There could be quite a few problems with it. either it has something to do with the high or low safety pressure switches. Or you have a low voltage issue-not getting enough low voltage power to the coil of the contactor. how long do you wait after you turn the unit on? there is a 5 to 10 minute delay in the control board to keep the compressor from short cycling. meaning to keep the compressor from turning off then on again right away. short cycling a compressor too much will ruin it. There also could be an issue with the delay board it self. Or its a heat pump it could be an issue with the defrost board or the defrost sensor. I have even seen it to have a short in the wires of the coil of the contactor. But when that happens it will burn out the transformer or the low voltage fuse of the transformer or on the control board.
have you got it figured out already? If not can you give me more info on what it does? Or if it ever comes on after you wait at least ten minutes. Can you hear the hum the coil of the contactor makes when it is calling for the cooling. you might even have a problem with the contacts of the contactor not getting the proper power thru it to turn or keep the unit on.
Like I said there could be quite a few different possible issues with it to not stay on.
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SOURCE: The circuit breaker for the
It is tripping for one of two reasons. Either the a/c unit is pulling too many amps or the breaker is weak. If you have an amp meter then check the amp draw on you a/c, if it is pulling more than 24 amps then you need to have it serviced. If it is not pulling that many then you have a weak breaker and need to replace it.
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