Help! I have a Duncane A/C unit whose compressor will not turn on. After setting the thermostat to cool, the blower unit push air throughout the house, and the fan on the outside unit will run. But the compressor will not kick on. I have made sure that there is the proper current into the unit in the on and off position. All the wires seem intact and the connection unit into the compressor seems to be clean. What next? I would love to avoid calling a technician in for this! Help please!