Check the fuse inside the furnace first. If the fuse checks out good, then it could be a component on the outside unit such as a capacitor or contactor coil.
Hello my name is Heath it will be my pleasure to assist you. First thing to do is go to the furnace take off the lower blower door and locate the circuit board turn the power off to the furnace. In the circuit board there should ba a small car like fuse usually 3 or 5 amps check the fuse it is probably blown replace the fuse with the same amperage fuse and then turn the power back on on the furnace and check the operation of the furnace.
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Need more information. By "not starting", does this mean the inside air handler and the outside condensing unit will not start running when you set the thermostat in the cooling mode and turn the thermostat set point below the room temperature?
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