LG After-sales Case: Poor air conditioner cooling effect, the outdoor unit stops after an hour.
Fault Phenomenon: Poor cooling effect, the outdoor unit shuts down after running for an hour.
Repair Process: According to the reported issue, the user has been consistently reflecting poor performance since the air conditioner was installed. The repair personnel had visited multiple times but were unable to resolve the problem. Upon inspection, all maintenance data appeared normal immediately after turning on the machine. However, after running for a period of time, the current of the air conditioner gradually increased, and the outlet air temperature also rose. After one and a half hours, the air conditioner entered protection mode (compressor overheating). The external heat dissipation environment of the outdoor unit was checked and found to be good, and the condenser was not dirty. Possible faults judged were: 1. Compressor failure; 2. System refrigerant contamination; 3. Pipeline issues. Based on the phenomena, the system and pipeline problems were checked first. It was discovered that there was a bent and flattened section in the low-pressure connection pipe at the wall exit, causing an obstruction in the system's piping and resulting in poor cooling.
Repair Measures: The pipelines were reprocessed, and the test run was normal.
Article Source: http://blog.sina.com.cn/lgkongtiaowx.