The situation when after complete defrosting and restarting the refrigerator makes loud clicks, but does not start or works intermittently, is familiar to many owners of household appliances. This sound can be one-time, repeated at intervals of several minutes, or a constant crackling sound, reminiscent of a clock. You shouldn’t panic at such a moment, but you shouldn’t ignore the unit’s signals, since they can indicate both a harmless adaptation process and a serious breakdown.
Most often, clicks are associated with an attempt compressor to start, which encounters obstacles in the electrical circuit or mechanical problems. In other cases, the source of sound is thermal expansion of the housing materials or the activation of protective automation. Understanding the nature of the sound is the first step to solving the problem without calling a technician.
In this article we will analyze in detail the physics of the processes occurring inside the chamber and the engine compartment after switching on, and determine when noise is normal and when urgent repairs are required.
⚠️ Attention: If clicks are accompanied by a burning smell, sparking or smoke, immediately disconnect the device from the power supply and do not try to turn it on again until a specialist arrives.
Natural physical processes and thermal expansion
The most common and safest cause of clicks immediately after defrosting is thermal expansion materials. During defrosting, the refrigerator's internal components, such as the plastic box, metal shelves, and evaporator, are cooled to room temperature or even lower. When the compressor is turned on, a sharp temperature change begins.
Plastic and metal have different expansion coefficients. When cold air begins to circulate, the walls of the chamber contract or expand, producing characteristic sounds similar to clicks or crackles. This is especially true for models with a system No Frostwhere the temperature changes dynamically.
Usually such sounds do not last long - from 15 minutes to an hour, until the system reaches operating mode. If the clicks are rhythmic and quiet, and the refrigerator cools the food, then there is nothing to worry about.
Problems with the start-up relay and starting the compressor
If clicks are repeated at a certain frequency (for example, every 3-5 minutes) and are accompanied by an attempt to hum the motor, which immediately stops, the problem lies in the starting system. The main suspect here is start-protective relay.
This small element is responsible for supplying voltage to the motor windings at the time of start. After defrosting, moisture could remain in the engine compartment, which could cause oxidation of the contacts or a short circuit. The relay tries to start the motor, a click is heard, but due to a high starting current or lack of contact, the circuit opens.
The second reason is the failure of the relay itself. The bimetallic strip inside it could become deformed or stuck. In this case, the relay will constantly click, trying to turn on the compressor, but the engine will not start.
How to check the relay yourself?
Carefully remove the rear cover of the engine compartment (after disconnecting the refrigerator from the power supply). Look for a black or white box on the side of the compressor. Take it off and shake it near your ear. If a ringing or knocking sound is heard inside, the relay is faulty and requires replacement.
The influence of residual moisture on electrical equipment
Incorrect or hasty defrosting often leads to water flowing into the technical openings. Moisture can get into the thermostat contacts, wiring, or into the compressor itself. Water is a conductor and can cause microscopic breakdownswhich are perceived as clicks.
It is especially dangerous if water gets on the terminal block. In this case, clicking sounds may be a sign of sparking. If you let the refrigerator dry naturally for 12-24 hours, the problem may go away on its own.
However, if moisture has gotten inside the sealed compressor casing, the situation is more complicated. Water may have mixed with the oil, which impairs lubrication and causes the valves to knock during startup. In this case, clicks will be accompanied by uneven operation of the unit.
☑️ Rules for safe defrosting
Failures in the operation of the thermostat and sensors
Modern refrigerators, especially two-chamber ones, are equipped with a complex temperature control system. After defrosting, the sensors may give incorrect readings if they did not have time to warm up or were damaged mechanically (for example, due to careless washing).
Thermoregulator is a device that closes and opens the compressor power circuit depending on the temperature in the chamber. If its contacts are burnt or the mechanism is jammed, it will constantly click, turning the motor on and off randomly.
In models with electronic control, the cause may be failures in the control module. A voltage surge when turned on after being idle could lead to an error in the operating logic of the controller, which now incorrectly controls the relay.
Comparative table of symptoms and causes
To make it easier to diagnose the problem, we suggest that you familiarize yourself with the table that systematizes the main symptoms of malfunctions after defrosting.
| Sound type | Periodicity | Associated symptoms | Probable cause |
|---|---|---|---|
| Single loud click | Once every 10-20 minutes | The refrigerator is working normally | Thermal expansion or thermostat operation |
| Frequent crackling noise (like an automatic machine) | Continuously or in series | The motor hums, but does not start | Faulty start relay |
| Quiet clicks inside the camera | Immediately after turning on | Lack of cooling in the first minutes | Expansion of plastic/metal |
| Clicks with buzzing | Cyclic (5 min work / 5 min rest) | Compressor hot, cold no | Compressor jamming or freon leak |
Analysis of the behavior of your device in comparison with the data in the table will help narrow down the troubleshooting area. Remember that an accurate diagnosis can only be made by a specialist using diagnostic equipment.
When clicks indicate a serious breakdown
There are a number of symptoms that indicate that the matter will not be limited to simply drying or replacing the relay. If, after defrosting, compressor starts to work with strong vibration and metallic clanging, this may indicate destruction of the internal engine mount.
Another alarming signal is clicking sounds accompanied by a lack of cold for a long time (more than 2-3 hours). This may indicate refrigerant leak or blockage of the capillary system. In this case, the relay clicks, trying to start the motor, but the pressure in the system does not allow it to work correctly.
You should also be wary if clicks appear only at a certain position of the refrigerator. This may indicate that after defrosting and washing the unit was installed unevenly, and the compressor touches the tubes or housing during operation.
Algorithm of actions when clicks appear
If you hear suspicious sounds after turning on the refrigerator, act consistently. First, make sure that the device is level and there is nothing to interfere with vibration. Check whether the doors are tightly closed and whether there are any foreign objects inside the chambers that could have moved.
Next, listen to the nature of the sound. If these are rare clicks of the thermostat, calm down and observe. If there is a series of clicks and the motor does not start, unplug the device. Let it stand turned off for at least 2-3 hours so that the compressor cools down and any possible moisture dries out.
After a pause, try turning it on again. If the situation repeats, the start relay will probably need to be replaced or more in-depth diagnostics will be required. Do not try to disassemble the compressor yourself - this requires special tools and skills.
⚠️ Attention: Do not leave a refrigerator with a faulty relay plugged in for a long time. Constant attempts to start can burn the motor windings, and then repairs will cost the purchase of a new compressor.
Prevention of problems after defrosting
To avoid clicks and other problems, it is important to carry out the defrosting procedure correctly. Never use sharp objects to chip ice - this can damage the evaporator, which will lead to freon leakage and characteristic sounds during operation.
After washing the internal chambers, thoroughly wipe all surfaces, including rubber seals and technical openings. Make sure that moisture does not get into the area where the light bulb or thermostat is located.
Regularly check the condition of the door seals. If they do not fit tightly, warm air enters the chamber, more condensation and ice are formed, which increases the load on the system with each defrosting cycle.
The myth about “warming up” the compressor
There is an opinion that after turning on you need to let the refrigerator run empty for 2 hours. This is only partly true: the main thing is to allow the refrigerant to stabilize after transportation, and not after defrosting.
Is it normal for the refrigerator to click immediately after turning it on?
Yes, if it is 1-3 clicks in the first 10-15 minutes of operation. This is due to the start of refrigerant circulation and thermal expansion of materials. If the clicking continues for more than an hour or interferes with sleep, this is a reason to check.
Can a working No Frost refrigerator click?
Yes, No Frost systems make more sounds than drip models. Clicking noises may come from duct dampers, the fan, or the defrost mechanism. The main thing is that this is not accompanied by loss of cold.
What to do if after the click the refrigerator stops freezing?
You need to unplug the device for 12-24 hours to completely defrost (even if there is no visible ice). If after restarting the cold does not appear, you need to call a technician to look for a leak or check the compressor.
How much does it cost to replace the start relay?
The cost of the part itself is usually low (from 500 to 1500 rubles depending on the model), but the work of a technician to replace and diagnose can cost more. Self-replacement is possible if you have electrical skills.