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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 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 airhandler wont have a wall will have a disconnect box with fuses in is also 240volts so be carefull.

Posted on Dec 29, 2008

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Compressor want come on

Here is what to do . Pull out or turn off Electrical disconnect behind unit . Carefully remove panel covering controls in unit . Note most units have a flat panel with a few screws, but some GE units have a welded metal box on top of unit which needs to be removed. After exposing controls. replace or turn on disconnect. Then take a plastic handled screwdriver and push in on center of contactor (boxlike part with a lot of wires hooked ) If the compressor now comes on release contactor , and check for 24 Volts AC at base of contactor where thermostat (small wires that run on outside of black refrigerant line ) with thermostat on and calling for cool you should measure 24 to 28 volts . If voltage is present replace contactor after disconnecting from power. If no voltage go inside , remove cover from thermostat, and check for 24 volts between red ( R) and yellow (Y ) terminals on thermostat , If voltage is present , replace thermostat , no voltage check voltage in heater / air handler if you have voltage at air handler , replace thermostat wire from heater to thermostat / if no voltage check for blown fuse in heater , this should be either an inline fuse or an automotive type fuse plugged into circuit board (with power to heater disconnected check broken wire or black mark in fuse when held up to light. If fuse good turn on power to heater and check for 230v to one side of transformer, if you get voltage to Primary (incoming side ) of transformer, check output side of transformer for 24 - 28 volts. If transformer shows input but no output replace transformer after turning power off. If you heard a buzzing or grinding noise , when pushing in contactor , but compressor didn't start look at run capacitor (this is round or oval shaped object with wires going to contactor and compressor ) Looking at area where wires plug this should be a flat surface , if it looks domed shaped or bulging out , it is blown and needs replaced , use same mfd rating and 440 Volts to be on safe side. / If there was no noise from compressor when contactor was pushed in , put your hand on top of compressor (black object in center of unit ) If hot , allow to cool for at least three hours with power to unit turned off and retest . If compressor comes on after cooling , check for bad fan motor in outside unit (it may make a squealing or wining noise and stop runing for a while , also check for / clean outdoor coils
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1 Answer


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1 Answer

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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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1 Answer

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1 Answer

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Disconnect all wires to start.
1)Go out to unit shut off power and remove electircal panel.

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1 Answer

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1 Answer

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It sounds like you have a short in the control unit at the ceiling pack. Remove the inner shroud from the AC and pull down the control unit. Remove the cover from the control unit to access the relays. With the thermostat off, check for power at the white (or orange depending on the unit) wire coming from the thermostat to the relay board. Also check power from the yellow and gray wires from the thermostat to the control board. None of these should be hot with the thermostat off. If there is power then you have a short in the wiring between the tstat and the upper unit. If there is no power, then you have a bad control board.

Hope this helps,


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1 Answer

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