My central air is about 4 years old and has been working fine. This year it keeps tripping my fuse box. The central air will work for a day or two and then it starts blowing warm air. I check outside and the fan (maybe called the compressor but not sure) is not on. I go check my fuse box and the section for the a/c unit has been tripped. I reset it and then it works for a day or two again. Had the service guys come out but it never stops working when they are here. They checked all the wires and said that all the amps are good and that it seems to be working fine. This morning same thing happened and when I went to reset the a/c section of the fuse box - it won't reset.

Could be a defective/weak circuit breaker.