The unexpected appearance of a loud chirping sound in the refrigerator often takes owners by surprise. If previously the equipment worked almost silently, then sharp clicks or a trill, reminiscent of the chirping of a grasshopper, cause understandable anxiety. Such a sound can be either a sign of the natural operation of the equipment or a signal of a serious malfunction.
The intensity and nature of the noise depend on many factors, including the model of the unit, its age and operating conditions. In this article, we will look in detail at why refrigerator it begins to make extraneous sounds, which components require immediate attention, and whether it is possible to fix the problem yourself. Understanding the source of the sound is the first step to a successful repair.
Modern cooling systems use various mechanisms, each of which has its own acoustic characteristics. Inverter compressor, for example, works differently than a classic linear one, and the sounds it makes may be unfamiliar to a user accustomed to old equipment. Let's look at the main reasons for the appearance of crackling.
Natural sounds of the cooling system
Crackling or chirping does not always indicate a breakdown. Often these sounds are part of the normal operating cycle. Many users are frightened by loud clicks that occur when starting or stopping the engine, but in most cases this is the normal operation of protection relay or the starting device.
The movement of refrigerant through the tubes can also be a source of sound. If the system uses freonwhich, under certain conditions, changes from a liquid to a gaseous state, a characteristic gurgling or hissing noise may occur, which is sometimes perceived as a crackling sound. This is especially noticeable in models with No Frostwhere air flows create an additional acoustic background.
It is important to consider that new refrigerators may “sound” louder than old ones due to a more efficient, but less noise-insulated compressor design. If the sound is not accompanied by a failure of the equipment to cool, it is too early to panic.
⚠️ Attention: If the chirping is accompanied by a burning smell, smoke or a complete lack of cold, immediately unplug the device. Operating faulty equipment is dangerous.
Faulty compressor start relay
One of the most common reasons why a refrigerator chirps is a failure of the start relay. This small element is responsible for starting the engine compressor. When the relay wears out or burns out, it begins to emit a characteristic dry crackling sound, similar to the chirping of insects.
Symptoms of such a malfunction usually appear cyclically. You hear a click, followed by a series of rapid clicks (chirping), followed by a loud bang and the refrigerator goes silent without starting to operate. After some time, the cycle repeats. This means that the motor is trying to start, but the relay cannot provide the necessary impulse.
Replacing the start relay is one of the few procedures that you can do yourself if you have basic skills. However, it is important to choose the right part, since different models Indesit, Atlant or Beko use different types of relays.
How to test the relay at home?
Take the relay in your hand and shake it. If a distinct ringing sound is heard inside (as if from a loose nut), it means that the contacts or mechanism are damaged and the part requires replacement. A working relay should not rattle.
Problems with the fan in the No Frost system
In refrigerators with the system No Frost the fan is responsible for air circulation. If the refrigerator makes sounds that resemble a grasshopper's trill or an intermittent hum, the problem may lie in this particular unit. The fan blades may touch frozen ice or a foreign object.
Often the reason lies in wear of the bearings or bushings of the fan motor. Over time, the lubricant dries out and the rotating parts begin to rub against each other, creating high-frequency noise. In some cases, the blades become deformed due to time or improper defrosting.
For diagnostics, you need to remove the back panel in the freezer. Be careful: before checking the electrical part, be sure to unplug the device from the outlet. Check whether the impeller rotates freely and whether there is ice on it.
- 🔧 Freezing: A common reason is that water from the drainage gets onto the fan and freezes, blocking rotation.
- 🌪️ Wear of bushings: Plastic bushings wear out over time, backlash and characteristic noise appear.
- ❄️ Icing of the evaporator: If the defrost system does not work, ice builds up on the evaporator and touches the fan.
Vibration and contact with structural elements
Sometimes the source of sound is trivial - vibration. If the refrigerator is not installed level or the fasteners are loose, the cabinet may resonate, creating a rattling noise. However, a more specific “chirping” sound often occurs when vibrating tubes condenser or the compressor itself touch metal parts of the housing or each other.
During operation, the motor-compressor creates vibration. If the rubber shock absorbers (dampers) under the compressor dry out or move, the metal casing begins to hit the tubes. The sound is very similar to the work of a grasshopper or a metal clang.
It is also worth checking the distance between the back wall of the refrigerator and the wall of the room. If the gap is too small, vibration can be transmitted to building structures, increasing the noise.
Table: Diagnostics by type of sound and symptoms
To quickly determine the cause of the malfunction, use the table below. It will help to compare the nature of the sound with the probable breakdown.
| Sound type | Probable cause | Associated symptoms | Difficulty of repair |
|---|---|---|---|
| Dry crackling sound at startup | Malfunction of the start relay | The refrigerator does not cool, knocks out plugs | Low |
| Constant whirring | Fan No Frost (ice/wear) | Noise in the freezer, ice on the back wall | Average |
| Metal clanging/ringing | Vibration of tubes against the body | The sound changes when you press the tubes | Low |
| Intermittent humming | Wear of the compressor | Weak cooling, heating of the side walls | High |
Diagnostics by sound allows you to roughly understand where to look. However, an accurate diagnosis can only be made by a specialist using specialized equipment, for example, a tester for checking motor windings.
⚠️ Attention: If you do not have experience working with electrical appliances and do not know how to safely check the integrity of the electrical circuit, do not disassemble the compressor compartment. High voltage is life-threatening.
Wear of the compressor: when replacement is needed
The most unpleasant scenario is wear of the compressor itself. motor compressor. If the internal mechanical parts of the engine (piston group, valves) are worn out, it begins to operate with increased noise. The sound may be uneven, with a metallic knock or crackling sound.
Often, when the compressor wears out, a drop in performance is observed. The refrigerator runs almost non-stop, trying to get the temperature up, but it can't do it. In this case, the chirping is a “cry for help” of the dying unit.
Replacing a compressor is a complex and expensive process that requires evacuation of the system and refueling freon. It is almost impossible to perform this operation independently without a special tool.
Checking and troubleshooting: step-by-step algorithm
If you decide to try to eliminate the noise yourself, act consistently. First, rule out simple causes, such as improper installation or contact with foreign objects.
Then move on to more complex diagnostics. You will need a multimeter to test the relay and fan. Test the relay contacts for shorts or opens.
Be careful when working with internal components. Plastic in old refrigerators becomes brittle and easily breaks if handled carelessly.
☑️ Primary diagnostic checklist
After all the manipulations, assemble the refrigerator and turn it on. Observe the work for several hours. If the noise disappears and the cold appears, the problem is solved.
Frequently asked questions (FAQ)
Can chirping be a sign of a freon leak?
Chirring itself rarely indicates a leak. A freon leak usually does not make a sound. However, if, due to a leak, the compressor begins to idle or switches on/off frequently, this can lead to its overload and the appearance of extraneous noise from the relay or motor.
How much does it cost to replace the start relay?
The cost of the part itself is relatively low and depends on the model of the refrigerator. However, if you call a specialist, the main part of the amount is the cost of work and travel. Replacing the relay yourself costs the price of the part.
Is it dangerous to continue to operate a whirring refrigerator?
If the sound comes from the start relay and the refrigerator does not turn on, further attempts to start may lead to burnout of the compressor windings. If the fan is whirring, this can lead to icing of the evaporator and failure of the defrost system. It’s better not to delay repairs.
Why did the old refrigerator begin to make more noise?
Over time, the grease in the bearings dries out, the rubber gaskets harden, and the fasteners weaken. All these natural aging factors lead to increased noise and vibration, even if the main components are in good order.