The pan in the inside of the unit or the one underneath for collecting and evaporating the water? If it's the one inside take the front bottom panel off and blow out the drain line leading down there. If its the pan underneath and it cant keep up with the water flow check to be sure it has some white cotton looking panels in the pan. They are an accessory called a wicking kit designed to absorb the water and as the air blows over them they help evaporate the water. If those are present and in good shape but its overflowing there you may need to get an electric condensate pan.
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The pan in the inside of the unit or the one underneath for collecting and evaporating the water?
If it's the one inside take the front bottom panel off and blow out the drain line leading down there. If its the pan underneath and it cant keep up with the water flow check to be sure it has some white cotton looking panels in the pan. They are an accessory called a wicking kit designed to absorb the water and as the air blows over them they help evaporate the water. If those are present and in good shape but its overflowing there you may need to get an electric condensate pan.