Turn it off and leave it off for an hour or two
It is just a simple fan blowing over a coil.
Turn it on the Fan setting and let it run about 20 min. to about 1/2 hr.
The evaporator coil condenses the humidity in the air dehumidifying it.
You probably have mold on the evaporator coil.
The evaporator coil is probably freezing up which will restrict airflow.
Water dripping on the front of a portable air conditioner could mean that the air filter needs to be changed. Your evaporator coil may also be dirty.
Most of the ones that I have seen have dirty condensor coils. That's the coil you see from the outside. They get dirty on the inside of the air conditioner where the fan blows air through it.
It is the humidity from the air passing through the cooling coil that has condensed on the coil. By drainig it out the humidity inside the room is reduced and you feel cooler.
This is a fan coil unit produced by the Carrier Coporation.
The coils can be cleaned using a coil brush and foaming coil cleaner. These items are available at www.appliancepartspros.com.
There are 2 coils. 1 inside the indoor air handler or furnace and 1 outside on your condenser in the yard.
Dirty air filter , bad fan motor,duct leakage under house,ice on coil.