What's wrong with the air conditioner not defrosting? Analyze common causes and solutions
Recently, the use of air conditioners has become one of the hot topics on the Internet, especially the phenomenon of "air conditioners not defrosting" has attracted widespread attention. In high-temperature weather in summer, the cooling effect of air conditioners directly affects user experience, and abnormal defrosting functions can lead to reduced cooling efficiency or even equipment damage. This article combines hot discussion data in the past 10 days to provide you with a detailed analysis of the reasons and solutions for air conditioners not defrosting.
1. Statistics of hotly discussed topics related to air conditioner failures across the Internet (last 10 days)
| hot topics | amount of discussion | main focus |
|---|---|---|
| Air conditioner suddenly stops cooling | 128,000 | Fluoride deficiency/filter clogged |
| Air conditioner internal unit leaks | 93,000 | clogged drain pipe |
| Air conditioner not defrosting | 65,000 | Defrost sensor failure |
| Abnormal noise from air conditioner | 52,000 | Fan bearing wear |
| Air conditioning power consumption surges | 47,000 | Compressor aging |
2. Five core reasons why the air conditioner does not defrost
According to data from the home appliance repair platform, the problem of air conditioners not defrosting is mainly caused by the following factors:
| Cause of failure | Proportion | Typical symptoms |
|---|---|---|
| Defrost sensor failure | 38% | Does not enter defrost mode at all |
| Four-way valve cross-gas | 25% | Frost continues to form on the outdoor unit during heating |
| Insufficient refrigerant | 18% | Partial frost on evaporator |
| Motherboard control abnormality | 12% | Defrost cycle disorder |
| Ambient temperature is too low | 7% | Difficulty starting when the temperature is below -5℃ |
3. Targeted solutions
1.Defrost sensor fault detection: Use a multimeter to measure the sensor resistance. The normal range should be 5-15kΩ (25°C environment). If the deviation exceeds 30%, it needs to be replaced.
2.Four-way valve inspection: Listen to see if there is commutation sound when the compressor is running, test the coil resistance (usually 1.5-2kΩ), and replace the valve body if necessary.
3.Refrigerant replenishment: Check the low-pressure side pressure through a pressure gauge. The normal value of R22 refrigerant is 0.4-0.6MPa. If it is insufficient, check for leaks and charge quantitatively.
4.Motherboard diagnostics: Observe the status of the defrost indicator light and use a diagnostic instrument to read the fault code. Common E4/E5 codes indicate that the defrost system is abnormal.
4. User self-examination step guide
| steps | Operation content | Judgment criteria |
|---|---|---|
| first step | Check the frost on the outdoor unit | Uniform and thin frost is normal, and lumpy ice is abnormal. |
| Step 2 | Monitor defrost operation sound | There should be obvious air flow sound and defrost drainage |
| Step 3 | Record defrost intervals | Normally 40-90 minutes/time |
| Step 4 | Measure the air outlet temperature | When heating, it should be >40℃ |
5. Preventive maintenance suggestions
1. Clean the outdoor heat exchanger regularly, at least twice a year, to prevent dust from affecting the heat exchange efficiency.
2. Keep the power on during winter use to avoid condensation water freezing and damaging components after shutting down.
3. When not in use for a long time, the power supply should be cut off, the accumulated water in the pipe should be drained, and a dust cover should be put on.
4. Pay attention to the latest industry trends: Gree recently launched the "Smart Defrost 3.0" technology, which can extend the defrost cycle by 60% through AI algorithms. The number of user complaints of related models (such as the Calm King series) has dropped by 78% compared with the old model.
Summary: The problem of the air conditioner not defrosting needs to be judged based on the specific phenomenon. It is recommended to prioritize the sensor and refrigerant conditions. If self-treatment does not work, you should contact the official after-sales service in time to avoid misoperation and magnifying the fault. According to JD.com’s service big data, the recurrence rate of such problems can be controlled below 5% after professional repairs.
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