Installed new T-stat & AC won't come on - http://www.hvacmechanic.com/ Forums
Original message
| crystal
 |  "Installed new T-stat & AC won't come on"
, posted Sun 10 Aug 08:39  
I had an old carrier heat pump t-stat and tried to change it out to a aprilaire 8346 digital. I did this on my downstairs unit and everything is fine. Upstairs, I changed them and now the system will not turn on, I even put the old one back on and it will not run. I did not cut off any power or breakers, is there a fuse I could have tripped? The wires are c (put brown wire here),,w2,r,g,y,o..same as old t-stat. Help! I have no ac
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Replies:
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| amech
| "Re(1):Installed new T-stat & AC won't come on" , posted Sun 10 Aug 08:57
Inside the indoor unit there should be a 3 or 5 amp mini fuse on the control board. If no fuse check for breaker on the transformer. A meter will also verify that you have main votage or secondary 24v at transformer to make sure it's not bad.
Hope this helps.
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| | Houston204
| "Re(2):Installed new T-stat & AC won't come on" , posted Sun 10 Aug 10:21
The indoor unit has 240 volts present, so turn off the disconnect(s) or breaker(s) before opening the panel.
(Probably not the breaker labeled heatpump, possibly AHU , Furnace, or Fancoil)
I don't have a Carrier example, but this is an example.
"Tip of the Day" Remember to remove power first.
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