The causes and solutions of air-cooled refrigerator not cooling:
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1, open the cold room door, see whether the light in the box is bright, to determine whether the power of the refrigerator is connected. If the light is off, use a pen or multimeter to check whether the power socket is powered on and whether the power plug of the refrigerator is properly connected.
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2, the alarm indicator light, while the buzzer alarm sound. Possible causes: Generally due to the high temperature of the freezer, there are the following cases :1) the first boot or a long time after power off and then boot; 2) Open the freezer door for a long time; 3) Put a large amount of food in the freezer at one time; 4) Air-cooled refrigerator, when the refrigerator door is not good or the user opens the door for a long time will also produce an alarm. Processing method: click the memory key to cancel the alarm sound; Close the freezer door; Don't put too much food in at once.
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3, use a multimeter to check whether the power supply voltage is lower than 187 volts, because the normal use voltage of the refrigerator according to the national standard is 187V-242V (unless otherwise stated by the manufacturer), the compressor of the refrigerator is not effectively started normally.
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4, when the ambient temperature is lower than the normal starting temperature of the temperature controller, check whether the refrigerator's low temperature switch is open. Only by opening the low temperature switch can the temperature controller be forcibly turned on.
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5, the refrigeration system works, but the cold room light is not bright. Possible cause: The light bulb is broken. Treatment: Replace the bulb.
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6. Standing water at the bottom of the freezer or Vita crisper. Possible cause: The drain hole on the sink under the back wall of the cold room may be blocked by dirt. Treatment method: Clean up the dirt in the drainage hole on the sink.
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7, the high pressure output buffer tube in the compressor is broken, or the screw fixing the tube is loose, resulting in the high pressure tube is not vented, the low pressure tube is not aspirated, so the compressor is running, but not cooling. Treatment method: cut the shell, replace the buffer tube, or tighten the screw.
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8, the refrigeration system leaks, the refrigerant all runs out, the compressor is running, but there is no refrigerant evaporation and heat absorption in the system, so the temperature in the refrigerator does not fall. Treatment method: First find out the leakage part of the system, weld repair, pressure test, evacuate qualified, add refrigerant to a certain amount, usually according to the evaporator frost or the rated temperature in the refrigerator.
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9. The capillary is blocked, the refrigerant cannot enter the evaporator to evaporate and absorb heat, and the temperature in the refrigerator does not drop. Treatment method: The capillary or dryer is blocked, and the outlet is heated, for this reason, it should be removed! In addition, the household refrigerator generally has two kinds of direct cooling and inter-cold, direct cooling refers to the evaporator (cooling tube) directly with the freezing, cold room for heat exchange to achieve the purpose of cooling; Intercooling means that the evaporator (cooling tube) is separated from the freezer and cold room, and the cold air is blown into the freezer and cold room by a fan to achieve the purpose of cooling.
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10, the refrigerator is not refrigerated and makes strange noises: check whether there is an oil plug in the evaporator, and the reason for the oil plug is the poor quality of the refrigerated oil. Some refrigerators are equipped with two evaporators, both of which are aluminum plate printing, the refrigerant channel on which there are a number of parallel, but the quality of the refrigerant oil is not good, mixed with impurities in the refrigeration system, it will be blocked in part of the parallel pipeline, resulting in a decrease in refrigeration efficiency, and usually rarely add frozen oil, and the accumulation of oil itself due to the evaporation of the refrigerant and churn, emit \"grum\". Noise. Treatment method: cut off the compressor process pipe, discharge the refrigerant in the system, connect the three-way repair valve on the process pipe, and connect the vacuum pump: disconnect the high-pressure exhaust pipe on the compressor, and connect the nitrogen cylinder with the pressure reducing valve in the condenser inlet pipe, start the vacuum image, open the repair valve and the chlorine cylinder valve, so that the low pressure pressure to maintain a certain vacuum degree, so that nitrogen → condenser → dry filtration Apparatus → Capillary → evaporator.