A sudden extraneous sound in household appliances always causes alarm, especially when it comes to a refrigerator that operates around the clock. The situation when the refrigerator clicks during operationcan be caused by both absolutely normal physical processes and serious electrical circuit malfunctions. It is important not to panic, but to listen carefully to the nature of the sound and the frequency of its occurrence in order to correctly determine the source of the problem.
Often owners notice that clicks occur when the unit is turned on or off, but sometimes they can be repeated chaotically or follow at regular intervals. Understanding the mechanics of the compressor and auxiliary systems will help you distinguish normal operation from a harbinger of failure. In this article we will analyze in detail the main causes of sounds and methods for eliminating them.
Natural sounds of refrigeration equipment
You should not sound the alarm at the first sign of sound, as many models of modern equipment produce characteristic sounds during operation. If your the refrigerator clicks when turned on or turns off, this often indicates that the thermostat is working. The mechanical temperature sensor closes or opens the electrical circuit, and this physical contact is accompanied by a loud click that is heard throughout the entire body.
Another reason may be thermal expansion of materials. Internal plastic panels and metal structural elements may produce crackling sounds that resemble occasional clicks when the temperature changes. This is especially typical for new models or after defrosting, when the temperature difference inside the chamber is maximum. Thermal expansion It is not a defect and does not require specialist intervention.
However, if the sounds become louder, change in tone, or are accompanied by other symptoms, it is worth conducting a more in-depth diagnosis. A rare, single clicking sound at the moment of changing operating modes is considered normal, but not a series of frequent knocks.
Malfunctions of the starting relay and compressor
The most common technical reason why The refrigerator clicks and does not turn onis the failure of the starting relay. This small component is responsible for starting the compressor motor. If the relay is faulty, it may endlessly try to start the motor, making a series of loud clicks, after which the compressor hums for a few seconds and goes silent again.
Inside the relay there is a coil and contacts, which over time can burn or stick. When the contacts do not open in time, an overload occurs and the protective mechanism resets the circuit again, which we hear as a click. In some cases, the problem lies in the compressorcompressor itself, which is “jammed” due to exhaustion or lack of lubrication, and it physically cannot turn.
⚠️ Attention: If you hear a series of clicks, followed by a hum, and then another click and silence - immediately unplug the device. Continuing to operate in this mode can lead to burning of the motor windings and expensive repairs.
Diagnostics often require opening the casing at the bottom of the refrigerator (where the motor is located). A visual inspection of the relay for carbon deposits or melted plastic can provide an accurate answer. Replacing this element is a relatively inexpensive and quick procedure if the motor itself is not affected.
Problems with the thermostat and electrical circuit
The thermostat is the “brain” that decides when the refrigerator needs to cool the chamber and when to rest. If thermostat is faulty, it can randomly turn the compressor on and off, even if the temperature in the chamber has not yet reached the set values. This leads to frequent clicks and ineffective operation of the entire unit.
In addition, problems may lie in poor contact in the electrical circuit. Oxidized terminals or loose wires can spark, creating a characteristic crackling sound. It is important to check the integrity of the wiring going to the compressor and the light bulb. Sometimes vibration from a running motor gradually weakens the connections, which leads to sounds.
How to check a thermostat with a multimeter?
To check, you need to remove the thermostat and “ring” its contacts. When cold (if put in the freezer for 15 minutes), the contacts should close, and when warm, they should open (or vice versa, depending on the model). Lack of response indicates the need for replacement.
It is also worth mentioning defrosters (defrosting heating elements) in No Frost systems. If the defrost timer is stuck or acting up, it may make a clicking sound when trying to change operating modes. This requires checking the defrost control circuit.
Specifics of operation of refrigerators with the No Frost system
Owners of equipment with the No Frost system often encounter unique sounds that are absent in models with a drip system. Here the fan is responsible for air circulation, and the defrosting system is responsible for the absence of ice. Clicking noises can be produced by dampers that regulate the flow of cold air between the chambers.
If too much ice freezes in the evaporator (due to a loose door or a faulty sensor), the fan blades may touch the ice crust. This causes a rhythmic chirping or clicking noise that gets louder when the door is opened, when the fan would normally turn off. In such cases, defrosting refrigerator for a day often solves the problem temporarily.
| Sound type | Probable cause | Urgency of repair |
|---|---|---|
| Single click at start | Normal operation of the relay | Not required |
| Series of clicks, the motor does not start | Faulty start relay | High |
| Crackling sound when opening the door | The fan hits the ice | Medium |
| Chaotic clicks without cooling | Thermostat or electronics failure | High |
Fault diagnosis: step-by-step instructions
Before calling a technician, you can carry out an initial diagnostics yourself. This will help you more accurately describe the problem to a specialist or, perhaps, solve it yourself. Start by visually inspecting and listening to the unit in silence.
The first step should always be a complete defrost. Even if you have No Frost, leave the refrigerator turned off with the doors open for 24 hours. This will eliminate the problem of frozen ice and allow the system to thaw. If after turning on the clicks stopped, the problem was in the ice jam.
☑️ Primary diagnosis of noise
If defrosting did not help, pay attention to the installation level. An uneven floor can cause vibration, which is transmitted to internal parts and causes them to collide. Try rocking your body a little; if it wobbles, adjust the support legs.
When you need to call a professional technician
There are situations when self-repair is not only ineffective, but also dangerous. If after replacing the start relay (which requires electrical skills) the problem persists, it means that the control unit itself or the control unit is faulty. Replacing the motor is a complex process that requires evacuation of the system and refilling with freon. compressor or control unit. Replacing a motor is a complex process that requires evacuation of the system and refilling with freon.
It is also worth contacting specialists if the clicks are accompanied by a burning smell, heating of the housing in the area of the motor, or a complete absence of cold in the chambers. In modern models with electronic control, the cause may be a malfunction in the “brains” of the refrigerator, which can only be diagnosed with special equipment.
⚠️ Attention: Do not try to open the sealed circuit yourself or change the compressor without the appropriate equipment. This will lead to a refrigerant leak and the final failure of the equipment.
Remember that early contact with a technician often allows you to get away with replacing a cheap component (relay, thermostat), but ignoring the problem can lead to the need to replace an expensive compressor.
Is it worth repairing an old refrigerator?
If the refrigerator is more than 10-12 years old and the compressor needs to be replaced, it is more economically feasible to buy new equipment. The cost of work and spare parts can be up to 70% of the price of a new device, and the resource of other components (pipes, housing) will also be exhausted.
Prevention and proper care of equipment
To extend the life of your refrigerator and avoid the appearance of extraneous sounds, follow simple operating rules. Regularly check the cleanliness of the condenser (grids at the back), as dust impairs heat transfer and causes the compressor to work with overload, which accelerates wear on the relay.
Make sure the door is sealed. If the seal is dirty or damaged, warm air enters the chamber, causing the unit to operate more often. Wipe the seal with a soft cloth and check its fit. Also, do not place the refrigerator close to the wall, ensuring the necessary ventilation.
Compliance with temperature conditions and rules for loading chambers also affects durability. Do not place hot foods or overload shelves to avoid placing unnecessary stress on the structure and cooling system. A careful attitude is the key to quiet and long-term operation of your equipment.
Why does the refrigerator click but does not freeze?
This is a classic sign of a faulty start relay or compressor. The relay tries to start the motor, a click is heard, but the motor does not start and no cold is produced. Diagnostics of the electrical part is required.
Is it dangerous to continue using the refrigerator if it clicks?
If there are single clicks and there is cold, most likely not. But if a series of clicks is interrupted by a buzzing sound and there is no cold, operation is dangerous: the compressor may burn out or a fire hazard may arise due to overheating of the wiring.
Is it possible to replace the start relay yourself?
Technically, yes, if you have skills in working with electricians and tools. However, it is important to choose the right relay model for a specific compressor. An error in selection can lead to repeated breakdown.
Does a voltage surge affect the appearance of clicks?
Yes, voltage surges can damage the relay contacts or the electronics of the control unit, which will lead to incorrect operation and the appearance of sound signals. It is recommended to use a voltage stabilizer.