Tony,
The first thing to do is check the actual voltage you have coming into the pump...
If you have 220 volts AC at the pump, then the most likely problem is a bad control head.
If you do not have 220 volts at the pump, then you will need to check the output of the circuit breaker.. I "assume" you have nothing between the circuit breaker and the pump.. If you have an old timer or some junction box you will also need to test there.
When testing 220, always test between L1 and L2, never test between L1 and ground and L2 to ground and add the results.. This can give you a false reading.
Did you actually reset the breaker? I would try that first.
Thanks,
Jim R.