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Hi my name is ***** ***** I'm here to help you out! Do you have the model number of the unit? This sounds like the condensate line is blocked and needs to be cleared. In order to direct you to the location of the drain I will need to pull up the specs on your specific unit.
If you can vac out the water, you should be able to locate the drain hole that will let the water travel through the sealed chassis to the outer pan. If there is a hump, or the unit is not level, the water may not be unable to drain out properly.
Is the unit in a location where it can be removed from the wall to inspect the condition of the chassis?
Have you confirmed the unit is level or slightly tipped away from the front of the unit? Occasionally these units will tip forward and prohibit the proper drainage of condensate water