Why the refrigerator lights up: main reasons and safety measures

The refrigerator is the only household appliance that operates non-stop 24 hours a day, 7 days a week, without turning off for many years. It is this continuous operation that creates a colossal load on all internal systems, from the compressor to the electrical wiring, which in rare cases can lead to a critical situation. Fire department statistics show that malfunctions of refrigeration equipment cause a significant number of household fires, and understanding the physics of this process can save lives and property.

Many equipment owners mistakenly believe that the low temperature inside the chamber automatically protects the device from overheating, but this is a dangerous misconception. Heat release does not occur inside the refrigeration chamber, but outside, in the engine compartment, where the main components that generate heat during operation are located. It is here, in a space hidden from view, that processes leading to ignition can develop if alarm signals are not noticed in time.

In this article we will analyze in detail the technical and operational factors that contribute to the occurrence of a fire, as well as algorithms for action when a malfunction is detected. Ignoring the first signs of overheating or strange sounds (strange sounds) often becomes a fatal mistake. Understanding how your unitworks will allow you to react in time and prevent a disaster.

Electrical wiring and problems with the power supply

The most A common cause of fire is simple non-compliance with the rules for operating electrical networks. Old wiring in the house, the use of low-quality extension cords, or connecting a powerful refrigerator to the same outlet as a microwave oven and kettle leads to overload. In places of poor contact, local overheatingoccurs, which melts the insulation of the wires and can cause a short circuit.

Particular attention should be paid to the condition of the power cord of the refrigerator itself. Over time, the insulation dries out, cracks and exposes the conductive wires. If such a cord touches metal parts of the housing or other wires, a breakdown occurs. In modern models with the system No Frostthat consume more energy, the risk increases, since the currents in the circuit are higher, and even a small insulation defect can become fatal.

Also the cause may be a malfunction of the internal wiring inside the engine compartment. Vibrations that occur during compressor operation gradually weaken the fastenings of the wires, which leads to them rubbing against metal structural elements. A bare wire, in contact with the body, gives a spark, which, in an environment saturated with dust and fluff, instantly causes smoldering.

⚠️ Attention: If you notice that the refrigerator plug or socket gets very hot when touched, immediately stop using the device and call an electrician to check the wiring.

Power surges in the network are also a critical factor. Sudden changes can break through the insulation of the motor windings or damage the control electronics, which is sometimes accompanied by internal fire of board components.

Faults of the compressor and start relay

The heart of the refrigerator is the compressor, and it is this that most often becomes the epicenter of the problem during mechanical breakdowns. In normal operation, the motor housing heats up to 60-90 degrees Celsius, which is the standard temperature. However, when the piston group jams or the bearings wear out, the engine begins to operate with overload, consuming a current that significantly exceeds the rated values.

The key element of protection here is starting relay. Its task is to start the engine and turn off the starting winding. If the relay gets stuck closed or does not open the circuit in time, high current continues to flow into the starting winding. This leads to instant and powerful heating of the windings, charring of the insulation and, ultimately, to open combustion inside the compressor casing.

The situation is aggravated if the refrigerator is installed close to the wall or in a niche without proper ventilation. In such conditions, heat is not removed from the wear-out compressor, and the temperature in the engine compartment increases like an avalanche. Plastic parts, dust and grease deposited on the condenser grille become an ideal environment for the spread of fire.

It is important to distinguish between normal heating and emergency heating. If, after touching the back wall or engine compartment, burns remain on your hand, or you smell burning wiring, this is a direct signal of a malfunction motor-compressor or control system.

Refrigerant leakage and freon ignition

For a long time it was believed that refrigerators were fireproof due to the use of inert gases, however The modern environmental agenda has made its own adjustments. Manufacturers are massively switching to the use of hydrocarbon refrigerants, such as isobutane (R600a) and propane (R290). These substances have excellent cooling properties, but are flammable gases.

When the circuit depressurizes and such freon leaks, the gas, being heavier than air, falls down and accumulates in the lower part of the engine compartment or on the kitchen floor. If at this moment a spark occurs - from a relay, thermostat or simply static electricity - a volumetric explosion or flash occurs. The concentration of gas in the air reaches explosive limits very quickly, especially in a confined space in a niche.

Older models running on R12 or R134a freon are less likely to ignite the gas itself, but their leakage is also dangerous. When an open flame comes into contact with refrigerant vapor, a chemical warfare agent can be formed. Therefore, extinguishing a refrigerator with water without turning off the electricity or in the presence of an open flame is strictly prohibited. Phosgene - a chemical warfare agent. Therefore, extinguishing a refrigerator with water without turning off the electricity or in the presence of an open flame is strictly prohibited.

The influence of pollution and heat transfer disturbances

The accumulation of dust, animal hair and kitchen grease on heat exchangers (black grille at the back or foam walls) is the “silent killer” of your equipment. The capacitor is designed to release heat to the environment. When it is covered with a dense layer of “coat” of dirt, heat transfer stops.

As a result, the compressor is forced to work non-stop, trying to reach the set temperature. The engine operating time increases significantly, which leads to its overheating. At a critical moment, the insulation of the windings may fail or the plastic fastening elements located in the immediate vicinity of the hot tubes may melt.

In addition, organic dust, when heated for a long time to high temperatures (above 200-300 degrees, which is possible in the compressor discharge zone), is capable of spontaneous combustion. This phenomenon is called pyrolysis. Smoldering dust can spread to plastic parts of the case or wiring, initiating a fire.

Regular cleaning behind the refrigerator is not just a matter of aesthetics, but a necessary fire safety measure. This is especially true for kitchens, where there is a lot of fatty fumes in the air, which settle in a sticky layer on the radiator.

⚠️ Attention: Never try to break off the ice in the freezer with sharp objects. A puncture of the evaporator will lead to an instant release of freon, which, upon contact with the atmosphere, can ignite from a spark of static electricity.

Human factor and improper operation

Often the cause of a fire is not a breakdown of equipment, but the actions of the user himself. Drying things on the back rack of the refrigerator is a common but extremely dangerous habit. The fabric that blocks the access of air is heated by the operating condenser and can catch fire, especially if the fabric contains synthetic fibers.

Using the refrigerator for other purposes also carries risks. For example, storing flammable liquids (alcohol, acetone, ethers) in open containers in the freezer. Vapors of these substances, mixing with air and escaping through leaks in the seal, can create an explosive mixture that detonates (explodes) from a spark when the light is turned on or the thermostat is operating.

Attempts at self-repair without proper qualifications are another risk factor. Poorly performed soldering of tubes, the use of unsuitable materials for insulation or incorrect assembly of the electrical part after cleaning can lead to a short circuit at the most inopportune moment.

Algorithm of action in case of fire

If you notice smoke, sparks or an open flame in the area of the refrigerator, you need to act instantly and in cold blood. The first and most important step is complete blackout the device. Do not attempt to simply unplug the plug if it is already burning or melted - this may result in an electric shock. It is necessary to turn off the automatic switch (switch) in the input panel of the apartment or house.

After turning off the electricity, you can start extinguishing. It is strictly forbidden to use water to extinguish electrical appliances and flammable gases, as it conducts current and can cause a short circuit in the remaining sections of the wiring, as well as lead to the splashing of burning substances. Use a class fire extinguisher CO2 (carbon dioxide) or a powder fire extinguisher.

If there is no fire extinguisher and the flame is small, you can try to cover the fire with a thick cloth (blanket, bedspread), previously moistened with water, to block the access of oxygen. However, this can only be done after making sure that the electricity is definitely turned off. If the fire has engulfed a large area or there is a threat of a freon cylinder exploding, immediately leave the room, close the door and call the fire department.

Remember that a burning refrigerator emits extremely toxic fumes (extremely toxic fumes) from combustion products of plastic, insulation and refrigerants. Staying indoors without respiratory protection is deadly.