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Is the pipe leading from the unit into the house covered in frost? If so, then your coils are probably frozen. Turn off the AC for an hour or so, then turn back on and all should be well. If it continues to ice up, you may need to get a repairman to come charge your system and check for leaks.

If the pipe is not frozen, make sure the fan unit is turning on as it should. If not, check your fuses. If the fuses are good and the breaker hasn't tripped but the unit still does not come on your fan may be going bad. Usually it will hum like it's trying to come on, but can't get started. To get by until you can get a repairman out to your house you can stick a pencil between the slats and give the blades a nudge to get the fan running again - this is a short term fix as the problem will just get worse until the fan locks-up.

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