What are the reasons for the compressor not starting?

[ZoeLynn]

Compressor not starting may be due to air not being completely evacuated from the system during installation, leading to ice blockage; or the compressor power supply is not properly connected or there is no electricity. Below are detailed explanations regarding compressor failure to start: Compressor ice blockage phenomenon: If air is not completely evacuated from the system during installation, ice blockage may occur, increasing the compressor's workload. The increased load raises the compressor's temperature, causing the refrigeration oil to deteriorate over time under high temperatures, failing to provide lubrication and cooling. This further elevates the compressor's temperature, reducing the insulation of the coils due to high heat, ultimately damaging the compressor. Solution: Ensure strict quality control during installation. Compressor power supply not connected or no electricity: Poor contact in the power cord socket, or the power cord is too thin or aged, or the power voltage is too low. Starting voltage for fixed-frequency air conditioners: 187V, voltage fluctuation range: 198-242V; starting voltage for variable-frequency air conditioners: 156V, voltage fluctuation range: 176-264V. It is recommended to install a voltage stabilizer in households. Additionally, bending or flattening of connecting pipes during installation can increase the compressor's workload. Solution: Check if the power cord is aged.

[LeMary]

I've been driving for almost ten years. Last summer, during a long-distance drive, the air conditioning compressor suddenly stopped working, and the car became as hot as a steamer. After inspection, it was found that the fuse might have blown, commonly due to overload or aging; or the belt might have loosened, failing to drive the compressor. Electrical issues are also frequent, such as worn relay contacts preventing current flow, or sometimes poor contact in the switch button. Low refrigerant pressure due to leaks triggers the system's automatic protection to prevent startup, avoiding further damage to the compressor. Some sensor failures can also prevent signals from reaching the computer. If you encounter such a situation, don't push through—it affects driving safety—and get to a repair shop for a check-up. Remember to maintain the air conditioning system annually and check the belt tension regularly.

[BrielleLynn]

As a DIY car repair enthusiast, I've dealt with compressor failures several times. First, open the hood to check if the belt is intact - if it's loose or cracked, the compressor won't turn. Second, inspect the fuse box for AC-related fuses and replace any blown ones. Third, locate the relay in the control module and listen for clicking sounds - a clicking noise might indicate an issue. Low refrigerant pressure is another critical cause; measure it with a gauge and recharge if too low. Professional tools are needed to diagnose a faulty compressor itself. I always recommend starting with simple checks and visiting a 4S shop if problems persist to avoid mistakes. Regular part replacements can prevent major issues.

[KaydenLynn]

In maintenance work, we encounter quite a few such failures. The compressor not starting usually stems from a blown fuse, broken belt, or damaged relay. If the pressure in the refrigeration cycle is too low, the protection system locks it out; oxidized switch contacts can interrupt the signal. Both short circuits and open circuits can cause this—use a multimeter to test the path. Internal compressor failures, such as seized bearings, are difficult to repair. Upon discovery, stop the vehicle immediately for inspection—don’t delay too long, as safe driving is paramount. Promptly send it for repair, where technicians will conduct a comprehensive diagnosis.

[GemmaFitz]

Once when I took my family on a trip, the compressor stopped working, causing the temperature inside the car to soar, affecting comfort and concentration. The reason might be a blown fuse, which can be easily fixed by replacing it; or the belt might be slipping and not turning, which can be checked and tightened. If the refrigerant leaks and the pressure is too low, the system prevents accidental startup; controller failures are also common. In an emergency, check the fuse, but avoid tampering to prevent electric shock. While driving, ensure safety by pulling over to rest and seek repairs. Regular maintenance of the air conditioning can reduce these troubles, especially performing a simple self-check before long trips.

[WalkerMarie]

The compressor fails to start. On a deeper level, it could be due to electrical issues such as a burnt relay coil causing no current flow, or unstable voltage and overload. A malfunctioning pressure sensor in the refrigeration system sending incorrect signals may falsely indicate low pressure and prevent startup. Insufficient belt tension leading to slipping renders the compressor inoperable. Internal mechanical damage, like a stuck piston, may require replacement. Environmental factors such as high temperatures can accelerate component aging. While driving, I pay attention to monitoring these points, perform regular maintenance, and replace parts to extend service life and avoid unexpected failures. When dealing with faults, it's most reassuring to seek professional evaluation.