug 15, 2011, 08:54 AM
    wmproop
    There also is a good chance you didn`t need a new tstat,, problem was somewhere else,, does old tstat need batteries? Did you replace them?, possible several other probs.

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