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Ensure the compressor is running. It has a large capacitor connected to it that helps the motor to start. They go bad. There is a relay controlled by the thermostat that starts the compressor. It could be as simple as replacing the relay. Now the breaker. There are 2 of them side by side with their handles joined so when one trips so will the other. That isn't always how it works, though. Reset the breaker several times to be sure. There are fuses inside the power disconnect box on the outside of the unit. If one is blown, the compressor won't run
It sounds like the run capacitor(silver can in control box) has failed if your comfortable around electrical you can change it; just replace it with the same rating as your other one. Make sure the power is off and write down it rating (i.e. 35+5 370 or 440 volts for a dual or 35 370 or 440 volts for a single).
0204 built the second week of 2004 sound like you have a loose or burnt wire in the a-c and arcing when the unit comes on. turn the breaker off next time you fix an outlet
When ever you hear a buzzing like you are hearing means one thing one of the fuses on the outside disconnect box is bad. Only getting 1/2 the power. Find the bad fuse and get the same size and will be good to go. ken
2 summers ago, exact same problem with one of our two units outside. contractor that installed the unit when home was built was not helpful and not able to come out. another a/c company explained they would not be able to make it that day, but offered knowledge that often times in my area (San Antonio, TX) ants get into the electrical contacts of the mechanical switch and block the current.
following instructions to trip all the breakers inline and checking this it was confirmed, i cleaned the contacts with pencil erasers (a trick i learned with model car electric leads) and sure enough it's still working 2 years later.
believe it or not the same year my water well had the same symptoms and it turned out to be the mechanical switch was blocked by ants also!
Do you have any frost on the lines going to the outside unit. If the large line is frosted your evaporator (Cooling coil in the furnace) could be frozen up. Operating it with the fan in automatic with the cooling on will sometimes be the cause of this condition.
If there is not frost on the large line going to the outside unit and you are getting air circulation inside the house the problem could be a loss of refrigerant charge. Look at the joints where the pipes were soldered to the inside and outside units for signs of oil. If you find oil at any point it is the indication of a refrigerant leak.
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