Hi I have a new AC Unit Amana Evap Model CC60A3X-210R 075423 with AMANA HEATING & AIRCONDITIONING REFRIGERANT evaporator leaking water,I checked by pulling the plastic threaded plug out next to where the 1/2" PVC drain line is (upstairs unit in closet on 2nd floor,mainfan and all outside on ground level)Is seems the drain line is plugged and water is flowing over the sides of the drain pan and has soaked the entire ceiling and 2 full sheetrock panels have turned to mush and had to be removed,I am in Vegas,it is around 100 and rained yesterday so humidity is up,unit is about 1 year old completely new,what precautions must I take before attemping to clear the drain nline besides killing power obviously?

Heating & Cooling - Amana