**Title: AOXI Air Conditioning - Repair Case; System Leakage Caused by Lack of Refrigerant**
**Fault Phenomenon:** After running for a period of time, the air conditioner leaks water. Frost or ice forms on the evaporator fins.
**Cause Analysis:** The user reported that the indoor unit was leaking water. After turning on the machine and running it for 10 minutes at the site, we found that the indoor fan started blowing water. Upon removing the panel frame, we discovered that 2-3 long U-shaped tubes near the input pipe of the evaporator were very cold with a lot of condensate water, while other parts of the evaporator fins did not feel significantly cool. After restarting the machine and continuing to run in the original cooling mode for over 20 minutes, frost or ice began forming on the evaporator fins near the input pipe. Using a pressure gauge to measure the system pressure, it was found to be very low (3KG), indicating a severe lack of refrigerant. In the case of a serious refrigerant shortage, the refrigerant entering the evaporator quickly vaporizes in the first 2-3 long U-shaped tubes near the input pipe, so the temperature of these 2-3 U-tube fins is relatively low, while the temperature of the other U-tube fins approaches room temperature. Therefore, a large amount of condensate forms on the 2-3 U-tube fins near the input pipe and is blown out by the wind. About 20 minutes later, frost or ice begins to form on the evaporator fins.
**Repair Measures:** Inspect for leaks and find that the misalignment at the connection between the connecting pipe and the low-pressure valve body caused fluorine leakage due to improper nut locking. Reconnect and tighten the connections, re-evacuate the system, add refrigerant, and test the machine, which then operates normally.
**Experience Summary:** For issues of indoor unit water leakage in air conditioners, after excluding air leakage from the indoor heat exchange system, you can use your hand to feel different sections of the heat exchanger to perceive temperature differences, preliminarily determining whether there are obvious temperature differences, thus judging if internal condensation is caused by system problems (generally, system problems causing water leakage manifest as fine water droplets forming inside the air ducts, and water droplets are visibly present on the fan blades).
**Source of Article:** http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3486891