I have a flo master xp2 / 48 frame / 230V / 2.5 hp / 2 speed spa pump. I accidentally hooked switched the high and common lines when wiring the electricity. The low line was done correctly, because they were switched locations from my previous pump, but now the new pump doesn't work. Is there any way of saving my new pump, it wont turn on now

if 2 speed you need a 2 speed relay can do damage without

check for power on high with a meter, or bring it to your local pool pump motor repair guy with free testing. TAKE NOTE on where the wires are hooked up !! they must go back the way they came off !!!

DO NOT PLAY AROUND WITH THE WIRING OF THIS 2 PEED.
you can cook the motor in just a few seconds != junk
yes WHITE is common RED is low and BLACK is high
A picture of the connections in the back of the motor is needed for further assistance
Jay the pool pump repair guy in longwood Florida.

Frame size is not the same as the motor mount footprint.
If your motor does not have the frame size written on the spec label. You can measure the motor diameter.

all US motors should have a wiring diagram on the side of the motor unit. The wires going into the pump would hold their same values. I am assuming the previous pump was two speed as well, if not that is your problem.
assuming that they are both two speed reference the common on the pumps motor diagram, and connect the white wire to that terminal.
reference the diagram for correct low speed and connect the black wire to that termial,
repeat for the high speed.
I deal alot with the flo master pumps and they should all be labeled. The most important thing is to get the common correct, switching the other two wires (black and red) incorrectly would simply result in high coming on when low is supposed to and vice versa.

If there really is not a diagram, here is the most typical setup for that motor.

(if you look closely at the terminals on the motor, there are numbers there)
connect the white common to terminal #5
connect the red hot wire to terminal #1
connect the black hot wire to terminal #2
connect the ground
done

Hope this helps.
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The side of the motor will have a wiring diagram for how to connect the common, low and high speed leads. Your wire harness should have a white (common), black (usually low), red (usually high) and green (ground) wire. If high and low are backwards, switch the black and red leads.

Check or substitute motor capacitor

Should be you just have to reverse the high and low wires on the motor, I think the common wire stays the same.