There is a knob on the back and bottom of the air conditioner. Twist off the knob and unplug the little black plug and empty the water into a container. I had the same problem and this worked for me.
shutting off on a pressure switch. either high or low pressure. high likely is no condenser fan, low means a leak. If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79
If this one is not close enough, you can make your own descaling solution my mixing a 50/50 solution of White Vinegar and Bottled Distilled Water. I have been recommending this for years to folks who have a scaling problem with humidifiers, electric irons, coffee makers, etc. In every case it worked well for them.
Hope this helped you and thanks for choosing FixYa.
