The situation when the refrigerator starts and immediately turns off often takes owners by surprise. You hear the characteristic hum of the motor, but literally after 3-5 seconds a click is heard and the unit goes silent. This is a classic symptom of a protective mechanism that is triggered due to overload or the inability to start the engine.
This behavior of the equipment cannot be ignored, since compressor it is under the threat of complete failure. If the motor constantly tries to start and stall, the windings may burn out within just a few hours of active “fight” with the protection system. In this material, we will analyze the main reasons why the refrigerator turns on and immediately turns off, and determine what you can do yourself.
Most often the problem lies in the electrical part or mechanical jamming. Start relay or thermal protection may be faulty, preventing the rotor from gaining the required speed. It is also worth considering the condition of the wiring and the voltage in the network, since modern inverter and linear models are extremely sensitive to surges.
Problems with the start relay and thermal protection
The most common reason that the refrigerator turns on and immediately turns off is a malfunction of the start protection relay This small unit is responsible for supplying voltage to the starting winding of the engine at the moment of start. If the contacts inside the relay are oxidized or burnt, the current simply does not reach the target, and the thermal protection is triggered.
Thermal protection is a bimetallic plate that opens the circuit when overheated. If the relay is stuck closed, current flows continuously, causing heat. As a result, after a few seconds of operation, a click is heard and the refrigerator turns off. After cooling, the cycle repeats. Replacing this part is a task that can be done with your own hands if you have basic skills.
When diagnosing, it is important to pay attention to the condition of the contacts. Carbon deposits or black spots indicate that the part requires replacement. Starting relay It is inexpensive, but its failure completely blocks the operation of the cooling system. It is also worth checking whether the relay is tightly seated on the compressor contacts - sometimes it simply jumps off due to vibration.
How to check the relay with a multimeter?
To check, remove the relay and shake it. If a ringing sound is heard (as from a rattling stone), it means that the mechanism is destroyed. Test the contacts with a multimeter: under normal conditions, the resistance should be close to zero. If the device shows a break or huge resistance, the part is faulty.
Some models of refrigerators, for example Indesit or Atlant, use a relay with a posistor. They have no moving parts, but are also susceptible to fading. If you are not confident in your abilities, it is better to call a specialist, since working with electricity requires caution.
Malfunction of the compressor and motor windings
If checking the relay does not produce results, the problem may lie in the very heart of the unit - the compressor. When the refrigerator starts and immediately stalls, this may indicate an interturn short circuit in the motor windings. In this case, the current increases sharply, and the thermal relay instantly breaks the circuit, preventing a fire.
You can diagnose an open or short circuit using a multimeter. It is necessary to measure the resistance between the contacts on the motor housing. Normal values vary depending on the model, but are usually between 20 and 40 ohms for the run winding and slightly higher for the start winding. If the device shows zero or infinity, compressor it is faulty.
Another serious problem is mechanical jamming of the piston group. The motor tries to turn the shaft, but due to lack of lubrication or scuffing on the cylinders, this is impossible. At this moment, a buzzing sound is heard, turning into a click. Repair in this case is usually impractical; a complete replacement of the unit is required.
It is worth noting that old motors can simply exhaust their service life. If your refrigerator is more than 10-15 years old, wear and tear on internal parts becomes critical. In this case, frequent switching on and off is a harbinger of final breakdown.
Failures in the operation of the thermostat and sensors
The thermostat (or temperature sensor in electronic models) controls the operating cycles of the refrigerator. If this element is faulty, it may send incorrect signals to the control board or directly to the relay. However, most often a breakdown of the thermostat leads to the fact that the refrigerator either does not turn on at all or works without stopping.
However, there are cases of “floating” contact inside the thermostat. When vibration occurs, contact is lost and the motor stalls. To eliminate this cause, you can temporarily close the thermostat contacts (observing safety precautions). If the refrigerator works in normal mode, then the problem is in the temperature sensor.
In modern models with electronic control, they are responsible for monitoring the temperature NTC sensors. They are located in different areas of the chamber. If one of them produces erroneous temperature data, the board may block the start of the compressor to avoid overloading the system.
It is also worth checking the settings. In some models with a display, a failure in the electronics can simulate a breakdown. Try resetting the settings to factory settings by unplugging the appliance for 15 minutes.
Problems with electrical wiring and mains voltage
Unstable voltage in the electrical network is a common reason that the refrigerator turns on and turns off immediately. If the voltage drops below 190–200 volts, the starting current may not be enough to turn the rotor. The motor hums, but does not start, after which the protection is activated.
Check the condition of the socket and plug of the power cord. Melted plastic, blackened contacts or a burning smell indicate poor contact. At the point of poor connection, resistance arises, which “eats” part of the voltage, preventing the motor from starting. Replace the outlet or use an extension cord with quality contacts to check.
The internal wiring of the refrigerator may also be damaged. Rodents, vibration or just time do their job. Inspect the wires leading from the plug to the compressor and relay. If the insulation is broken or there are kinks, this can cause a short circuit when starting.
To protect expensive equipment, it is recommended to use a voltage stabilizer or voltage control relay. This is especially true for private houses and old apartment buildings, where surges in the network are not uncommon.
The influence of low voltage and inrush currents
It is especially worth highlighting the problem of low voltage during peak hours of load on the network. In summer or in the evening, voltage can drop to critical levels. At this moment, the refrigerator tries to start, but due to lack of power, the rotor does not take off.
Inrush current at the moment the compressor starts, the rated operating current is 3-5 times higher. If the network is “weak,” a voltage drop occurs, and the protective automation (both internal and external) turns off the device. This is a protective reaction that saves the windings from burnout.
If you notice that the problem only appears at certain times of the day, install a household stabilizer. It will equalize the voltage and ensure normal engine starting even with a poor network.
☑️ Diagnosis of electrical problems
Diagnostics and fault table
It is convenient to use the table to systematize symptoms and possible causes. It will help you quickly navigate the nature of the breakdown and understand which unit requires attention first.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| Buzzing 3-5 seconds, clicking, silence | Faulty starting relay | Low (part replacement) |
| Strong hum, heating of the motor housing | Compressor jamming | High (replacement compressor). thermostat |
| Clicks without buzz | Broken winding or wiring | Average (chain continuity) |
| Chaotic on/off | Thermostat is faulty | Low (sensor replacement) |
When performing diagnostics, always unplug the refrigerator before removing covers and touching electrical parts. Safety is priority number one.
If the problem persists after checking the relay and wiring, it is most likely an issue with the motor itself or the control board. In such cases, it is better not to experiment without professional equipment and knowledge.
Is it possible to knock out a compressor with a hammer?
There is a myth that if you hit a working (humming) compressor with a hammer, it will “get wedged.” In rare cases, this helps for a short time, but more often than not it completely kills the engine. It’s not worth the risk.
When you need to call a specialist
There are a number of situations when self-repair is not only useless, but also dangerous. If you identify a problem with the sealed circuit or the compressor itself, professional intervention is required. The master has the tools to work with freon and knows the intricacies of soldering copper pipes.
Also, the help of a professional is needed if the refrigerator is under warranty. Opening seals or replacing parts yourself will void the warranty. It is better to immediately contact an authorized service center.
Do not forget that modern refrigerators are equipped with complex electronics. An error in diagnosing the control board can lead to the purchase of unnecessary spare parts. Specialist will carry out an accurate diagnosis in 15–20 minutes and name the exact cost of repairs.
Regular maintenance and proper operation extend the life of the equipment. Do not place the refrigerator close to the wall, keep the condenser clean at the back and do not overload the chambers with food.
⚠️ Attention: If you smell burnt insulation or see sparking inside the case, immediately unplug the cord from the outlet. Further operation of such a device may lead to a fire.
⚠️ Attention: When working with the refrigeration circuit (if you decide to change the compressor), remember that there is refrigerant in the system. Its release into the atmosphere is prohibited by environmental regulations, and contact with the eyes or skin can cause frostbite.
Frequently asked questions (FAQ)
Why does the refrigerator click but does not turn on?
The click is usually made by the start relay or thermal protection. If the click is followed by a hum and a second click after a few seconds, the start relay is most likely burned out or the compressor is jammed. If there is a click, but the motor is silent, the problem is an open circuit or the relay itself.
Is it possible to temporarily short-circuit the relay to make the refrigerator work?
Theoretically, you can start the motor by applying voltage directly, but doing this is strictly not recommended without replacing the part. Operation without a working starting device will lead to rapid overheating and burning of the compressor windings. This is a temporary measure for 10–15 minutes, no more.
How much does it cost to replace a compressor?
The cost consists of the price of a new engine, the work of a technician, soldering pipes and refilling with freon. On average, this is one of the most expensive procedures in the repair of household appliances, often accounting for 50–70% of the cost of a new refrigerator.
Does the number of products in the refrigerator affect the start-up?
The number of products does not have a direct effect on the electric start of the motor. However, if you have just loaded a lot of warm food, the thermostat will keep the compressor on for a long time, but will not cause it to turn off immediately after starting. The “on-off” problem is of a technical nature.
What to do if, after defrosting, the refrigerator began to behave this way?
If you defrosted the refrigerator and after turning it on it began to click and stall, perhaps moisture got on the electrical contacts of the relay or wiring. Allow the device to dry completely overnight with the power turned off. If the problem remains, moisture has nothing to do with it, look for a mechanical breakdown.