During the operation of the high and low temperature coolant testing machine, sometimes the compressor will be hot. This not only affects the normal operation of the device, but also may cause damage to the device. This paper will analyze this problem in detail, and put forward the corresponding troubleshooting methods to help users better solve such problems.

　　First, failure cause analysis

　　1, insufficient refrigerant: When the refrigerant is insufficient, the compressor needs to consume more energy to complete the cooling task, resulting in hot compressor.

　　2, poor heat dissipation: If the heat dissipation system of the equipment has problems, such as radiator blockage, fan failure, etc., it will lead to the heat generated by the compressor can not be dispersed in time, resulting in the compressor hot.

　　3, compressor overload: if the compressor is overloaded for a long time or encounters too high cooling demand, it may lead to overload, and then lead to hot phenomenon.

　　4, electrical failure: such as compressor motor coil short circuit, loose wiring terminals and other electrical failures, may also cause the compressor hot.

　　5, mechanical failure: such as piston wear, valve leakage and other mechanical failures, will affect the normal operation of the compressor, resulting in hot.

　　Three, troubleshooting methods

　　1, check the refrigerant: If you find insufficient refrigerant, you should add enough refrigerant in time. At the same time, it is also necessary to check whether there is leakage in the refrigeration system, and if there is leakage, it should be repaired in time.

　　2, clean the heat dissipation system: regularly clean the dust and dirt on the surface of the radiator to ensure the heat dissipation effect of the radiator. At the same time, check the working status of the fan to ensure its normal operation.

　　3, adjust the operating parameters: according to the actual cooling needs of the equipment, adjust the operating parameters of the compressor to avoid long-term overload operation. During the operation of the equipment, it is also necessary to pay close attention to the operating status of the compressor to ensure that it is not loaded.

　　4, check the electrical system: regularly check the compressor motor coil, wiring terminals and other electrical components to ensure that the connection is good and no short circuit phenomenon. If an electrical fault is found, repair or replace the relevant parts in time.

　　5, check the mechanical parts: regularly check and maintain the piston, valve and other mechanical parts of the compressor to ensure that they are in good working condition. If mechanical failure is found, repair or replace the relevant parts in time.

　　6, strengthen maintenance: Regular maintenance of high and low temperature coolant testing machine, including replacing lubricating oil, cleaning filters, etc., to ensure the normal operation of the equipment and extend the service life.

　　7, improve the skills of operators: strengthen the training and learning of operators, so that they are familiar with the equipment operating procedures and common troubleshooting methods. When problems such as compressor burning are found, measures can be taken quickly to eliminate them.

　　8. Establish fault records: record and analyze all kinds of faults that occur during the operation of the equipment, so as to summarize experiences and lessons in time and improve the level of equipment maintenance and management.