The situation when the refrigerator clicks, but does not turn onis one of the most common and frightening for the owner of household appliances. You open the door, expecting the familiar hum of the engine, but instead you hear only a single or rhythmic click, followed by silence. It is already getting warm inside the chamber, food is starting to deteriorate, and the indicators on the panel may flash or light up red, signaling an emergency.
This sound, as a rule, comes from the rear lower part of the unit, where the compressor is located. It indicates an attempt starting the enginewhich for some reason is interrupted. It is important to understand that ignoring this problem can lead to serious consequences, including complete failure of an expensive compressor. In most cases, the reason lies in the electrical circuit or mechanical jamming of the components.
In this article we will look in detail at why refrigerator it makes such sounds, how to carry out initial diagnostics on your own and in what cases it is necessary to call a technician. We will look at the design of the starting mechanism, possible malfunctions of the thermostat and the operating features of modern inverter systems, which differ from classic models.
The principle of operation of the starting relay and compressor
To understand the nature of the sound, you need to look “under the hood” of the refrigeration unit. The heart of the system is compressor a sealed motor-pump that circulates refrigerant through the tubes. To start this electric motor, a special device is used - a starting protection relay. It is responsible for supplying a pulse to the starting winding and subsequent switching to the working one.
The clicking sound is the physical opening or closing of the contacts inside this relay. In good condition, the process looks like this: current is supplied, the relay clicks, starting the engine, the compressor begins to hum, and the relay clicks again, going into operation support mode. If you hear a click, followed by a pause, and then a second click, this means that the start cycle is interrupted. The motor tries to start, encounters resistance or lack of signal, and the protection forcibly opens the circuit.
The frequency of these clicks may vary. In some models Indesit or Atlant the interval can be several seconds, while in older units the pause can last up to a minute. This time is necessary for the bimetallic plate inside the protective mechanism to cool down to prevent overheating of the motor windings.
⚠️ Attention: If you hear frequent clicks (every 3-5 seconds), immediately unplug the refrigerator. Continuing to operate in this mode (“start mode”) burns out the compressor windings in a matter of hours.
It is important to note that the design of the relay may vary. Older models use electromagnetic devices, while newer ones use posistor devices. A posistor relay after an unsuccessful start requires time (up to 5-10 minutes) for the crystal to cool before passing current again. That is why repeated attempts to turn on may not occur immediately.
Faults start protection relay
The most likely reason that the refrigerator clicks and does not freezelies in a faulty start relay. This device is subject to constant thermal and electrical stress, which leads to its degradation over time. Inside the relay body there is a coil, contacts and, in the case of posistor models, the sensitive element itself.
If the contacts are burnt or oxidized, they cannot provide a reliable connection. When voltage is applied, sparking occurs (audible as a click), but current either does not pass to the motor windings or passes with high resistance. The compressor does not receive enough impulse to start and stops. Visually, traces of soot, melted plastic, or a characteristic burning smell may be visible on the relay.
It is also worth considering that the relay often fails due to power surges in the network. If the lights in your home flicker frequently, this could be the catalyst for a breakdown. Replacing a relay is one of the simplest procedures in refrigerator repairthat you can do yourself if you have basic skills.
- 🔌 Signs of breakdown: a distinct click, no motor hum, possible smell of plastic.
- 🛠️ Diagnostics: visual inspection for burning, contact testing with a multimeter.
- 💰 Cost: a new relay is inexpensive and is a consumable item.
In some cases, the problem may not be in the relay itself, but in its seat on the compressor. The contacts on the motor terminals can oxidize, resulting in poor contact even with a good new relay. Before replacing, it is recommended to clean the contact pads.
How to test a relay without a multimeter?
The easiest way is to gently shake the relay near your ear. If something dangles and rattles inside, it means that the mechanical part is destroyed and the device definitely requires replacement. However, the absence of sound does not guarantee serviceability.
Problems with the compressor: wedge or interturn short circuit
If replacing the relay did not help the refrigerator continues to click, the situation becomes more serious. In this case, there is a high probability of a malfunction of the compressor itself. The motor may be electrically correct, but mechanically seized. The piston group could wear out, the oil could thicken or lose its properties, which led to the inability to turn the shaft.
With a mechanical wedge, the compressor emits a characteristic dull hum or knock at the moment of the click, trying to move, but then the protection turns off the power again. Attempts to start such a motor “bypassing the protection” or using capacitors (a method popular among “Kulibins”) often lead to the final combustion of the windings. Modern compressors very sensitive to such experiments.
Another option is an interturn short circuit in the motor windings. In this case, the resistance of the windings drops, the current consumption increases sharply, and the thermal relay instantly breaks the circuit, making a click. This can be diagnosed by measuring the resistance of the windings with a multimeter. If it differs from the nominal value (usually indicated on the case) or shows zero/infinity, the compressor is faulty.
It is worth noting that replacing a compressor is a complex and expensive procedure that requires special equipment for evacuating the system and charging freon. In most cases, it is more economically feasible to purchase a new refrigerator, especially if the model is older than 7-10 years.
Malfunctions of the thermostat and control module
Sometimes the reason that the refrigerator clickslies not in the power part, but in the control system. A thermostat (temperature regulator) is a device that gives the command to turn on the compressor when the temperature in the chamber rises. If the thermostat contacts are stuck or oxidized, it may not give a signal to start, or, conversely, it may give it randomly.
In modern models with electronic control, the role of a thermostat is performed by a control module (board). In this case, clicks can be produced by electromagnetic relays on the board itself. If one of the relay contacts on the board burns out, the compressor will not receive power. Diagnostics of the board requires special knowledge and equipment, since it is necessary to check the output voltage at the compressor terminals at the moment of the “click.”
It is also worth checking the temperature sensor. If it transmits incorrect data that there is already “polar night” in the chamber, the control module simply will not give the command to start, despite your attempts to turn on the refrigerator.
It is important to distinguish between the clicks of the compressor relay and the clicks of the thermostat. The thermostat click usually occurs less frequently and is not accompanied by an attempt to start the engine in the same millisecond. If a click is heard at the top of the refrigerator (where the regulator is usually located) and the motor is silent, the problem is in the thermostat.
Diagnostics and table of symptoms
To more accurately determine the malfunction, it is recommended to conduct a comprehensive diagnosis. Below is a table to help match symptoms with possible causes. Remember that an accurate diagnosis can only be made by a specialist using a professional tool.
| Symptom | Probable cause | Necessary actions |
|---|---|---|
| Single click, silence, light on | Faulty starting relay | Replace relay, check contacts |
| Frequent clicks (every 3-5 sec) | Compressor wedge or short circuit windings | Disconnect urgently, call a technician |
| Click, hum 2-3 seconds, click | Voltage drop or motor wear | Check the network, replace the compressor |
| Clicks at the top, the motor is silent | The thermostat is faulty | Replacing the thermostat |
| There are clicks, but there is no start, there is a burning smell | Wiring or relay burnt out | Visual inspection, wiring repair |
When performing diagnostics, be sure to use personal protective equipment and follow safety precautions. Working with live electricity is life-threatening. Before any manipulations inside the case de-energize the appliance.
If you are not confident in your abilities, it is better not to take risks. Incorrect assembly or connection error may result in short circuit and fire. In such cases, it is more rational to contact the service center.
Algorithm of actions when a problem is detected
If you encounter the problem described, do not panic. Act consistently to minimize damage and correctly assess the situation. The first step is always a visual inspection and turning off the power.
Next, you should check the voltage at the outlet. Sometimes the cause of the “clicking” sound is simply a bad connection in the socket or low voltage in the network, which does not allow the compressor to start. Try connecting the refrigerator to another outlet, preferably through a surge protector or stabilizer.
☑️ Primary diagnostics
After this, you can begin to inspect the rear panel. Remove the casing (if equipped) and get to the compressor. Carefully, without jerking sharply, remove the start relay. Inspect it for external damage. If visually everything is in order, you can try to replace it with a known good one (for example, taken from friends with a similar model or purchased in a store).
⚠️ Attention: When removing the relay, be careful with the tubes and wires. They may be fragile. Do not use excessive force.
If replacing the relay did not help, and the compressor still does not start or makes strange sounds, further independent repair is not recommended. Professional diagnostics of the motor and electrical circuit are required.
Prevention and operating recommendations
To avoid situations where the refrigerator clicks and does not workit is necessary to follow the operating rules. Regularly clean the condenser (grid at the back) of dust and animal hair. A dirty condenser leads to overheating of the compressor and tripping of the protection.
Make sure that the voltage in your electrical network is stable. Installing a voltage stabilizer is an excellent solution for protecting expensive household appliances from surges, which are the main cause of failure of starting relays and motor windings.
Do not overload the refrigerator with food and do not place it close to the wall. For normal operation, the compressor requires a free flow of air. Impaired heat transfer causes the motor to work with overload, which reduces its service life.
It is also worth periodically checking the door seals. If they do not fit tightly, warm air enters the chamber, causing the compressor to turn on more often and work longer. This also leads to premature wear of the starting equipment.
Frequently asked questions (FAQ)
Why does the refrigerator click but does not turn on immediately after defrosting?
This may be due to the fact that there is a lot of moisture left in the system, or the compressor has not yet cooled down. It is also possible that the thermostat has not yet reached the desired temperature to turn on. Let the refrigerator stand off for 2-3 hours, then turn it on. If the clicking continues, the problem is in the relay or motor.
Is it possible to operate the refrigerator if it clicks but freezes?
It is highly not recommended. Clicking sounds indicate that the starting current is too high or the starting mechanism is not working correctly. This is a “ticking time bomb”: at any moment the compressor can burn out completely. It is better to fix the malfunction promptly.
How much does it cost to replace the start relay?
The cost of the relay itself varies from 500 to 2000 rubles, depending on the model of the refrigerator and the manufacturer of the spare part. The work of a replacement specialist usually costs from 1000 to 2500 rubles. This is one of the cheapest types of repairs.
Does the length of the power cord affect the start of the compressor?
Yes, if you used an extension cord. An extension cord that is too long or too thin creates resistance, causing the voltage entering the refrigerator to drop. The compressor doesn't have enough power to start and it clicks. Plug the equipment directly into the outlet.