The situation when the refrigerator has stopped working and makes characteristic clicks often takes you by surprise. You open the door, and it’s already warm, the food begins to spoil, and the unit, instead of the usual hum, makes short, abrupt sounds. This is a signal that the launch system the compressor is trying to work, but is encountering an obstacle. Most often, this indicates a mechanical or electrical engine blockage, which the security system tries to overcome, but to no avail.
There is no need to panic at such a moment, although the situation requires a quick response. Clicks can come from different components: from start relay, the motor itself, or even the thermostat. Understanding the nature of sound will help determine whether you can handle the problem yourself or whether you will need to call a specialist with sophisticated equipment. It is important to distinguish the normal operation of the thermostat from the emergency mode.
In this article we will analyze in detail all the possible reasons why The refrigerator clicks and does not turn on. We will look at the design of the starting device, methods for diagnosing windings and the operating features of modern inverter systems. Knowing these nuances will help you make the right decision about further actions and, possibly, save your budget on repairs.
The principle of operation of the start relay and compressor
To understand the source of the problem, you need to understand the mechanics of the start. The heart of the refrigerator is compressorwhich compresses the refrigerant and drives it through the system. However, the compressor electric motor cannot start on its own - it needs an initial push and the creation of torque. This function is performed starting relaywhich supplies a pulse to the starting winding.
At the moment the power is turned on, the relay contacts close, supplying voltage to the engine. If the start is successful, the centrifugal mechanism or thermal relay opens the circuit of the starting winding, and the motor runs on the main one. The click that you hear is precisely the moment when these contacts are trying to close or open. If the process is disrupted, a second click is heard after a certain time.
The cycle can be repeated every few minutes. This is a work thermal protection relaythat turns off the power when it overheats or fails to start, to prevent the windings from burning out. Thus, a clicking sound is a symptom that the system is trying to start, but is physically unable to turn the motor shaft or create the necessary pressure.
Why does the relay click?
The relay clicks due to the bimetallic strip returning to its original position after cooling or attempting to restart contacts. This is the mechanical sound of metal hitting metal inside a compact case.
Main causes of clicks and startup failure
There are several key factors leading to the described malfunction. Most often the problem lies in the electrical part or mechanical jamming. Let's consider the most likely scenarios that equipment owners face.
The first and most common reason is failure starting relay. Inside this small device is a coil and a movable core. Over time, contacts burn out and mechanical parts wear out. The relay simply cannot keep the circuit closed long enough to start the motor, and a dry shut-off click is heard.
The second reason is problems with the compressoritself. If the engine hums but does not start, and then there is a clicking sound and the hum stops, the piston group may be stuck. One of the turns of the winding could also burn out, which leads to a short circuit and instantaneous operation of the protection. In this case starting the engine is physically impossible without replacing the unit.
- 🔌 Power surges: Sudden changes in the network could damage the electronics or motor windings, which led to unstable operation.
- 🧊 Thermostat malfunction: The temperature sensor could be “stuck” in the “on” position, constantly sending a signal to start, although there is no cold in the chamber.
- 🔥 Overheating: If the condenser (grid at the back) is clogged with dust or is pushed close to the wall, the compressor overheats and goes into protection.
⚠️ Attention: If you hear a loud metallic clang or knock when you try to start, immediately unplug the device. Continued use can lead to complete destruction of the compressor and depressurization of the system.
Diagnostics of the starting relay with your own hands
If you have minimal skills in working with tools, you can try to diagnose starting relay. This is the most common candidate for replacement and the least expensive repair option. First, you need to turn off the power to the refrigerator and gain access to the compressor by removing the rear plastic cover at the bottom of the unit.
Carefully remove the relay from the contacts of the compressor. Usually it is fixed with a bracket or simply sits tightly on the terminals. Inspect the body of the device: there should be no cracks, traces of burning or melting. If the relay smells like burnt plastic, replacing it is necessary in any case. Also shake the device near your ear: if a clear knocking sound of broken parts is heard inside, the relay is faulty.
For a more accurate check, you will need a multimeter. Switch the device to resistance measurement mode (Ohms). Ring the relay contacts according to the diagram on the housing or in the instructions. The resistance between certain contacts should be close to zero (short) or infinity (open), depending on the type of relay and the state of the contacts. A discrepancy in the readings indicates a breakdown.
☑️ Checking the relay
It is worth considering that relays come in different types: electromagnetic and posistor. Posistor models are found more often in modern technology. They do not have moving mechanical parts in the traditional sense, but they can also fail. Replacement is usually not difficult if an analogue with identical characteristics is selected.
Problems with compressor windings
If checking the relay does not produce results, attention turns to the engine itself. There are three terminals inside the compressor: two for the working windings and one for the starting winding. When testing with a multimeter, the resistance between the terminals should be within certain limits. Usually the resistance of the starting winding is higher than that of the working winding.
If the multimeter shows infinity (break) on any of the windings, it means the wire is burned out. It is impossible to restore such a winding at home. If the resistance is close to zero, this indicates an interturn short circuit. In both cases, compressor requires replacement, since it will not be able to create the necessary pressure in the system.
It is also worth checking the breakdown on the housing. One multimeter probe is applied to any contact, and the second is applied to a copper tube or unpainted part of the case. The device should show infinity. If there is at least some resistance, it means that the insulation is broken, and the operation of such a refrigerator is dangerous to life.
| Type of fault | Multimeter readings | Probability of repair | Actions |
|---|---|---|---|
| Winding break | Infinity (1) | 0% | Replacing the compressor |
| Short circuit | Close to 0 Ohm | 0% | Replacement of the compressor |
| Breakage to the housing | Any value | 0% | Urgent replacement |
| Normal | 10-50 Ohm (working), 20-100 Ohm (starting) | High | Checking the relay |
Mechanical wedge and starting with a hammer
Sometimes The electrical part is working properly, but the compressor cannot turn over due to mechanical jamming of the piston group. This happens when the equipment is idle for a long time or its resource is exhausted. The oil thickens, the parts are deformed, and the shaft stands up tightly. In this case, the relay clicks in an attempt to start the motor, but the shaft remains stationary.
There is a method known as "hammer starting". It involves turning on the refrigerator and at the same time lightly hitting the compressor housing near the bottom with a hard object (hammer handle). Vibration can help move stuck parts out of place. If after the impact the compressor hums and starts up, you are in luck, but this is a temporary measure.
However, this method does not always work and carries risks. If there are already metal shavings or serious damage inside, the impact can completely finish off the unit. In addition, if the compressor starts after an impact, it can work from a few hours to several months, after which it will require a full replacement.
Features of inverter refrigerators
Owners of modern models with the inscription Inverter on the body may encounter other symptoms. These refrigerators do not have a classic start relay or abrupt starts. The compressor operates smoothly, varying its speed. If such a refrigerator clicks and does not freeze, the problem is most likely in the electronic control module or the inverter motor itself.
Clicks in inverter models are often produced by the control board, trying to send an impulse to start, but receiving an error from the sensors or the motor itself. Self-diagnosis is difficult here, since special equipment is required to read error codes. Without this, you can only state the fact of a malfunction.
It is also worth checking the wiring. Vibration during operation could loosen the contacts in the connectors. Oxidation or poor contact can lead to the fact that inverter unit goes into protection and produces sound signals or relay clicks on the board.
⚠️ Attention: Repairing inverter refrigerators requires high qualifications. An attempt to replace the compressor with a regular one (not an inverter one) without re-soldering the entire control system will lead to failure of the equipment.
When a call to the technician is necessary
Despite the possibility of self-diagnosis, there are situations when you cannot do without a specialist. If you have checked the relay and made sure that the windings are intact, but the refrigerator still does not start, the problem may be hidden defects or a freon leak. Although the leak usually does not cause clicks, the lack of pressure in the system can load the engine if the sensors do not turn it off in time.
A technician is also needed to replace the compressor. This process requires:
- 🛠️ Special tools: Burners, pipe cutters, rolling.
- 🌬️ Evacuation: The system must be cleared of air and moisture before refueling.
- 🧪 Refrigerant refills: The exact amount and type of freon is required, as well as scales for dosing.
An attempt to carry out this work yourself without experience often leads to the new compressor burning out after a few days due to moisture in the system or improper charging. Therefore, if the diagnosis confirms the death of the motor or a leak, it is better to entrust the repair to professionals.
How much does the repair cost?
The cost consists of the price of a new compressor, the work of a technician and consumables. On average, replacing a compressor costs 40-60% of the cost of a new refrigerator.
Prevention of repeated breakdowns
To extend the life of the refrigerator after repair or to avoid problems in the future, follow simple rules. Ensure good ventilation of the back wall, leaving a gap of at least 5-10 cm from the wall. Defrost the chamber regularly (if the system is not No Frost) to avoid unnecessary load on the unit.
Use a voltage stabilizer if there are surges in your network. This will protect not only the compressor, but also the control electronics. And remember: timely contacting specialists at the first signs of a malfunction (strange sounds, long hours of operation) can save the equipment from expensive repairs.
Following these recommendations will allow your refrigerator to work reliably and for a long time, keeping food fresh and your nerves in order. Remember that regular maintenance is cheaper than emergency repairs or buying new equipment.
Frequently asked questions (FAQ)
Is it possible to operate a refrigerator if it clicks but sometimes turns on?
It is highly not recommended. Even if it starts periodically, operation in emergency mode (with frequent activation of protection) will quickly destroy the compressor completely. It is better to turn off the device and carry out diagnostics.
How much does a new start relay cost?
The cost of a relay is usually low and varies depending on the model of the refrigerator, on average from 500 to 2000 rubles. However, the price may be higher for rare or inverter models.
Why does the refrigerator click immediately after defrosting?
Perhaps water got on the electrical contacts of the relay or wiring, causing a short circuit. Ice may also have formed in the compressor area, preventing starting. Allow the equipment to dry completely (24 hours) before turning it on.
Are humming and clicking sounds the same thing?
No. The hum is the sound of an electric motor running. Clicking is the mechanical sound of a relay or protection. If there is a hum, but no shut-off click, the motor is running but not pumping (clint). If there is a click and silence, the engine does not start.
Is it possible to replace the compressor with a different brand?
Theoretically, it is possible if the dimensions, power, type of refrigerant and volume are the same. However, for the system to operate correctly, it is often necessary to reconfigure the thermostat or electronics, which only a specialist can do.