guess the first step is to verify that the thermostat is in fact calling for cooling. by moving the fan switch to "on" you have the fan coming on 24/7, now you just have to make sure that if you turn the desired temp down that the A/C will run. most of those stats allow you to hit a hold button and that will over ride the program to whatever temp you choose to select. Obviously you would set that to below what the room temperature is to try the A/C out. If you know the model number of the thermostat we could research it for you, or you could take a picture of the thermostat and likely someone will recognize the model and proper set up.