Hello, go to the unit outside and locate the two copper tubes attached to it, if the one covered in black rubber insulation is frosty or iced then the problem is that the cooling coil mounted next to the furnace is covered in a solid block of ice and that is blocking the air flow,
If thats the case turn power to the outside unit off and let the fan inside keep running, wait 4 or 5 hours, that will allow the ice to melt,
.Cause of icing are:
1. Dirty air filter or dirty cooling coil
2. Running the system with the thermostat set below 72F at night when it is cool outside.
3. System slightly low on refrigerant
Or a combination of all 3.
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