Refrigerator compressor maintenance case

Refrigerator compressor maintenance case Case description: The repair is a Refrigerator 220 direct-cooled refrigerator, which starts after the contact is stuck, causing the refrigerator compressor to start normally and sometimes abnormally.

　　Faulty refrigerator analysis: The compressor can start smoothly when the refrigerator is normal, and the humidity of the freezer and refrigerator is also in the normal range. When the refrigeration temperature is reached, the machine is turned on again. Sometimes it can't start normally, the thermal protector will act after about 10 minutes. Stop and start again for about 3 minutes. Sometimes it can be started, sometimes it cannot be started.

　　According to this failure analysis, it may be that the starting relay has poor contact, but it does not rule out the compressor. First, use a multimeter R×1 to measure the resistance value between the two jacks of the starting relay (unable), and turn the starting relay 180°. After that, the resistance value (connected) is normal, and the test confirms that there is no problem with the starting relay. It is normal to measure the resistance value of the compressor starting and running winding. Test the machine with the backup start relay, the compressor starts to run normally. Use a screwdriver to pry open the shell of the original relay, and see that the two contacts are black and oxidized. Polish the two contacts with fine sandpaper, and then stick the shell firmly with glue. Put it back on the compressor and power on the test machine. It has been working for several months without failure. . The cause of such failures is often caused by the sudden rise and fall of the city's electricity supply in the region.

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