in case the user spends money but still cannot fix the problem.

Summary of Midea Air Conditioner Repair: Irregular shutdown caused by power supply issues

Analysis and Detection: According to national standards, the normal operating voltage for an air conditioner should be within ±10% of its rated nominal value. For 220V-powered air conditioners, the normal operating voltage ranges from 198V to 242V, with a minimum starting voltage of 187V. Since air conditioners are high-power-consuming household appliances, especially conventional models, their starting current can reach 3-5 times their rated value. This places high demands on the quality of the power supply. In some areas of China, residential grids were set up years ago specifically for lighting purposes. Not only are the lines aged, but during peak electricity usage times, the voltage drops significantly. If air conditioners are directly connected to such lines, various types of faults will inevitably occur. The most common fault is that the air conditioner fails to start or shuts down after working for a while. For example, due to large instantaneous fluctuations in grid voltage, the operating voltage of a running air conditioner may suddenly drop, making it unable to maintain operation and causing it to shut down (this fault is commonly seen near construction sites where the voltage drops dramatically when a motor starts, causing the air conditioner to stop). During peak electricity consumption periods, the grid voltage drops below 165V, preventing the air conditioner from maintaining operation and causing it to shut down (this fault is more common in unrenovated residential neighborhoods and rural areas). Additionally, if the wiring used for the air conditioner is too thin or if switches, meters, and other accessories do not meet requirements, it can also cause the air conditioner to shut down. After comprehensive detection, it was found that the N-line contact at the user's power terminal was poor.

Repair Method: After repair, the fault was eliminated.

Warm Reminder: The simplest way to determine whether the air conditioner's shutdown is due to external power supply issues is to use the voltage range of a multimeter to directly measure and observe the voltage value during the air conditioner's operation. If the input voltage drops below 165V at the moment of shutdown, it indicates that the air conditioner's shutdown is due to excessively low external power supply voltage. Although this does not belong to the inherent fault of the air conditioner itself, resolving it can be somewhat challenging. A common solution is to provide a dedicated line for the air conditioner and install a specialized voltage stabilizer. However, since this solution requires additional investment from the user, occasional disputes may arise, especially with newly installed air conditioners. Moreover, if the user is located far from the transformer, one must consider that even walking a dedicated line or installing a specialized voltage stabilizer might not solve the problem (especially in rural areas, where the line resistance is already very high at this point). Therefore, attention must be paid during repairs to avoid situations where users spend money but the fault cannot be resolved, leading to greater disputes.

Source of Information: Beijing Midea Air Conditioner Repair Center http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3760772.