The intervention of energy-saving mode of automotive air conditioning; High exhaust pressure and low suction pressure; Insufficient or excessive refrigerant; The setting limit of the relay is too high. Automotive air conditioning refers to the air conditioning device installed on the vehicle, which can cool, heat, exchange air and purify the air in the compartment, provide a comfortable riding environment for passengers, reduce the fatigue intensity of drivers and improve driving safety.

Automotive air conditioning generally includes cooling device, heating device and ventilation device. This kind of collaborative device makes full use of the relatively limited indoor space inside the car, which is simple in structure and conducive to practical operation. It is now the world's popular intelligent automotive air conditioning system software.

There are three ways of central air conditioning shrink protection: overheat protection, low temperature protection, overcurrent protection overheat protection: after the system software is short of fluorine, it will operate for a long time; The system software runs for a long time due to blocking (ice blocking or dirty blocking); The ambient temperature is too high; The compressor overheat protection equipment is broken.

Only after the temperature of the compressor drops, it can run. Generally, it can quickly cool the compressor by pouring water. Then check the cause of its protection.

Low temperature protection: over current protection at extremely low ambient temperature (below -15 ℃): Starter fault tolerance; The system software is deficient and put into use for a long time; The working voltage is too low; Common faults of compressor.