AC problem
although you didn't say it, I assume it is a whole house unit. By fan I think you mean the one in the ducts of your house. Okak ,,so you have to check on the unit that sits outside your house, because thats where the refrigerant is pumped from. If you turn on your unit to a/c,,and have the thermostat set to its lowest,,,,the compressor and fan on the outside unit should be running. IF its not, the first place to go is to check the switches and circuit breakers out there to see if they are o.k. There is probably also some plug type fuses out there. You need to check those out too. Alot of times thats all it is.(also check the breakers inside of the house) If the thing is running o.k.and still no cooling then you might have a leak. Theres other things there too but you wouldn't know what i'm talking about and then you need the service guy.