1, refrigerator noise semiconductor refrigerator noise problem generally in the fan, the fan is a direct impact on the semiconductor refrigerator cooling effect, if the fan speed positioning, detail processing and other aspects do not do a good job, there will be a noise problem. Compressor refrigerator sound is certainly relatively large, but also in the compressor noise reduction technology to do a good job on the compressor refrigerator, compressor refrigerator first standard feature is a small noise. Found noise, first check the fan, fan aging noise naturally; secondly, check the compressor (if there is a compressor), compressor sound abnormal, you have to find the manufacturer to return to repair. Choose a low noise car refrigerator not only can improve the quality of life of car travel, but also can embellish the home bedroom taste, because the car refrigerator in addition to car, but also as a home refrigerator supplement, put in the bedroom, living room use. 2, not cooling For semiconductor refrigerator, first check whether the fan is running; second, check the product current. If close to 5 amps, you can safely say that the Parr paste components, PCB or insurance switch is not a problem; such as no current, check the PCB Parr paste components connected to the voltage. Then, if it shows 12V or higher, then the PCB and thermal fuse are good and it is recommended to replace the palletized components. If there is no voltage, check the fuse to determine if the PCB or fuse is bad. If all these aspects are checked and no problem, have to find the manufacturer to return to repair. Of course, to check these items, you must have the tools to do, no tools, only dry. Compressor refrigerator is not recommended to check in depth, because the compressor technology is more complex. 3, the machine has been cooling does not stop This situation mainly appears in the online shopping customers, because the online shopping mail, the courier company is not responsible, the thing fell badly, resulting in the box rupture, that is, the cold air has been leaking outward, the refrigerator has not been able to reach the intended temperature, only has been cooling. If the crack is not big, you can seal it by yourself with glue and other things. If the crack is too big, probably not scrap also have to find manufacturers to repair. So remind online shopping friends, the receipt of goods must be carefully checked, do not feel that in front of the delivery person to check his distrust, in fact, this is entirely for the protection of their rights and interests only. 4, power consumption unless it is to buy cheap products or imitation products, otherwise the regular brand of products in the design and production of the focus on the power consumption, generally not high to which. There is another reason is that the refrigerator does not have a low voltage protection device, the car off and forget to turn off the refrigerator power, the refrigerator has been working, but also has been using the car battery on the electricity, directly lead to start the car again, can not fire. It is recommended to buy a low-voltage protection device car refrigerator, or buy a voltage protection device, or parking after remember to directly to the refrigerator power off. 5, the actual temperature and display temperature does not match for the use of car refrigerator delivery of pharmaceutical preparations users, because of the high temperature requirements, in the official use of car refrigerator before, it is best to determine the temperature inside the box. But the measurement of the time to pay attention to, the refrigerator display temperature is not necessarily the same as the thermometer hanging temperature measurement, because the location of the measurement point is different. Just like the home refrigerator, the temperature of the door side and the temperature of the inside of the refrigerator is not the same.