Analysis and Repair: Based on the fault symptoms, it can be judged that the temperature control section has failed. Remove the rear cover, take out the control circuit board, and unplug a plug on the left. This plug is connected to the thermistor PTC of the secondary evaporator temperature sensor inside the refrigerator. Use a multimeter to measure the resistance value of this resistor, which is less than 15kΩ, causing the fault of the compressor not stopping. Most Siemens refrigerators use relatively advanced electronic temperature controllers. Due to the harsh working environment of the thermistor that senses the temperature inside the refrigerator, it is prone to change in value or damage after long-term use, which causes the electronic circuit to fail to work properly, making the compressor run continuously.
Remove the temperature sensing element on the secondary evaporator inside the refrigerator, take out the filler and the damaged thermistor PTC inside the temperature sensing element. Place a Shanghai-made negative temperature coefficient thermistor (2.7～3.0kΩ/25℃) into the temperature sensing element, lead out the wires, fill with filler, restore and install it properly, and the refrigerator will function normally.
Siemens Refrigerator Compressor Runs Continuously Without Stopping
Fault Phenomenon: The Siemens refrigerator compressor runs continuously without stopping, and the temperature inside the refrigerator compartment has already dropped below zero degrees Celsius.
Article Source: Beijing Siemens Refrigerator After-sales Service Phone http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3465253.