When an air conditioning transfomer goes bad (shorted) you need to check the thermostat wire from the air handler or
gas furnace to the condenser. Most of the time it is out side at the condenser, the low voltage wire is exposed and is touching the other conductors causing the short. When you have the transformer replaced it is best to have a fuse in the low voltage line to protect the transformer from shorting out again. Also, make sure that the weed eater stays away from the wire and the wire nuts are not upside down causing rain to make it short out.
Hope this helps.
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