Hi, if you have no power, 24volts to your stat, remove your panel on the indoor unit to look at the control board. It will have a 3 to 5 amp fuse plugged into it. See if it is blown. If it is good, the next thing to check is the 120 voltx24volt transformer located in the control area.More then likely, you have blown that fuse for some reason. If you replace it and it blows again right off, you have a dead short on your secondary low voltage side. You will need to look for any stat wires that may be touching metal, the board may be bad. Pull or kill power to the indoor unit, remove the 4 screws holding the board in place, work it to where you can look at the back side for any hot spots, burned spots.If you find that it is, your board needs to be replaced. They do burn out very easy, a very common thing. Please let me know what you have found.
Shastalaker7
A/C Contractor
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