Circuit breaker trips when turning unit on. only unit on circuit has triped on several circuits can find no shorts on wiring.

If the main RCD is tripping it indicates current is leaking to ground because of an appliance fault.

If it is the micro circuit breaker that is tripping it indicates a short circuit or an overload, also due to a fault.

I believe it is supposed to have a 15. Remember, breakers are installed TO PROTECT THE WIRE, NOT THE EQUIPMENT. If a breaker is tripping you just don't put a bigger breaker. The wire must be the correct size for the breaker. Take it to the manufacture.

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The best guess is that you have a bad thermostat. When the compressor shuts off it has to stay off for a long enough period of time for the low pressure high pressure to equalize. If it turns the compressor off and back on immediately it can't start against the heavy load created by these unequal pressures. If it will start every time after sitting for 10 minutes the thermostat is making it short cycle.

It needs to be determined wether it's a dead short or the compressor is bad. A dead short is when the hot (colored) wire is in contact with the neutral (white) wire in a 120 V system.
I would get to the compressor connection box and disconnect the power from the compressor and turn the circuit breaker on. If it trips, it's a wiring problem. If it doesn't trip, the compressor is shorted internally.
As an alternate test to disconnect the compressor, you can turn the thermostat to off and reset the breaker, if it trips, then it's a wiring problem, if it doesn't trip and as soon as you turn the thermostat to on, then you must go to disconnecting the compressor and check it again with the compressor disconnected.
Other tests, an electrical meter is required.

you will need to access the unit and look for burnt/shorted wires on/at compressor. if not then the compressor is locked down/shorted and will need replaced Tim

well you right in saying "its triping the braker off" thats what it is doing,,
there is a problem with the washer motor,,its pulling far to many amps so its a fulty motor,,,and it will just keep triping the trip out,,,
its a good job you have trips,,the motor could have gone up in smoke

Your unit have dirty coil.
Shut unit off and clean the coil also change filter for indoor unit .Unit is shutting off on high head pressure

A circuit breaker 'tripping' everytime the AC unit kicks on 'most always' indicates a direct short (somewhere in the condensing unit), although it is possible that the breaker itself is bad - (but not likely).

Usually the cause of this 'short' will be - either the condenser motor in the condensing unit (outside unit) or the compressor - also in the condensing unit.

If you're mechanically inclined - and "very careful" around electricity - there is a fairly simple way to find out which component is causing the short.

Step 1 - Make sure the condensing unit (outside unit) is completely disconnected (electrically) , i.e. pull the fuses/turn off circuit breaker on outside unit and turn off thermostat.

Step 2 - disconnect the condenser motor (this is the outside fan motor). Note: when you disconnect the wires of the condenser motor "be sure" you mark/write their location, and wrap them in electric tape.

Step 3 - start the AC unit. If the breaker trips again you can pretty much rest assured it's the compressor that is shorted.

To prove it (without a doubt) - go to next step.

Step 4 - "be sure circuit breaker and thermostat is turned off" - and - 'reconnect' the condenser motor - and - then disconnect the compressor wires (mark wires and tape them).

Step 5 - Start AC.

If breaker doesn't trip - you know it's the compressor that is shorted.

If breaker 'does' trip again - then it's possible the breaker itself is bad (not likely) or there is a 'short' in the condensing unit's "wiring" somewhere (not likely).

My guess is that either the condenser motor or compressor is shorted.

Hope this helps.

Good Luck!

It may be that your water pump is leaking on to the motor...

The problem is either in the spa or the circuit breaker itself is faulty. I would begin by changing the circuit breaker as it is much cheaper than a new pump.