When the refrigerator is not cooling, our first step is to check if the power lines are in good condition, see if the built-in light in the refrigerator is on, or use a multimeter for testing.

2. If there are no issues with the power lines, we then check if the compressor is operating normally. A functioning compressor emits slight motor vibrations. If the high-pressure output pipe in the compressor is damaged or the screws are loosely installed, the high-pressure pipe will not be empty. If the low-pressure pipe cannot vent air, it means the compressor is working but not cooling.

Solution: Open the casing, replace the new buffer tube, or tighten the screws.

3. If the compressor is operating properly, you can check if the refrigerant in the refrigeration system is depleted.

Judging Method: Operate the refrigerator for 3 to 5 minutes and then turn off the power. Ask if there is any water. When there is no sound, it means the refrigerant in the refrigeration system has been depleted. Additionally, the compressor may not be running.

4. Refrigerator capillary plug can also cause insufficient cooling: When the capillary tube inside the refrigerator is clogged, the cold water unit cannot enter the evaporator to absorb heat, resulting in a higher refrigerator temperature. Different refrigerator types have different cooling conditions. If it's a cold-only model that doesn't make ice, you can check if the refrigerator fan is working properly: Open the refrigerator door, press the button on the box edge (this button controls the off lights, stopping the fan when the door is open) to see if the fan is operating normally. If the fan doesn't work, it can also cause the refrigerator to cool improperly.

Solution: Capillary tube or desiccant blockage, the outlet is very hot. Please remove and replace it. Additionally, household refrigerators typically come in two types: Direct Cooling and Intermediate Cooling. Direct Cooling refers to the evaporator (cooling tubes) directly exchanging heat with the freezer and cooling compartments for cooling purposes. Intermediate Cooling means separating the evaporator (cooling tubes) from the freezing and cooling compartments, with fans blowing cold air into the freezer and refrigerator compartments to cool them.