The air conditioner is making a noise. It s noisy when it s cold, but when it s not cold, there s no

You can hear a humming sound, which means that the motor can still produce enough starting torque. It is also basically possible to determine that the starting capacitor is not bad (a simple way to judge the quality of the capacitor: if the fault is still replaced by the capacitor of the same model, the capacitance can be determined to be good, and it can also be measured with a multimeter).

The reasons why the compressor will not start are:

1. The pressure on the high-pressure side is too high;

2. The moving parts inside the compressor are stuck (commonly known as stuck cylinders).

The DC resistance of the internal motor of the compressor is very small, the starting current is very large, if it cannot be started, this large current will cause the line voltage drop to be too large, and the lights of the same network will be significantly darkened, and at the same time, this current will make the thermal protector of the compressor act, cut off the compressor motor circuit, the voltage of the same network will return to normal, and the brightness of the lamp will return to normal.

Judgment method: 1. The pressure on the high-pressure side is too high

a. Some maintenance personnel with insufficient ability fail to comprehensively evaluate and analyze the reasons for the general performance of the decline in the refrigeration (or heating) capacity of air conditioning, blindly supplement the refrigerant (refrigerant, freon), and cannot be quantitatively controlled due to the poor equipment, resulting in excessive system pressure. For air conditioners with a history of this type of maintenance, first drain some of the refrigerant and try to start the air conditioner.

b. The system is dirty or icy. Small air conditioners are generally throttled with capillaries. The capillary is preceded by a filter drier, which is more prone to "clogging".

c. Non-fault reasons: the high-pressure valve is not fully opened, and some non-professional air conditioners are moved to work.

2. Stuck cylinder: The cause is more complex, generally due to the lack of lubrication of the internal moving parts of the compressor and local overheating.

In addition, some non-fault reasons are that the grid voltage is too low, or the plug is not in good contact, etc.

When the air conditioner is not cooling, only the fan is moving, and when the air conditioner is cooling, the compressor also works. So first judge that the compressor is faulty. Then listen to see if the compressor is loose, if it is not loose, there is a problem in the compressor, and you must find a professional maintenance personnel to solve it.

If the air conditioner is not cooling and there is an abnormal noise, it could be one of the following reasons:

1.The air conditioner filter needs to be cleaned or replaced. If the air conditioner filter is clogged with dust and dirt, the air flow will be restricted, causing the air conditioner to not cool. At the same time, the air cracked celery filter may also cause abnormal noise.

2.The air conditioner condenser needs to be cleaned. If there is dust and dirt on the airconer's condenser, the heat cannot be dissipated, causing the aircon not to refrigerate. At the same time, the air conditioner condenser may also cause abnormal noise.

3.The air conditioner refrigerant is insufficient. If the aircon does not have enough refrigerant, the aircon will not refrigerate. At the same time, air conditioning refrigerant leakage may also cause abnormal noise.

4.The air conditioner compressor is faulty. If the aircon compressor fails, the aircon will not refrigerate and may make an abnormal noise.

First check whether the air conditioner is running normally, if there is no problem, then check the air conditioner's virtual filter, the air conditioner's refrigerant, fan, air conditioner's power, etc. one by one. Here's how:

1. First of all, check whether the air conditioner is running normally, and return the quiet message including the indoor unit and the outdoor unit, especially to check the compressor of the outdoor unit, as long as one of them is not running normally, then you have to contact a professional maintenance master for on-site maintenance.

2. Then check whether the filter screen of the air conditioner is too dirty, if the air conditioner starts normally, but it can't emit cold air, it is likely that the filter screen is too dusty and needs to be cleaned, it is recommended to clean it with a professional cleaning agent.

3. Check whether the refrigerant is insufficient, if it is insufficient, add it, and check whether there is air leakage in the cold circulation system, and if there is a gas leak, you have to make up for the leakage.

4. If none of the above can solve the problem, but the air conditioner can run normally, then check the operation of the air conditioner fan, if the air volume of the fan is very small, see if the fan motor is old, and replace it with a new fan motor. 5. If the ventilation pipe of the air conditioner is installed for a long time, it will lead to poor effect of transmitting indoor heat to the outdoors, so that the refrigeration is not obvious, and it is necessary to find a well-ventilated location to reinstall it and strive to shorten the ventilation pipe.

6. If the air conditioner is running normally, and all other leaky wheels are also in good condition, but the room does not feel the cold air, only to the air conditioner air vent to have cold air, considering that the power of the air conditioner is too small, it is recommended to replace the high-power air conditioner.

The air conditioner made an unusual noise. Why?

1.The blower is the "fan" of the air conditioning system. The air inside or outside the car is sucked into the blower by the rotation of the blower impeller and enters the air conditioning box under the action of centrifugal force.

By changing the input voltage of the fan, the speed section of the fan can be changed, and the air volume can be changed. So the sound is normal, don't worry. There is also the possibility that large leaves or other debris enter the fan blades and hit the debris as the blades turn.

This noise is not sharp, it is usually a "click". At this time, as long as the parts are opened and the foreign matter is cleaned up, there is no need to worry about the sound. Regular car washes are sufficient.

There is also a possibility that the blower is broken.

2.If it is woo, it may be that the air conditioner filter has not been changed for a long time, and there is too much dust on it, which is clogged, causing the wind to blow and not move. At this moment, the blower is whining, but the air volume is small, and the air conditioner is not cold.

If it's a squeak, it's not loud but a little sharp, so you can hear it clearly. At this time, it is necessary to consider whether the shaft is flooded or the lubrication grip is insufficient, and even whether the shaft itself is worn with punch, which can be heard clearly. At this time, it is necessary to consider replacing the blower and go to a professional maintenance place.

If the transmission belt is too loose, the electromagnetic clutch is easy to slip; If the transmission belt is too tight, the load on the electromagnetic clutch will increase. If the tension of the transmission belt is not suitable, the compressor will not work when it is light, and it will be damaged when it is heavy.

3.When the transmission belt is working, if the pulley of the compressor and the pulley of the generator are not on the same plane, the service life of the transmission belt or compressor will be reduced. The gap between the electromagnetic clutch and the compressor mounting surface is too large.

There should be a certain gap between the electromagnetic clutch and the compressor mounting surface. If the gap is too large, the impact will be greater. If the gap is too small, the electromagnetic clutch will interfere with the compressor mounting surface when working, which is also a common cause of abnormal noise.

There is a piston inside the compressor. When the piston moves, it pressurizes the refrigerant, causing it to liquefy. The movement of the piston causes friction, so it needs to be lubricated with refrigeration oil.

When the compressor lacks lubrication, the piston reciprocates, which will cause severe friction with the cylinder wall, generate heat, and even lock up. Compressors that lack lubricating oil inside will have a continuous and obvious metal friction sound when working. Wear and tear inside the compressor requires replacement of compressor components. Fixed.

It could be due to the following reasons:

1.The air conditioner is dry and the parts inside are loose or worn and need to be repaired or replaced.

2.Dust or foreign objects have accumulated inside the air conditioner, resulting in poor air circulation and need to be cleaned.

3.The refrigerant of the air conditioner is insufficient or leaking and needs to be added or repaired.

4.The air conditioner's fan or motor is faulty and needs to be repaired or replaced.

It is recommended to contact a professional air conditioner maintenance personnel for inspection and repair in time.

<> The reason for the abnormal sound when the air conditioner stops refrigeration: it may be because the gap between the piston and the cylinder wall is too large; The piston pin assembly is too tight or the connecting rod bearing is too tight, the gap between the tappet and its guide hole is too large, and the air distribution cam profile is worn; Or the starting grip is loose and makes the Yuqing pulley sound.

This answer is applicable to most of the air conditioning models of Haier, Gree, Midea and other former brands.

Abnormal noise in the air includes abnormal noise inside the air-conditioning system and abnormal noise outside the air-conditioning system.

Abnormal internal noise is mainly caused by noise inside the center console for the following reasons:

1.When the switch is turned on, the glove box makes a strange sound like running water. This is the air regulating expansion valve in working normally.

2.There is abnormal noise in the air duct of the air conditioner. The air filter element has not been replaced for a long time, and there are foreign objects such as leaves in the air duct.

Solution: Open the air conditioner link cover under the front passenger toolbox, wrap it in gauze, start the car, and blow out foreign objects when the fan is turned on to the maximum gear. Or the repair shop blows out foreign objects with a high-pressure air stream.

3.There is air or moisture in the refrigerant in the air compressor, and the refrigerant will make an abnormal sound when the refrigerant evaporates and expands.

Solution: Pump and replace the refrigerant. In addition, if the abnormal sound reappears after a period of time, and the sound is located inside the center console, the desiccant efficiency may be reduced.

If the condition remains unchanged after the refrigerant is replaced, and the abnormal noise is located near the compressor, the internal mechanical structure of the compressor is likely to be damaged.

Abnormal external noise is generally the abnormal noise of the empty compressor, which can be felt near the empty compressor of the engine.

1.There is a regular clicking sound in the engine part, and the throttle makes an abnormal sound after acceleration. Either the tensioner bearing of the naughty belt of the empty generator is faulty, or the tensioner loses the function of automatically adjusting the belt, resulting in abnormal noise.

Solution: Check the belt tensioner first. The belt is loose, adjust the tensioner spring. If the belt slips, the power drops significantly. It may be that the refrigeration system is leaking, and the compressor lacks refrigerant, which will increase the working resistance of the compressor and produce abnormal noise.

2.The air heat dissipation is not good, or the pipe base is slow and the internal pressure of the compressor is too high, resulting in abnormal noise of the compressor.

Solution: Clean or repair the air conditioning cooling system, or unclog the compressor piping.

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