The situation when a household appliance suddenly begins to make loud clicks scares many owners. This sound can be single, repeated, or accompanied by attempts by the unit to start, which are never successful. Often it is the clicks that become the first bell, foreshadowing a serious breakdown, but in some cases they are part of the normal operating mode of the equipment. Understanding the nature of these sounds allows you to quickly react and, possibly, avoid expensive repairs. refrigerator suddenly starts making loud clicking noises, scaring many owners. This sound can be single, repeated, or accompanied by attempts by the unit to start, which are never successful. Often it is the clicks that become the first bell, foreshadowing a serious breakdown, but in some cases they are part of the normal operating mode of the equipment. Understanding the nature of these sounds allows you to respond quickly and possibly avoid costly repairs.
In this article we will analyze in detail the mechanics of operation refrigeration compressor and related components so that you can independently determine the source of the noise. We will look at both the electrical components and the physical processes occurring within the system. It is important not to ignore repeated clicks, especially if they are accompanied by a lack of cold in the chambers.
Is a clicking sound normal when starting and stopping the engine
Before sounding the alarm, you should understand that no complex equipment works absolutely silently. At the moment of switching on or off compressor inside its electrical circuit, contacts open or close. This process is physically accompanied by a characteristic sound, which is often described as a slight click. If your unit makes such a sound exactly once at the start of the cooling cycle and once at its completion, and the cold remains inside the chambers, then most likely everything is in order with the machine.
However, the nature of the sound may vary. The standard click is usually dull and quiet. If you hear a ringing, metallic clang or a series of rapid, repeated clicks, this is already a signal of a problem. You should be especially wary if the refrigerator clicks and does not turn onand the engine only hums for a couple of seconds and then goes silent again. This is a classic symptom of an attempt to start, which fails due to a malfunction of the starting mechanism or problems with the motor windings.
It is also worth considering the case material and internal design. When the temperature changes, plastic parts may expand or contract, producing a cracking, clicking sound. This is especially true for models with a No Frostsystem, where temperature changes are sharper. But if the sound clearly comes from the engine compartment at the bottom of the rear wall, we are talking about the electrics or mechanics of the compressor.
⚠️ Attention: If the clicks are accompanied by a burning smell, a buzzing sound that lasts less than 5-10 seconds, or a complete lack of cooling, use of the equipment must be stopped immediately. Further switching on can lead to the final failure of the expensive compressor.
Failures of the starting relay and thermostat
One of the most common reasons the refrigerator clicksis the failure of the starting relay. This small but critical element is responsible for supplying voltage to the starting winding of the engine at the moment of start. Inside the relay there is a coil and a movable core, which, when current is applied, produce that same click. If the mechanism sticks or the contacts burn out, the clicks become frequent, and the motor cannot gain the required speed.
The second suspect in this chain is thermostat (thermostat). It is he who gives the command to turn the compressor on and off. When its contact group wears out, sparking and a characteristic cracking sound may occur. In modern models with electronic control, the role of a thermostat is performed by a temperature sensor and a control module, but the principle remains the same: poor contact leads to noise and unstable operation.
Diagnostics of these components requires caution. Before checking, be sure to disconnect the device from the mains. Visually inspect the wires for melting. If you have skills with a multimeter, you can “ring” the relay and thermostat contacts for resistance. Often the problem is solved by simply replacing the starting relay, the cost of which is low, and even an inexperienced technician can install it.
How to check the starting relay without instruments?
Shake the removed relay near your ear. If something rattles loudly inside (like a dry seed in a fruit), it means that the mechanism is destroyed and requires replacement. A working relay should make only a slight knocking sound when tilted.
Problems with the compressor: interturn short circuit
The most serious and expensive cause of clicking is a malfunction of itself compressor. When a series of clicking sounds is heard, followed by a humming noise and then cutting out, this often indicates a turn-to-turn short in the motor windings. In this case, the starting relay regularly tries to start the motor, the current increases sharply, and the thermal protection relay breaks the circuit, making a click. The cycle is repeated until the wiring or the compressor itself burns out.
This problem can be determined by the characteristic behavior of the equipment. The motor heats up more than usual, and clicks occur with enviable frequency (every few minutes). In such a situation, independent repair is impossible: the compressor needs to be replaced, which is a complex procedure that requires evacuation of the system and refilling refrigerant (freon). The cost of such repairs is often comparable to buying a new refrigerator.
It is also important to check the voltage in the network. If your home network experiences severe power surges, the compressor may behave erratically, clicking and shutting down. The use of a voltage stabilizer in such cases is a mandatory requirement for the longevity of your equipment.
| Symptom | Probable cause | Difficulty of repair | Necessary actions |
|---|---|---|---|
| Single click at start/stop | Normal relay operation | Not required | Observation |
| Series of clicks, motor hums and turns off | Compressor jammed or short circuit | High | Call a technician, replace the motor |
| Frequent clicks, there is cold | Malfunction of the thermostat or starter | Medium | Replacing the relay or thermostat |
| Crackling inside the chamber | Thermal expansion of plastic | Not required | Norm for No Frost |
The influence of the No Frost system on the sound background
Owners of refrigerators with an automatic defrosting system No Frost often encounter clicking noises that are not associated with the operation of the compressor. In such models, fans are responsible for air circulation, and heating elements (heating elements) are responsible for moisture removal. When the defrosting heating element is turned on or when the damper that regulates the flow of cold air is operating, characteristic sounds resembling clicks or crackling noises may occur.
These sounds are especially noticeable at the moment when the refrigerator switches from cooling mode to defrosting mode. Mechanical dampers Air Control can move jerkily, creating noise. If clicks come from the top of the freezer or from behind the back panel, and the unit itself freezes perfectly, then this is most likely the operation of the automation. However, if the sound becomes too loud or metallic, a foreign object may have entered the system or the fan may have iced up.
Sometimes clicking noises in the No Frost system are associated with deformation of the plastic parts of the air ducts due to temperature changes. Over time, the plastic “gets tired” and begins to react to heat with louder sounds. Lubricating the rubbing parts or replacing the plastic elements of the air duct can solve the problem if the noise begins to irritate.
Diagnostics and step-by-step check with your own hands
If you decide to carry out the initial diagnosis yourself, act strictly according to the algorithm so as not to aggravate the situation and not get an electric shock. The first step should always be to completely unplug the appliance. Only after this can you begin visual inspections and manipulation of parts.
Start by inspecting the back of the refrigerator. Remove the compressor's protective cover (usually held in place by clips or a few screws). Inspect the wires: there are no signs of melting, rodents or mechanical damage. Check whether the compressor itself is securely attached to the shock absorbers. Sometimes vibration is transmitted to metal tubes, creating a rattling sound that can be mistaken for clicks.
If no visual defects are found, you can try carefully (with the power turned on, using extreme caution!) to listen to where exactly the sound is coming from. Use a long screwdriver like a stethoscope: place the handle on your ear and the tip (without touching any moving parts!) on various parts. This will help localize the source: is the relay clicking, is the motor humming, or is the plastic cracking?
☑️ Primary diagnostic checklist
⚠️ Attention: It is strictly forbidden to touch the copper tubes and electrical contacts of the connected network refrigerator with wet hands or metal objects. 220V voltage is dangerous to life!
When you need to call a professional technician
Despite the desire to save money, there are situations when An attempt at self-repair can lead to a freon leak and complete failure of the system. If diagnostics have shown that the problem lies in the compressor itself (interturn short circuit, jamming of the piston group) or in the refrigerant circulation circuit, you cannot do without special equipment.
It is also worth contacting specialists if after After replacing the start relay, the situation did not change. This suggests that the reason lies deeper. A professional technician has instruments for measuring winding resistance, system pressure and consumption currents, which allows an accurate diagnosis to be made. In addition, service centers provide a guarantee on work performed and components replaced.
Do not forget that modern refrigerators are full of electronics. Inept interference with the work control module can lead to failures in the program, which will have to be corrected by flashing or replacing the board, which is much more expensive than repairing the mechanical part.
Preventing noisy operation and extending service life
In order for your refrigerator to operate quietly and for a long time, it is important to provide it with the correct operating conditions. First of all, it is a smooth and stable installation. If the unit is skewed, the compressor experiences increased loads, which leads to accelerated wear of the bearings and the appearance of noise. Adjust the legs so that the refrigerator stands solidly.
The second important aspect is the cleanliness of the condenser. The black grille located at the back (or hidden in the plinth) should be freely washed by air. Dust and pet hair clogged the condenser causes the compressor to overheat. The motor tries to compensate for the inefficiency by running longer and louder, and the starting currents increase, increasing the load on the relay. Vacuuming every six months is a great habit.
Also keep an eye on what you put into your cameras. Do not place hot food as this forces the compressor to work at its limit. Sudden temperature changes inside the chamber also contribute to plastic deformation and cracking. Following simple rules of operating hygiene will help to avoid many technical problems.
Why does the refrigerator click but does not freeze?
This is a classic sign of a malfunction of the start relay or the start relay itself compressor. The relay clicks, trying to start the engine, but due to a breakdown, the start does not occur, and no cold is produced. Diagnostics of the motor group is required.
Is it possible to continue using the refrigerator if it clicks?
If there are single clicks and there is cold, then you can. If the clicks are frequent, accompanied by a buzzing sound and lack of cooling, it is better to turn off the device before the technician arrives, so as not to burn the wiring.
How much does it cost to replace the starting relay?
The relay itself is inexpensive (usually from 500 to 1500 rubles depending on the model), but if you call a technician, you will also have to pay the cost of a visit and work, which in total can amount to a significant amount.
Does unstable voltage in the network affect clicks?
Yes, with low or jumping voltage, the compressor does not have enough power to start, the relay constantly turns on and off, making clicking sounds. It is recommended to use a stabilizer.