Common Air Conditioner Repair Issues - Air Conditioner Not Cooling Fault Phenomenon: The indoor unit's "running" light blinks (the other lights do not illuminate), and the indoor and outdoor units do not operate. Analysis of Causes: According to user reports, the unit starts up normally without any issues. However, after about 30 minutes, both the indoor and outdoor units stop working. The running light on the control panel blinks, and pressing any key results in no response from the air conditioner. After unplugging the power and attempting to restart the unit, it operates normally. Nevertheless, the same fault occurs after 30 minutes again. Since both the air conditioner and cooling were normal before the shutdown, there should be no system problem. The initial judgment is that there is an issue with the external signal...