The situation when you open the refrigerator door, and there is room temperature, always takes you by surprise. Products begin to deteriorate, and expensive repairs or replacement of equipment looms on the horizon. Often panic forces you to make unnecessary movements, although the problem may lie in simple things that can be easily fixed on your own.
Before calling a technician or looking for a new unit, it is necessary to carry out an initial diagnosis. In most cases, if the refrigerator does not freeze, this indicates a violation of the tightness of the circuit, failure of the electronics, or a simple overload of the system. Understanding the principles of operation of the compressor and thermostat will help you more accurately describe the problem to a specialist or even repair the equipment yourself.
In this article we will analyze in detail the mechanical and electrical malfunctions that lead to loss of cold. You will learn how to distinguish a serious breakdown from a temporary failure and what to pay attention to first. The main thing is not to ignore the first signs of unstable operation in order to prevent the stocks from completely defrosting.
Checking the power supply and thermostat settings
The most commonplace, but often overlooked reason is the lack of voltage in the network or broken settings. If the refrigerator is turned on but is not freezing, first check whether the light on the control panel is on. Its absence may indicate problems with the socket, plug or internal fuse of the equipment. operation indicator on the control panel. Its absence may indicate problems with the socket, plug, or internal fuse of the equipment.
Often users accidentally touch the temperature regulator, switching it to the minimum cooling or complete defrosting mode. In models with electronic control, a failure in the settings may occur due to a power surge. You must make sure that the correct operating mode is set to match the current load of the cameras.
⚠️ Attention: If you find that the plug or power cord gets very hot during operation, immediately unplug the device. Using a damaged cable may result in a short circuit or fire.
You should also pay attention to the tightness of the door. If seal is worn out or dirty, cold air will escape and warm air will flow in. The compressor will work continuously, trying to compensate for heat loss, but effective cooling will not occur. Check the cleanliness of the rubber and the absence of cracks around the entire perimeter.
Sometimes the problem lies in the location of the equipment. If the refrigerator is placed close to a wall or furniture, air circulation around the condenser is disrupted. This leads to overheating of the system and automatic shutdown of the compressor by automatic protection. Maintaining a distance from the walls is a prerequisite for stable operation.
Malfunctions of the defrosting system in No Frost
In refrigerators with a system No Frost loss of cold is often associated with a malfunction of the defrosting system. If the evaporator is covered with a thick layer of ice (“coat”), air cannot circulate through the chambers. As a result, the refrigerator compartment is warm, although the freezer may still maintain a low temperature.
The main elements of the defrost system are Heating element (heater), defrost sensor and timer (or electronic module). If one of these components fails, the ice does not melt, but accumulates, blocking the cold air passages. Diagnostics requires disassembling the back wall of the freezer.
- 🔥 Burnt heating element: The heating element stops heating, and the ice does not melt even during the defrost cycle.
- 🌡️ Faulty sensor: the "brain" of the system does not receive a signal that the ice has melted, or vice versa, does not give a command to turn on the heating.
- ⏱️ Timer failure: the mechanism for switching the "cooling-defrosting" modes is stuck in one position.
⚠️ Attention: When checking the heating element and sensors, be sure to disconnect the refrigerator from the power supply. Working with live electrical wiring is deadly.
For diagnostics, the method of complete manual defrosting is often used. If after 24 hours of shutdown the refrigerator begins to freeze normally, but after a few days the problem returns, the defrosting system is to blame. This confirms that the compressor and freon are in order, but ice again blocks operation.
How to check the heating element with a multimeter?
To check the heating element, you need to “ring” it with a multimeter in resistance measurement mode. If the device shows infinity (break), it means that the heater has burned out and requires replacement. Normal resistance is usually several tens or hundreds of Ohms.
Refrigerant (freon) leakage and problems with the compressor
One of the most serious reasons why the refrigerator turns on but does not freeze is a leak refrigerant. Freon circulates in a closed circuit, taking heat from the chambers. If a microcrack appears in the system, the gas evaporates and cooling stops completely or becomes insufficient.
The compressor is the “heart” of the refrigerator. If it hums, but does not start, or, conversely, works silently, although it should freeze, this is a sign of a breakdown. In modern inverter models, diagnostics are more complicated, since they can operate in different modes, but the principle remains the same: no movement of freon - no cold.
Signs of a freon leak or problems with the compressor often appear visually:
- ❄️ Local freezing: it freezes only at the back wall or in the corner, and the rest of the space is warm.
- 🔊 Strange sounds: gurgling, hissing or complete absence of the characteristic hum of a running motor.
- 🌡️ Hot condenser: the grille at the back can be either barely warm or hot, which is not normal.
⚠️ Attention: Self-filling the refrigerator with freon is impossible without special equipment and skills. Trying to do this “by eye” will result in damage to the compressor.
If you suspect a leak, pay attention to the oil around the compressor or pipes. Sometimes the location of the leak can be found by oily stains. However, most often the use of a leak detector is required. Repair in this case involves finding the leak, soldering and vacuuming the system.
Clogged capillary tube and filter drier
There is a narrow section in the freon circulation system - capillary tube. It serves as a throttle, creating a pressure difference. Over time, a blockage may form in it due to oil oxidation products, moisture or debris that got in during poor-quality previous capillary tube repairs.
further repairs.
The symptoms of a blockage are often similar to a freon leak: the refrigerator works, but there is no cold. However, there is a difference: the compressor can work for a very long time without shutting down, and the condenser (grid at the back) will only be partially warm - up to the point of blockage. Once clogged, the tube will be cold or at room temperature.
The filter drier installed in front of the capillary tube may also become clogged. Its task is to remove moisture from the system. If the filter is overfilled or coked, the permeability of the system drops critically. In such cases, it is necessary to replace the filter and purge the system with nitrogen.
Diagnosing a blockage at home is difficult and requires a professional approach. The master determines the pressure at the inlet and outlet of the capillary tube. If the discharge pressure is too high and the suction pressure is low (vacuum), this is a sure sign hydraulic resistance in the system.
Table: Comparison of symptoms and probable causes
To simplify the initial diagnosis, we suggest that you familiarize yourself with the table, which will help compare the observed signs with possible malfunctions. This will allow you to roughly understand the scale of the problem before a specialist arrives.
| Symptom | Probable cause | Difficulty of repair | Do you need a technician |
|---|---|---|---|
| It hums, but does not freeze, cold condenser | Freon leak | High | Yes |
| There is a coat of ice in the freezer, there is heat in the refrigerator compartment | Faulty defrost system (No Frost) | Average | Desirable |
| The compressor hums for 10-20 seconds and clicks, then silence | Start relay or compressor wedge | Medium/High | Yes |
| It freezes slightly, the compressor works without stopping | Clogged system or loss of tightness | High | Yes |
| Sometimes it freezes, sometimes it doesn't | Problems with the thermostat or electronics | Low/Medium | You can do it yourself |
It is important to understand that the table gives only an approximate idea. An accurate diagnosis can only be made by a specialist using a manometric manifold and testers. Self-diagnosis is good for making a decision: call a technician or try to defrost the equipment.
Problems with electronics and thermostat
In modern models, electronic control moduleis responsible for the temperature regime. It receives signals from many sensors. If one of the sensors (for example, the temperature sensor in the refrigerator compartment) is lying, the module may “think” that there is cold and not turn on the compressor.
In older models or budget options, a mechanical one is used thermostat. This is a simple device that opens the circuit when a certain temperature is reached. If its contacts are stuck or the bellows loses its seal, the circuit will not close and the compressor will not start. Replacing the thermostat is one of the most common and inexpensive repair procedures.
Diagnostics of electronics requires knowledge and tools. Checking the thermostat is simpler: you can “short-circuit” it directly (for testing) or ring it with a tester. If the refrigerator starts when the contacts are closed, the thermostat is at fault. In the case of electronics, it is often necessary to reflash or replace the board, which is not always economically justified.
☑️ Initial diagnostics with your own hands
When complete defrosting is required
Sometimes the answer to the question “why is it not freezing?” refrigerator" lies in the banal freezing of the evaporator, even in No Frost systems, if the defrost cycle was skipped due to a power surge. Complete defrosting is the first thing the technicians advise you to do over the phone.
The procedure is simple: you need to unplug the refrigerator, open all the doors and leave it for at least 24 hours (preferably for a day). During this time, all hidden ice in hard-to-reach places (inside walls and channels) will have time to melt and evaporate.
It is important not to speed up the process with a hairdryer or boiling water, since a sharp temperature change can damage the plastic or cause cracks in the evaporator. After defrosting, wipe the chambers dry and turn on the equipment without loading food. If after a few hours cold appears, the problem is solved.
If, after a day of defrosting, the refrigerator started working for a couple of hours, and then stopped freezing again, this confirms the presence of a technical malfunction (leak, blockage, sensor failure). In this case, further independent actions are pointless and require professional intervention.
Is it possible to use a refrigerator if it has stopped freezing?
Short-term storage of food at room temperature in a closed chamber is possible for several hours. However, if the problem is not resolved within 4-6 hours, the products (especially meat and dairy products) begin to spoil. It is better to move them to another place or use them.
How much does it cost to repair if the refrigerator does not freeze?
The cost depends on the reason. Replacing the thermostat or start relay is inexpensive. Refilling with freon and finding leaks is more expensive because it requires materials and complicated work. Replacing the compressor is the most expensive option, often comparable to buying used equipment.
Why does a refrigerator freeze only in the freezer?
Most often this indicates a problem with air circulation between the chambers. In No Frost systems, the air supply channel could be clogged with ice (defrost malfunction). In single-compressor models, the damper that regulates the flow of cold, or the thermostat, which “does not see” the temperature in the main chamber, may have failed.
What to do if the compressor is hot, but does not work?
If the compressor is hot, but does not start (a clicking and humming noise is heard), the thermal protection relay may have worked or the starting one is faulty relay Allow the equipment to cool (30-40 minutes). If after turning on the situation repeats, the start relay needs to be replaced or the compressor itself needs to be repaired.