Turned system on. Went outside and checked condenser. Condenser fan is running but no compressor. Checked capacitor and capacitor is bad and needs to be replaced. Replaced the capacitor and started the system. Checked pressures. Subcooling was at 1.4*, manufacturer calls for 10 + or - 3. Added 1 lb 12 oz R-410a to system. 11.5* subcooling after adding refrigerant. System is operating properly.