The situation when you open the refrigerator door and there is room temperature inside can unsettle any owner. It is especially alarming if The refrigerator compartment does not cooland the products begin to deteriorate literally before our eyes. This is not just a household trifle, but a signal that a serious failure has occurred in the complex refrigerant circulation or temperature control system. Unlike a freezer, which can keep cold longer due to dense freezing, the refrigerator compartment reacts to breakdowns almost instantly.
Before you panic and call a technician, it is important to conduct an initial diagnosis. Often the reason lies in trivial things: from a loose gasket to an accidental change in settings. However, in some cases the problem indicates a leak freon or failure of the compressor. Our task is to consistently eliminate simple options and understand whether the situation requires professional intervention or whether the repair can be done independently.
In this article we will analyze in detail the mechanics of the operation of different types of units, be it old models with drip system or modern devices with No Frost. You will learn how to distinguish a noisy motor from the sound of a dying unit, and why sometimes it is enough just to defrost the equipment to make it work again. A careful study of symptoms will help save time and money.
Primary diagnosis: analysis of symptoms and external signs
The first step is always a visual inspection and listening to the working device. If the refrigerator hums, but does not cool, this narrows the search range. A humming sound indicates that the electrical circuit is intact and the engine is trying to start or is idling. In this case, the problem most likely lies in the mechanical part: the compressor cannot create the necessary pressure or the refrigerant simply does not circulate through the system.
Pay attention to exactly how the equipment behaves. If you hear intermittent clicking sounds followed by silence, the thermal protection relay may be tripping. This happens when compressor overheats due to excessive load or trying to start with a locked rotor. Also an important indicator is the temperature of the back wall. Normally, it should be uniformly cold or frosted (depending on the system), but if it is warm or has local hot spots, this is a bad sign.
⚠️ Attention: If you smell a burning smell or see sparking in the area of the start relay, immediately unplug the unit. Operation of such a device can lead to a fire or complete burnout of the motor windings.
Check the tightness of the door. Even a microscopic gap, invisible to the eye, leads to a constant flow of warm air. Moisture from the air condenses and freezes, forming an ice coat, which ultimately blocks heat transfer. Rubber seal must be elastic and clean. If it is dry or contaminated with grease, the seal is broken and the chamber stops maintaining temperature, causing the motor to wear out.
Problems with the thermostat and temperature sensors
One of the most common reasons why The fridge compartment does not workis the failure of the temperature control system. In older models, a mechanical thermostat is responsible for this, and in modern ones, an electronic sensor (thermistor). If the device “does not see” a real increase in temperature inside, it simply does not give the command to turn on the compressor. Visually, this looks like complete silence and absence of cold.
In mechanical thermostats, the capillary tube often breaks or the tightness of the bellows is lost. As a result, the pressure inside the control system does not change and the contacts do not close. In electronic models thermistor it can simply change its resistance, sending false data to the control module that it is already “polar night” in the chamber. Diagnostics of such elements requires a multimeter to check the continuity of the circuit.
- 🔌 Checking contacts: Make sure that the wires going to the thermostat are not oxidized and are securely fastened.
- ❄️ Test: For mechanical thermostats there is a test method cooling, but it requires caution and accuracy.
- 📉 Resistance measurement: Electronic sensors are checked for resistance compliance at a certain temperature.
Replacing the thermostat is a procedure available to a home craftsman if there is access to the unit. However, modern models may require flashing the module or complex calibration. If after replacing the sensor the situation has not changed, the problem may lie deeper - in the control unit itself, which has stopped supplying voltage to the actuators. electronic control Module flashing or complex calibration may be required. If after replacing the sensor the situation has not changed, the problem may lie deeper - in the control unit itself, which has stopped supplying voltage to the actuators.
How to check a mechanical thermostat without instruments?
Remove the thermostat, short-circuit the two wires coming from the network directly (bypassing the thermostat itself). If the refrigerator turns on and starts to freeze, it means that the regulator is faulty. Be careful with electricity!
Faults of the compressor and start relay
The heart of any refrigerator is the compressor. If The fridge compartment does not cooland the motor is silent or makes strange sounds, the problem may be in the start-up relay. This small device, which is placed on the contacts of the compressor, is responsible for starting the engine and protecting it from overloads. Inside the relay there is a coil and contacts that can burn or stick over time.
A frequent picture of a malfunction looks like this: a click is heard, the motor hums for a few seconds, then another click and silence follows. This is a classic symptom of a wedge start or a faulty relay. In some cases, replacing the relay itself helps, which is inexpensive. However, if during startup you hear a dull knock or a strong hum that turns into vibration, the compressor itself may have jammed. piston mechanism compressor.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| Clicking and silence | Malfunction of the starting relay | Low |
| Humming and heating of the case | Stuck compressor | High (replacement) |
| The motor runs constantly | Freon leakage or wear | Medium/High |
| Strong vibration and noise | Destruction of the motor mount | Average |
If the compressor is hot to the touch, but does not start, trying to start it using “makeshift” methods (for example, applying voltage directly) is extremely dangerous. This may cause a short circuit. In the event of a confirmed breakdown motor-compressor it requires its complete replacement, which is a complex procedure that requires evacuation of the system and charging with refrigerant.
Refrigerant leak and capillary tube clogging
If the motor runs almost non-stop, hums smoothly, but there is no cold at all or it is very weak, most likely there is no working fluid in the system - freon. The refrigerant circulates in a closed circuit, and if a microcrack has formed somewhere (often in the foamed part of the housing or in the condenser at the back), the gas gradually escapes. Without freon, heat is not removed from the chamber.
Another common problem is clogged capillary tube. This is a very thin tube in which freon is throttled. Over time, oil oxidation products or moisture can accumulate in the system, which turns into ice or oil plugs. The circulation stops and the refrigerator stops cooling, although the compressor continues to idle gas.
- 🔍 Visual search: Look for oily spots on the back wall or bottom of the refrigerator - freon leaves along with the oil.
- 🌡️ Tube temperature: If there is a leak, the condenser tubes may be cold and not hot, as they should be.
- 🧊 Local frost: If there is a partial blockage, frost may appear only at the beginning (of the evaporator).
⚠️ Attention: Freon leakage and blockages are classified as complex technical faults. To eliminate them, specialized equipment is required: a vacuum pump, a pressure gauge station and a refueling scale. It is almost impossible to find a leak in a foamed case on your own.
Failures in the operation of the No Frost and defrost system
In refrigerators with a system No Frost the reasons for the lack of cold often lie in a violation of the defrost cycle (evaporator). If the defrost heating element, timer or defrost sensor fails, the evaporator becomes coated with ice. The fan, which is supposed to drive cold air into the chamber, either stops due to ice, or drives warm air because the ice blocks heat exchange.
In this case, you can hear the motor running, but there is no cold coming from the ventilation holes in the chamber. Sometimes ice blocks the fan blades and you may hear a cracking or humming sound coming from deep inside the freezer or refrigerator. Over time, a block of ice can completely block the air supply channels.
Diagnostics of the defrost system includes checking the integrity of the heating element and the resistance of the sensors. If Defrost heating element it burns out, the ice does not melt and the system goes into emergency mode. In some models, the emergency indicator lights up, in others, the refrigerator simply stops cooling, continuing to work in vain.
☑️ Diagnostics No Frost
Influence of operating mode and external factors
Before committing a breakdown, it is worth analyzing the conditions in which the equipment operates. If The refrigerator compartment does not cool in the summer, when the apartment is hot, the reason may be overheating of the condenser. If the refrigerator is located close to the wall, in a niche or next to a radiator, it cannot effectively transfer heat. The motor works at the limit, but cannot cope with the heat flow.
It is also important to consider the volume of loaded products. If you put a large pot of hot soup or a lot of room-temperature food in the compartment, the refrigerator may temporarily become unable to cope with the load. In this case, thermostat the compressor will be kept on for a long time, but the temperature will drop slowly.
Another factor is the position of the refrigerator. If the equipment is not level, the door may not close completely on its own, breaking the seal. Adjusting the legs is a simple operation that often solves the problem of constant ice freezing and loss of cold. Make sure the door is tilted slightly back, ensuring a tight slam.
Frequently asked questions (FAQ)
Why does the refrigerator click but does not turn on?
A click is usually made by a starting relay or thermal protection relay. If the click is followed by a buzzing sound and then clicks again a few seconds later, the compressor is trying to start but is unable to. Reasons: faulty start relay, jammed compressor or low voltage in the network.
Is it possible to use a refrigerator if it does not freeze, but works?
It is strictly not recommended. If the chamber does not cool, the food will begin to deteriorate, creating a risk of poisoning. In addition, if the cause is a freon leak, the compressor will work non-stop, trying to gain temperature, which will lead to its overheating and burning of the windings.
How long does it take for the refrigerator to gain cold after defrosting?
Usually the process of initially gaining temperature takes from 2 to 4 hours. If after 5-6 hours of operation at maximum power the chamber remains warm, then there is a technical malfunction.
Why is the back wall of the refrigerator warm and not cold?
In a working refrigerator, the back wall inside the chamber should be cold. If it is warm, this may indicate that the compressor is running, but the freon is not circulating (clogging) or there is not enough freon (leaking). Also, a warm wall can occur when the fan in the No Frost system is not working.
What to do if an ice coat has formed in the chamber?
It is necessary to completely defrost the refrigerator. Unplug it, open the doors and leave it for at least 12-24 hours (preferably a day). Do not use a hairdryer or knife to crush ice as this may cause damage. If after defrosting the cold appears, but after a couple of days it disappears again, the problem is in the defrosting system.