Why the refrigerator is constantly defrosting - diagnostics and repair

Have you noticed that the refrigerator has stopped freezing like before? Food spoils faster, ice appears on the back wall, and then it melts, forming puddles? Or is the unit completely periodically switching offas if it had been pulled out of the socket? This behavior is not just an inconvenience, but a signal of a serious malfunction. If you ignore the problem, the consequences will be more expensive: from spoilage of all products to complete failure of the compressor after 2-3 months of constant overloads.

In this article we will analyze 7 main reasonswhy the refrigerator spontaneously defrosts - from banal No Frostfailure to critical breakdowns requiring the intervention of a specialist. You will learn how to diagnose the problem by external signs, what manipulations you can do yourself, and when it is better to immediately call a specialist. We have also collected symptom table possible “diagnoses” and the cost of repairs - this will help assess the scale of the disaster even before the technician’s visit.

1. Malfunction of the thermostat (thermostat)

The thermostat is the “brain” of the refrigerator, which monitors the temperature sends signals to the compressor to turn on/off. If it breaks, the compressor either works without stopping (which leads to icing), or stops starting altogether the refrigerator defrosts. Signs of a broken thermostat:

• 🔴 The compressor does not turn on, although the light inside is on
• 🔴 The refrigerator does not respond to changes in the position of the handle thermostat
• 🔴 In the freezer, the temperature rises to +10°C and above

How to check the thermostat yourself? Unplug the refrigerator, take out all the food and move the thermostat knob to the "Max" position (or "7"). Connect the power - if after 10-15 minutes the compressor does not start, the thermostat is faulty. In models with electronic control (for example Samsung RL Series or LG InstaView) there will be a touch panel instead of a knob - there the failure may be associated with control board.

⚠️ Attention: Do not try to disassemble the thermostat yourself - in some models it is connected to gas system. If the tubes are damaged, freon will come out, and repairs will cost 2-3 times more.

2. Freon leak - why the refrigerator “leaks” and does not freeze

Freon is a refrigerant that circulates through the system and removes heat out of the chambers. If a microcrack appears somewhere in the circuit (most often in soldering areas or on evaporator), the gas gradually evaporates. The refrigerator first works worse, then stops freezing completely. Signs of a leak:

• 💧 There are puddles of oil on the floor under the refrigerator (freon mixed with compressor oil)
• ❄️ The freezer is covered with ice, but not cools
• 🔊 The compressor works without stopping, but does not turn off

It is impossible to eliminate the leak on your own - it is required special equipment to vacuum the system and charge it with freon. The cost of repair depends on the model:

If the refrigerator is older than 10 years, the technician can advise do not repair the leakand to buy a new one - refilling freon will cost 30-50% of the cost of a new unit.

3. Compressor failure: when the refrigerator “hums, but does not” freezes"

The compressor is the "heart" of the refrigerator, which pumping freon throughout the system. If it fails, the refrigerator either does not turn on at all or operates jerkily, not having time to catch up with the cold. Typical symptoms:

• 🔊 The compressor hums, but does not start (relay clicks are heard)
• 🔥 The compressor body is hot (over 70°C)
• ⚡ The refrigerator turns off 1-2 minutes after starting

Reasons compressor breakdown:

1. Natural wear (service life - 10-15 years).
2. Overheating due to poor ventilation (the refrigerator is close to the wall).
3. Power surges (if there is no stabilizer).
4. Factory defect (found in models Beko and Vestfrost 2018-2020).

Replacing a compressor is one of the most expensive procedures (from 8,000 ₽). Before repairs, the technician must check:

If the compressor is “jammed”, it cannot be repaired - only replacement. In some cases, it is cheaper to buy a new refrigerator, especially if the old one is damaged. data-i="136">energy-intensive classes D-E energy-intensive classes D-E.

4. Problems with the No Frost system: why the refrigerator defrosts itself

The system No Frost should prevent the formation of ice, but if it breaks, the refrigerator starts "crying" Ice builds up on the back wall, then melts, and water accumulates below. The culprits of the problem are:

• 🌀 Faulty fan (does not blow cold air)
• 🔥 Burnt defrost heating element (ice does not melt normally mode)
• 💻 Failure of the defrost timer (in models Whirlpool, Electrolux)

How to check No Frost:

1. Turn off the refrigerator and defrost it for 12 hours.
2. Turn on and listen: if after 10 minutes you can’t hear the fan working, it’s broken.
3. Shine a flashlight into the freezer: if there is ice on the “coil” (evaporator), the heating element is not working.

Repair system No Frost costs 3,000–6,000 rubles. In models Samsung and LG it often fails defrost sensor - its replacement costs about 2,500 rubles. If the refrigerator is older than 8 years, a technician can do it. advise to turn it off No Frost and switch it to a drip system - it’s cheaper than repairing it.

What will happen if you don’t fix No Frost?

If you ignore the malfunction, ice will block the fan, the compressor will work on wear, and will burn out in 3-6 months. There is also a risk of short circuit due to melt water.

5. Clogged capillary tube: the refrigerator does not freeze, but the light is on.

The capillary tube is a thin channel through which freon enters the evaporator. If it becomes clogged (due to rust, oil or moisture), the refrigerant will not circulate and the refrigerator will stop freezing. Signs of a blockage:

• 🔴 The compressor works non-stop, but there is no cold
• 🔴 The condenser (grid at the back) is cold, although it should be warm
• 🔴 After turning off, the refrigerator does not start for a long time

The blockage can be eliminated flushing the system or by replacing the capillary tube. The cost of repairs is from 4,000 ₽. In 20% of cases, after flushing it is required refilling freonas part of it is lost during depressurization.

⚠️ Attention: Do not try to clean the tube yourself wire or air - this can damage its walls and aggravate the problem. For washing, a special solvent and equipment for purging with nitrogen are used.

6. Control board failure: the refrigerator is “buggy”

In modern refrigerators (for example, Liebert, Haier, Gorenje) electronic control boardis responsible for all processes. If it fails, the equipment behaves unpredictably:

• 🤖 The refrigerator spontaneously defrosts and turns on again
• 📛 Errors flash on the display (for example, E1, F2)
• 🔄 Modes switch chaotically (from Super Freeze to Holiday)

Causes of board failure:

• ⚡ Voltage surge (if there is no stabilizer)
• 💦 Moisture ingress (condensation from the back wall)
• 🕰️ Natural wear and tear (the board is designed for 7-10 years)

Repairing the board costs 3,000–8,000 rubles. In some cases, it can be reflash (if the failure is software), but more often it requires replacement. Samsung and LG boards are usually in stock, but for rare brands (for example, Mideayou have to wait 2-3 weeks.

7. External reasons: why the refrigerator defrosts without breakdowns

Sometimes the problem lies not in the equipment, but in wrong. operationCheck these points before calling a technician:

• 🔌 Unstable voltage: if the network is less than 190V, the compressor does not start. Solution - voltage stabilizer (from 2,000 ₽).
• 🌡️ High temperature in the room: if the kitchen is +30°C, the refrigerator will not cope. The norm is up to +25°C.
• 🚪 Frequent opening doors: every time warm air comes in, and the compressor does not have time to cool the chamber.
• 🧊 Overloading of the freezer: if the products are packed tightly, air circulation is disrupted.

Also check if the mode Holiday (vacation) or Eco - the refrigerator is not accidentally turned on operates at minimum power and can defrost.

⚠️ Attention: If the refrigerator is connected via an extension cord, check its contacts - poor contact can cause micro-interruptions in power supply, due to which the appliance “freezes” and defrosts.

FAQ: Frequently asked questions about defrosting the refrigerator

Is it possible to fill the refrigerator with freon yourself?

No. To refuel, you need vacuum pump, a manometer and a cylinder with freon. In addition, before refueling, the system must be checked for leaks - without a special leak detector, this is impossible. data-i="214">or repeated leakage or compressor overheating.

Why does the refrigerator defrost at night, but works normally during the day?

This a typical sign a faulty thermostat. data-i="224">voltage surges or power surges. At night, the voltage in the network often drops (due to shutdowns of industrial enterprises), and if it drops below 180V, the compressor does not start. Install stabilizer or voltage control relay.

How long can food be stored if the refrigerator is defrosted?

At room temperature (+20°C):

• 🥛 Milk, sour cream, yogurt - up to 2 hours
• 🍗 Raw meat/fish - up to 1 hour
• 🧀 Hard cheese - up to 4 hours
• 🥚 Eggs - up to 6 hours

If the refrigerator is partially defrosted (the temperature in the chamber is not higher than +10°C), the time increases by 1.5-2 times.

What to do if the refrigerator is defrosted, and the technician will arrive only after 2 days?

Follow the algorithm:

1. Take out all the products, pack them in thermal bags or wrap them in newspaper.
2. Place the bags in a basin with cold water and ice (change the ice every 4 hours).
3. Unplug the refrigerator and defrost completely (at least 12 hours).
4. Wipe all surfaces soda solution (1 tablespoon per 1 liter of water) to remove the smell.

How often do you need to defrost a refrigerator with No Frost?

Manufacturers claim that No Frost does not require defrosting, but this is not entirely so, once every 6-12 months, the refrigerator still needs to be:

• Unplug.
• Take out all the shelves and drawers, wash them.
• Wipe the door seals vinegar solution (1:1 with water).
• Leave for 2-3 hours with the door open for ventilation.

This will prevent the appearance of mold and unpleasant odors.