Sharp sounds coming from operating household appliances are always cause caution, especially if it is a refrigerator that operates around the clock. If you hear that the refrigerator clicksbut continues to freeze normally, it’s too early to panic. In many cases, this is normal operation of the electrical circuit or thermostat, and not a sign of an imminent breakdown.
However, you cannot ignore extraneous noise either. Intermittent clicking sounds may indicate an overloaded engine, a faulty start relay, or problems with the thermostat. In this article, we will analyze in detail the physics of the process, learn to distinguish normality from pathology, and determine when it is necessary to call a specialist, and when simple prevention is enough.
It is important to understand that the nature of the sound and the frequency of its occurrence play a decisive role. Short single clicks once an hour and frequent chattering when trying to start are two completely different scenarios that require different approaches to diagnosis and repair.
Physiology of the compressor and thermostat
The main source of noise in the refrigerator is the compressor - the “heart” of the cooling system. During its operation, as well as when it stops, physical processes occur in the system, which may be accompanied by characteristic sounds. Often clicks occur when the unit is turned on or off, when the pressure in the circuit changes and the automation is activated.
Thermostat (thermostat) is a mechanical or electronic device that monitors the temperature in the chamber. When the temperature rises above a preset threshold, the contacts close, supplying current to the motor. This switching moment is often accompanied by a loud click. A similar sound, but sometimes more dull, is heard when the contacts open when the desired temperature is reached.
If the refrigerator makes single click before starting work or immediately after it ends, this is absolutely normal. This is how an electromechanical relay works. However, if the clicks are repeated in series, and the engine does not start, or hums for only a few seconds and goes silent, this is already an alarming signal.
Normal sounds: when clicking is correct
Modern models of refrigerators, be they Indesit, Atlant or premium LG, can make various sounds during normal operation. It is important to learn to differentiate them so as not to waste money on unnecessary repairs.
The first type of normal sound is the operation of the thermostat. As mentioned, the moment the system decides to start the cooling cycle, there is a distinct click. The second type is the sound of plastic and metal expanding or contracting. When the temperature changes, the internal walls and shelves may deform slightly, producing a crackling sound, which users often confuse with electrical clicks.
The third case is the operation of the No Frost system. In such models, the fan and defrost heating element are turned on periodically. Switching modes may also be accompanied by relay switching sounds. If at the same time temperature in the chambers it is stable and the food does not spoil, most likely the equipment is working properly.
Pathological sounds: signs of malfunction
The situation changes dramatically when clicks become frequent, rhythmic and accompanied by the absence of cold. This is a classic picture of the compressor trying to start but not being able to. The electronics or starting relay sends an impulse, the motor hums or clicks, but the shaft does not rotate.
The most common reason is failure of the starting relay. This is a small part that supplies increased current to the motor winding for starting. If the relay is stuck or burned out, it will click endlessly, trying to start the engine, or simply crackle. In such cases, the compressor can heat up, which is dangerous for its windings.
Another serious reason is an interturn short circuit in the compressor itself or its mechanical wedge (piston group scuffing). In this case, clicks may be a sign of a thermal relay tripping, which emergency turns off the power to prevent a fire. If the refrigerator clicks and does not turn on for more than 30 minutes, immediately disconnect it from the network.
⚠️ Attention: Prolonged operation of the engine in the “clicking” mode (attempts to start) leads to overheating windings and can permanently damage the compressor. Do not leave a faulty device turned on unattended.
Diagnostics: step-by-step instructions
Before calling a technician, you can carry out an initial diagnosis. This will help you more accurately describe the problem to a specialist or, perhaps, resolve the issue yourself if the issue is minor.
Listen first: does the refrigerator click constantly during operation or only at the moment of startup? If the sound occurs every 3-5 minutes and there is no cold, the problem is almost certainly in the starter or compressor. If the clicks are rare and chaotic, check whether the refrigerator body is touching the walls or furniture - vibration can be transmitted to foreign objects.
Next is a visual inspection. Unplug the unit, move it away and remove the back panel (if access is available). Inspect the wires for melting. If you have skills in working with a multimeter, you can “ring” the thermostat and the start relay for an open or short circuit.
☑️ Primary diagnostics of the refrigerator
Table: Explanation sound signals
For the convenience of systematizing problems, we have compiled a table that will help you quickly navigate the nature of the malfunction based on the sound.
| Sound type | Frequency | Cold state | Probable cause |
|---|---|---|---|
| Single loud click | Once every 30-60 minutes | Normal | Thermostat operation (Normal) |
| Series frequent clicks | Every 2-5 minutes | No cold | Faulty start relay |
| Humming + clicking + silence | Cyclic | Weak or not | Compressor wedge or voltage drop |
| Crackling inside the chamber | Chaotic | Normal | Thermal expansion of plastic/ice |
DIY Repair: replacing the start relay
If the diagnostics indicated the start relay, replacing it is one of the most affordable procedures for a home craftsman. This part is inexpensive and is often sold in appliance parts stores. The main thing is to choose an analogue that is identical to yours.
First, make sure that the refrigerator is disconnected from the power supply. Remove the housing from the compressor (usually it is held on by latches or screws). You will see a black box placed on the compressor rod with three contacts. Carefully remove it, having first photographed the position of the wires.
The new relay is installed in the same position as the old one (usually the “UP” arrow should face up). After installation, assemble the structure and turn on the refrigerator. If the motor starts the first time and runs smoothly, the repair was a success.
Is it possible to temporarily short-circuit the relay?
Theoretically, you can start the motor without a relay by applying current directly, but this is extremely dangerous and can lead to burnout of the windings or a fire. Do this only for a short-term check of the compressor.
Prevention and proper care
To extend the life of the compressor and avoid situations where The refrigerator clicks it does not freeze, it is important to follow the operating rules. First of all, this is a stable voltage in the network. Electricity surges are detrimental to electronics and motor windings.
Regularly clean the condenser (grid at the back) of dust and animal hair. A clogged heat exchanger causes the compressor to work overload, trying to remove heat, which leads to overheating and frequent activation of protective relays. Also make sure that the refrigerator is level - a misalignment can disrupt the operation of the compressor oil system.
Do not load warm foods into the chamber. A sharp increase in temperature causes the thermostat to work in extreme mode, increasing the on/off cycles, which increases wear on the starting equipment.
Why a refrigerator does it click, but does not start after defrosting?
A common reason is that water has gotten into the electrical part or onto the thermostat contacts. The defrost sensor could also be faulty. Allow the refrigerator to dry completely for 24 hours before turning it on again.
Is it dangerous if a new refrigerator clicks?
In new models with inverter compressors there should be no clicks, they work smoothly. In conventional compressors, single clicks at start-up are acceptable. If the new unit is constantly cracking, this is a defect that requires replacement under warranty.
Can a magnetic door latch click?
Yes, sometimes users confuse the clicks of the compressor with the sound of a magnetic seal that “sticks” to the body when the door is closed. This is absolutely normal and indicates good tightness.
What to do if the plugs come out after a click?
This is a sign of a short circuit in the compressor or heating element circuit. You cannot turn on the machine again - you need to call an electrician or a refrigerator repairman to look for an insulation breakdown.