Constant extraneous sound in the kitchen often becomes a source of irritation, especially if it is a rhythmic knocking that disturbs the peace. When the refrigerator clicks, this symptom cannot be ignored, since it can signal either a harmless failure in the control system or a critical breakdown of the motor. In most cases, a characteristic click is heard when an attempt is made to start the engine or when it stops, which narrows the scope of troubleshooting to the electrical part of the unit.
Primary diagnosis requires careful listening to the device to determine the exact source of vibration. The sound may come from the bottom of the housing where the compressor is located, or from the temperature sensor area inside the chamber. Understanding the nature of the noise - be it a mechanical shock, electrical crackling or a relay click - is a key step before deciding to call a technician or do the repair yourself.
In this article we will examine in detail the main causes of clicking, methods for eliminating them, and situations when the operation of equipment becomes dangerous. You will learn how to check the start relay, why the compressor may hum and knock, and in what cases a complete replacement of the unit will be required. A competent approach to diagnostics will help save budget and extend the life of household appliances.
The principle of operation of the start relay and the reasons for clicking
The most common reason why a refrigerator makes clicking sounds is a malfunction start relay. This small electrical component is responsible for supplying voltage to the motor windings when it starts. When you hear a loud click followed by a buzzing sound and then silence, this is a classic sign that the relay is trying to start the motor but is unable to do so.
Inside the relay body is a coil and a movable core that, when current is applied, creates a magnetic field and closes the contacts. Over time, the contacts may oxidize or burn, and the spring may lose its properties. As a result, the device emits a characteristic metallic click every time you try to turn it on, but the circuit does not close properly and the compressor does not start.
The breakdown can be determined by external signs: if after the click the motor does not start for several seconds, and then a second click is heard to disable the protection, the problem lies in this particular unit. Sometimes the relay can get stuck in the closed state, which leads to continuous operation of the engine without the possibility of stopping, which is also dangerous for the windings.
⚠️ Attention: If after the click you smell a burning smell or see sparking in the compressor area, immediately unplug the refrigerator. Operation of a faulty relay can lead to a wiring fire or complete combustion of the motor.
It is important to understand that the starting relay is selected strictly for the compressor model. Installing an unsuitable element may result in unstable operation or repeated failure. Modern models often use solid-state relays, which operate silently, but their diagnosis requires a multimeter.
Compressor malfunctions: when the motor cannot start
If the relay check does not gave results, attention should be switched to itself compressor. Clicking sounds may indicate that the engine is trying to start, but is being prevented by mechanical jamming of the piston group. In such cases, the motor hums, vibrates, the thermal protection clicks, and the unit goes silent.
Seizing often occurs due to the exhaustion of the life of the rubbing parts or lack of lubrication. The oil may have thickened or leaked, creating conditions for dry friction. Also, the cause may be an interturn short circuit in the windings, due to which the motor loses power and cannot overcome the initial resistance.
For diagnostics, professionals use the method of applying voltage directly, bypassing the automatic protective equipment, but doing this at home is risky. If, when you lightly tap on the compressor housing (with the refrigerator turned off), the sound changes or the possibility of a short start appears, this indicates mechanical jamming.
There is a table that helps classify sounds and their probable causes in the operation of the motor:
| Sound type | Probable cause | Difficulty of repair |
|---|---|---|
| Single click, silence | Malfunction of the starting relay | Low |
| Humming and clicking | Stuck compressor | High (replacement) |
| Crackling and clicking inside | Deformation of tubes or ice bursting | Medium |
| Rhythmic clicks | Thermostat or timer operation | Normal |
If the diagnosis of “compressor jamming” is confirmed, repair is usually impractical. Replacing the motor requires evacuation of the system, charging with freon and the presence of special equipment, which in cost is often close to the price of a new refrigerator.
Problems with the thermostat and temperature sensors
Another source of characteristic sounds may be thermostat (thermostat). This element is responsible for maintaining the specified temperature in the chambers. When the temperature inside rises above the set one, the bimetallic plate inside the thermostat bends and closes the contacts, which is accompanied by a loud click.
If the refrigerator clicks too often or, conversely, stops turning on for a long time, the sensor may be “stuck” or lost sensitivity. In models with electronic control, instead of a mechanical click, a quiet click of an electronic relay on the control board may be heard.
Checking a mechanical thermostat is simple: you need to remove the regulator and short-circuit the wires going to it. If, when connected to the network, the compressor starts working and there are no stops, then the problem is in the sensor. For electronic systems, it is necessary to check the resistance with a multimeter at different temperatures.
⚠️ Attention: When replacing the thermostat, it is important to correctly install the sensor capillary tube. It must fit tightly to the evaporator, otherwise the temperature readings will be incorrect and the refrigerator will work intermittently.
A faulty thermostat can lead not only to noise, but also to food spoilage due to insufficient or excessive cooling. Regular clicks may also indicate cyclic operation of the No Frost system, which is normal if the intervals comply with the instructions.
Hidden symptoms of a thermostat malfunction
If the refrigerator “cries” (ice freezes on the back wall) and clicks, the sensor may not give the command to turn off the compressor in time.
Influence voltage drops to start the engine
The quality of electricity in the household network directly affects the operation of electric motors. If there are voltage dropss observed in your home, the compressor may not start the first time, making clicking sounds. The starting relay is triggered, but the low voltage does not allow the rotor to reach the required speed.
In such situations, thermal protection turns off the motor to prevent the windings from burning out, and the cycle is repeated after a certain period of time. This phenomenon is especially typical for rural areas or old apartment buildings with worn-out communications.
To protect expensive equipment, it is recommended to use voltage stabilizers or phase control relays. These devices cut off power when the network parameters go beyond acceptable limits, preventing chaotic switching on and off of the refrigerator.
You can check the voltage in the network using a voltmeter. If the readings regularly fall below 190 Volts or exceed 240 Volts, the installation of protective equipment becomes mandatory.
Natural sounds: when clicks are the norm
Clicking sounds do not always indicate a breakdown. Modern refrigerators, especially those equipped with a No Frostsystem, make various sounds during normal operation. It is important to be able to distinguish alarm signals from the normal functioning of the unit.
One of the sources of sound is the expansion and contraction of plastic parts of the case and internal shelves when the temperature changes. When the compressor turns off, the temperature in the chamber begins to rise, and the plastic may make cracking or light clicking sounds.
Refrigerant moving through the tubes can also make sounds. After the compressor stops, the freon continues to circulate by inertia, which is sometimes accompanied by gurgling and clicking in the area of the evaporator. In systems with automatic defrosting, the timer may click when switching modes.
- 🔊 Plastic: Crackling when temperature changes (normal).
- 💧 Freon: Gurgling and flowing (normal).
- ⏱️ Timer: Clicking when switching to defrosting mode (normal).
- ❄️ Ice: Crackling when defrosting ice (normal).
If clicks are not accompanied by a lack of cold, freezing of the “fur coat” or an increase in temperature, most likely, your refrigerator is simply “talking” to you, informing you about work processes.
Algorithm for self-diagnosis and repair
If you decide to carry out diagnostics yourself, act strictly according to the instructions and follow safety precautions. The first step should always be to completely unplug the device. Only after this can you begin visual inspection and disassembly.
Get to the compressor by removing the back cover (if there is one). Inspect the starting relay: it should not have any signs of burning, melting or cracks. Try to carefully remove it and shake it: if you hear a rattling sound inside, it means that the mechanism is damaged and requires replacement.
⚠️ Attention: Carry out all work on the electrical part only when the power is turned off. Residual voltage in capacitors can be dangerous; let the equipment sit for 10-15 minutes after turning it off.
To replace the relay or thermostat, you will need a Phillips screwdriver and possibly pliers. New spare parts must have exactly the same markings as the old ones. Installation of components with other characteristics is unacceptable.
☑️ Checklist before calling a technician
If after replacing the relay the problem does not disappear and the compressor still clicks and does not start, most likely the motor itself is faulty. In this case, independent repair is not recommended, since work with the refrigeration circuit is required.
Prevention and operating rules
To minimize the risk of starting problems and reduce the amount of extraneous sounds, you should follow the operating rules. Do not install the refrigerator close to the wall, ensuring free circulation of air around the condenser.
Regularly defrost the device if it is not equipped with a No Frost system. Excessive ice causes the compressor to work longer and harder, which accelerates wear on parts. Also keep the condenser grille at the back clean.
Do not overload the refrigerator compartment with food, especially immediately after adding warm food. A sharp jump in temperature forces the motor to work at its limit, which can provoke clicking of the protection relay.
Following these simple recommendations will extend the life of your refrigerator and maintain silence in the kitchen. Remember that timely attention to the changed nature of the operation of equipment helps to avoid expensive repairs.
Frequently asked questions (FAQ)
Why does the refrigerator click but does not turn on?
Most likely, the start relay has failed or the compressor is jammed. The relay tries to start the motor, a click is heard, but due to a malfunction the start does not occur, and the thermal protection is triggered.
Is it normal if the refrigerator clicks when defrosting?
Yes, this is normal. When entering or exiting the defrost mode, the timer or switch is triggered, which is accompanied by a characteristic click. Plastic may also crack due to temperature changes.
Is it possible to use the refrigerator if it clicks?
If the clicks are rare and the cold persists, short-term operation is possible until the technician arrives. However, if the clicks are frequent, accompanied by a buzzing sound and lack of cold, it is better to turn off the equipment to avoid a fire.
How much does it cost to replace the start relay?
The cost of the relay itself is low, but the price may vary depending on the model of the refrigerator and the brand of the spare part. The main part of the cost is usually the work of a technician to diagnose and replace.
Why does a new refrigerator make clicking noises?
New equipment may make sounds due to the adaptation of materials (plastic expansion) or the operation of new, more sensitive sensors. If there is cold and the temperature is normal, there is no cause for concern.