Repair measures: Separate the three contact points that were stuck together, and polish them with fine sandpaper. Reinstall and test the machine. The refrigerator runs normally, and the fault is eliminated.
Analysis and Repair: Upon observation after turning on the machine, it was found that the defrost timer motor would stop rotating after working for about 20 minutes each time it started, and the temperature in the freezer compartment remained at around 1℃. Since this fault has a periodic nature, it was suspected that there was an issue with the defrost circuit. After opening the rear cover of the freezer compartment, the resistance of the defrost heater was measured to be 350Ω using a multimeter, and the resistance of the defrost timer motor coil was 8kΩ, both of which were normal (Haier Hisense refrigerator repair in Beijing). Further measurements were taken on the continuity of the tea-colored, red, and black wiring terminals on the defrost timer, and it was discovered that these three terminals were connected to each other. Upon inspection, it was found that the three terminals were stuck together (Beijing Haier Hisense Refrigerator Repair Center). Due to the connection between the three terminals, after the refrigerator had been cooling for a period of time, the defrost thermostat would connect, short-circuiting the defrost timer motor coil, causing the defrost timer to stop working. At the same time, since the defrost heater is connected in parallel with the compressor, while the refrigerator cools, the defrost heater continuously generates heat, preventing the freezer compartment from reaching the set temperature and causing the compressor to run continuously without stopping.
Fault Symptoms: The refrigerator compressor runs continuously, and the internal temperature does not reach the set value.
Beijing Haier Refrigerator Repair Phone After-sales Service Information.
Haier Refrigerator Repair Information: Compressor runs continuously, unable to reach the set temperature.