Check that there's power available (open or tripped breaker or disconnect). If there's power available, check for 24-28 volts feeding the contactor coil. The low refrigerant cut-out may have tripped the 24v (leak). The pressure cut-out may have tripped (dirty condenser coil, inoperable condenser fan motor). If there's 24 volts at the contactor coil, check the capacitor before ohming the motor. A defective run capacitor will shut the compressor down.
Answers & Comments
Check that there's power available (open or tripped breaker or disconnect). If there's power available, check for 24-28 volts feeding the contactor coil. The low refrigerant cut-out may have tripped the 24v (leak). The pressure cut-out may have tripped (dirty condenser coil, inoperable condenser fan motor). If there's 24 volts at the contactor coil, check the capacitor before ohming the motor. A defective run capacitor will shut the compressor down.