The situation when the refrigerator clicksbut does not start or makes periodic sounds during operation, is familiar to many owners of household appliances. This specific knock is often the first signal that there is a problem in the cooling system that requires immediate attention. Ignoring the problem can lead to failure of an expensive compressor or spoilage of food due to defrosting.
In most cases, clicks indicate an attempt by the engine to start, but due to the lack of the necessary voltage or a mechanical obstacle, the start does not occur. Modern models with inverter compressors they can behave differently than older units, but the physics of the process remains similar. Understanding the nature of the sound helps determine whether you can solve the problem yourself or whether you will need to call a repairman.
It is important to distinguish between normal operating sounds, such as refrigerant flow or occasional thermostat clicks, and alarm signals. If the clicks are accompanied by a hum that ends abruptly, or if the unit has stopped freezing, it is necessary to carry out an initial diagnosis. Below we will analyze in detail the main causes of extraneous sounds.
Normal operation of the thermostat and sensors
Do not panic ahead of time, since in some cases clicks in the refrigerator they are an absolutely normal phenomenon. The main source of sound in a working device is a thermostat or an electronic temperature sensor. When the set temperature is reached inside the chamber, the contacts open, turning off the compressor, which is accompanied by a characteristic sound.
A similar process occurs when turned on again: the system detects the increase in temperature and gives a command to start the motor. In older models, this sound is louder and more sonorous, while modern systems operate quieter. If a click occurs once every 20-40 minutes and is accompanied by the beginning or end of the cooling cycle, the equipment is functioning correctly.
However, if the frequency of clicks increases and they begin to repeat every few minutes without fully starting the motor, this indicates a failure in the control system. Perhaps the thermostat is “stuck” or incorrectly reading the temperature, constantly trying to start or stop the compressor.
⚠️ Attention: If the thermostat clicks begin to occur too often (every 2-3 minutes), this may indicate a depressurization of the system or a freon leak. The compressor cannot reach the desired temperature and constantly turns on and off cyclically.
To check normal operation, you can listen to the nature of the sound. A soft, dull click is usually produced by a relay, and a loud click is usually produced by a mechanical thermostat. It is important not to confuse these sounds with system alarms.
Failure of the compressor starting relay
One of the most common reasons why the refrigerator clicks and does not turn onis the failure of the starting relay. This small but important element is responsible for supplying the impulse to the motor winding necessary to start it. When the relay is triggered, a click is heard, but if the mechanism is worn out or burnt out, the engine does not receive the desired push.
Visually, the malfunction can manifest itself as follows: you hear a click, the motor begins to hum for a few seconds, then a second click follows (shutdown by protection), and there is silence. After some time, the cycle repeats. Inside the relay there is a coil and contacts that burn or stick over time, especially during power surges.
- 🔨 Mechanical wear: The moving contacts inside the relay lose their elasticity or become covered with soot, which prevents the normal closure of the circuit.
- 🔥 Overheating: Long-term operation in high conditions ambient temperature leads to deformation of the plastic case of the relay and disruption of contacts.
- ⚡ Power surges: Sudden changes in the electrical network can instantly disable the relay electronics, requiring its replacement.
Replacement of the starting relay is one step one of the simplest procedures in refrigerator repair. It does not require any special tools other than a screwdriver and takes about 15-20 minutes. The main thing is to choose a compatible relay model, since they differ in the type of fastening and current parameters.
How to test a relay without a multimeter?
Visually inspect the inside of the relay. If you can see blackness inside, a burning smell, or melted plastic, the part is definitely faulty. You can also gently shake the relay: if you hear the knocking sound of a detached core inside, it needs to be changed.
Problems with starting the compressor
If everything is in order with the relay, but the refrigerator clicks and is buzzing, the problem may lie in the very heart of the unit - the compressor. A motor may be mechanically sound, but have problems with the electrical part, for example, inter-turn short circuit of the windings. In this case, the starting current exceeds the permissible limits, and the thermal protection relay instantly breaks the circuit.
There is a concept of “compressor jamming”. This happens when the rubbing parts of the engine are welded due to overheating or lack of lubrication. The motor tries to jerk off, there is a loud click and hum, but it cannot turn the shaft. In such cases starting the compressor is possible only with the help of a special step-up transformer, and even then not always.
Diagnostics of the condition of the windings requires the use of a multimeter. It is necessary to measure the resistance between the contacts. If the device shows infinity (open) or zero (short circuit), the compressor must be replaced. Changing the motor yourself is difficult, since it requires evacuation of the system and charging with freon.
| Symptom | Possible cause | Necessary actions |
|---|---|---|
| One click and silence | Faulty starting relay | Replacing the relay |
| Humming for 5-10 seconds, then clicking | Compressor jammed | Attempt to wedge or replacement |
| Frequent clicks without buzzing | Thermostat is faulty | Diagnostics of the thermostat |
| Clicks and burning smell | Wiring or relay burnt out | Inspecting contacts and replacing burnt elements |
It is worth noting that if the compressor fails, it is often more economically feasible to purchase a new refrigerator, especially if the model is more than 7-10 years old. The cost of a new motor and installation work can be up to 50% of the price of a new device.
Faults in the electrical circuit and wiring
Sometimes the reason that the refrigerator makes clicking soundslies not in the main units, but in the batteries and wiring. Oxidation of contacts in a plug, socket or on the terminal block of the refrigerator itself leads to sparking. Each such micro-discharge is accompanied by a sound similar to a quiet crackling or click.
Particular attention should be paid to the surge protector or extension cord if the refrigerator is connected through them. Cheap filter models under high load can make sounds due to poor-quality switching inside. Starting current The compressor is several times higher than the rated one, which creates a load on the contacts.
Check the integrity of the power wire. If the insulation is damaged or the wire is pinched, a short circuit may occur, which is accompanied by a click and operation of the plugs or circuit breakers in the panel. In this case, operating the device is dangerous to life.
⚠️ Attention: Before any manipulations with the electrical part (plug, socket, internal wires), be sure to unplug the refrigerator! Working under voltage is strictly prohibited.
If you notice blackening on the plug or socket, they must be replaced. The use of Euro-standard adapters in old sockets often leads to poor contact and heating, which also causes cracking.
The influence of power surges on startup
Instability of the power grid is the scourge of many regions. If the network voltage drops below the permissible level (less than 190-200 Volts), the compressor is physically unable to develop the necessary power to start. It begins to hum and click, trying to start, but the protection turns it off again.
Constant operation in low voltage conditions is detrimental to the motor windings. They overheat, the insulation melts, which inevitably leads to a short circuit. Protective relay in this situation, it does its job, saving the motor from combustion, but the very fact of frequent attempts to start is already stressful for the equipment.
- 📉 Low voltage: The motor hums, but does not start, it clicks thermal protection.
- 📈 High voltage: Can lead to insulation breakdown and instant failure of the control electronics.
- ⚡ Pulse interference: Short-term surges can disrupt the settings of the electronic control module.
To protect expensive equipment in unstable network conditions, it is recommended to use a voltage stabilizer. This device equalizes the input parameters and provides compressor current of the required quality, extending the life of the refrigerator.
Specifics of operation of inverter compressors
Owners of modern models may encounter the fact that the refrigerator clicks different than old units. Inverter compressors do not turn off completely, but only reduce speed. However, a starting relay is also present in them, and its operation when initially turned on or after defrosting can be heard.
Unlike linear motors, inverters have a complex electronic control board. If this board fails, it may produce incorrect startup signals, accompanied by a series of clicking sounds. Diagnostics of such systems requires special equipment and knowledge.
Often users mistake the sound of the inverter itself for a breakdown. At low speeds, it may produce a high-pitched hum or crackling sound, which is normal. However, rhythmic loud clicks that interrupt operation are not the norm.
Diagnostics and procedure for detecting noise
If you hear that the refrigerator often clicks, do not rush to call a technician right away. Conduct an initial diagnosis that will help you narrow down your search or even solve the problem on your own. First of all, evaluate the nature of the sound and accompanying signs (is it heating, is it freezing, is there light).
Check whether the door fits tightly and whether the chamber is overloaded with food. Sometimes the extraneous sound does not come from the motor, but from the vibration of the dishes or housing elements that resonate with the operation of the motor. Knock on the case: if the sound has changed, it may be due to vibration.
If the problem is clearly technical, use the following algorithm of actions. It will help you safely identify the malfunction and prepare information for the technician if independent repair is impossible.
☑️ Diagnostic algorithm
Remember that independent intervention in the sealed system (tubes, compressor) without skills and equipment is prohibited. You can damage the pipeline or release all the freon, which will significantly increase the cost of repairs.
Frequently asked questions (FAQ)
Is it possible to operate a refrigerator if it clicks?
Short-term operation is possible if the refrigerator remains cold and the clicks are rare (once an hour). If the clicks are frequent, the motor hums and turns off, or the unit has stopped freezing, use is prohibited, as this can lead to a fire or complete failure of the compressor.
How much does it cost to replace the start relay?
The relay itself is inexpensive (usually from 500 to 1500 rubles depending on the model). However, if you do not have the skills, you will have to pay for the work of the master. In general, this is one of the cheapest types of repairs.
Why does the refrigerator click after defrosting?
After defrosting, the thermostat records the high temperature and gives the command to start. If at this moment there is a clicking sound and the motor does not start, there may be water left in the system that has got on the contacts, or the compressor is jammed after being idle.
Is cracking inside the freezer dangerous?
Crackling inside the chamber is often caused by the expansion or contraction of plastic walls and panels when the temperature changes. This is a physical process that does not require repair. If the crackling sound is accompanied by clicks from the motor, this is a sign of a malfunction.
How to extend the life of the compressor?
Do not place the refrigerator close to the wall (you need a gap for ventilation), defrost it regularly (if it is not No Frost), do not load hot food and keep the condenser at the back of the unit clean.