I changed my old Honeywell thermostat for a new Honeywell WiFi thermostat. I installed it just as the directions stated. I used the alternate C-wire method as the old unit did not have one. Everything worked except for getting power to the air conditioner unit outside. I installed the old one back and it works just fine.

Any ideas as to why it doesn't get power with the new thermostat?

  • Did you run through the configuration of the thermostat? I know the new one I installed requires you to specify whether it is a heat only or heat/ac system, as well as gas/electric, High perf or not. – Steven May 27 '13 at 20:32
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    Could you post a link to the installation instructions you followed, and/or summarize the "alternate C-wire method"? This will help folks understand exactly what you did. – Tester101 May 28 '13 at 12:19
  • Yes I did. I have a gas furnace with central air. I even went through all the settings to make sure I didn't have it wrong. The alternate c-wire method can be found at m.youtube.com/#/… – user13203 May 28 '13 at 15:03

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