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My thermostat has no power. the wires to it has no power. The fuses on the heater chip board are okay. What else can I do? Where can I locate the transformer to the A/C/Heater?

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In the control box to your furnace or air handler, there should be a transformer near by.be careful though, it has high voltage going to it though.just follow the high volt wires, the large ones,from the wall plug to the machine, into the control box to the transformer or the fuse chip board.the big black wire will go to terminal L1 at the board and the white wire will go to nuetral at the board.unplug your wall cord first so you won't get shocked. it is hard to see into the control box and board connections.also, plug a light or lamp into he wall socket to see if you have 110volts to the plug.

do that for a split system.an airhandler wont have a wall socket.it will have a disconnect box with fuses in it.it is also 240volts so be carefull.

Posted on Dec 29, 2008

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Compressor want come on


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First step is go to your thermostat and turn the Fan switch from AUTO to the ON position, if the indoor blower runs you have proven that you have both high and low voltages and no need to check breakers, and fuses both high and low voltage.

If the Fan does not come on then you need to determine whether you have high and low voltage, the high voltage may have a time delay fuse as well as a beaker, these fuses are located at the electrical disconnect typically within 3 feet of the unit, inside it in a plug/fuse holder that must be replaced in the correct position as 180 degrees off = OFF or no power.
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