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Ok does the blower fan run when you set it to FAN ON?
OK can you see if the fan inside is running or go to the furnace to check the copper line going into the plenum.
The unit may be low on freon and the evaporator coil may be iced over. If it is then you will have no cold air to your house and the unit will be running as it is. This is a very likely issue. If you are not mechanically inclined check the filter, because if it is clogged that can also cause this issue. Other than that you may have a bigger issue that you may want to call a tech out for.
All I ask is please rate my service thanks!
It should be on the furnace and should just slide out.
Yes I am sorry, this may be a bigger issue for sure as these units are very technical and a lot can go wrong.