Customer called and said the a.c wasn't working I went to the roof and the liquid line had oil around it the fan motor was spinning very very slow so I checked the compressor and it was defected. The contactor was stuck. I bought an entire new condensing unit and replace the old one. Now the unit only run when I manually push the contactor in. evaporator fan motor won't come on. Green light on the computer board is dead no powert to the thermostat what could be the problem