Defrosting a refrigerator is a procedure that many owners carry out regularly, but rarely think about what happens to the equipment after it is completed. Continuous operation time of the compressor after switching on is a key indicator that can tell about the condition of the unit. Some users panic when they hear that the refrigerator does not turn off for two hours, others calmly leave it running overnight, unaware of possible problems.
In fact, the duration of operation depends on many factors: type of cooling system (drip, No Frost, Low Frost), volume of chambers, temperature room, product load and even compressor model. In this article, we’ll figure out what indicators are considered normal, and when you should contact a specialist. You will also learn how to speed up the return to operating mode and avoid typical mistakes during defrosting.
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Why does the refrigerator work for a long time after defrosting: the physics of the process
After defrosting, the refrigerator turns on the network and begins to actively cool the internal space. The compressor works without stoppinguntil the temperature in the chambers will reach the specified values. This is a normal process, but why does it take so long?
It's all about thermal inertia. Even after removing the ice, the walls of the refrigerator remain warm, and the air inside warms up to room temperature (20–25°C). The compressor needs time to:
- 🔹 Cool the air in the chambers to +5...+7°C (for the refrigerator compartment) and −18°C (for the freezer).
- 🔹 Reduce the temperature of the walls and shelves that accumulate heat.
- 🔹 Overcome heat inflows from the outside (if the door was opened during defrosting or the room is hot).
In modern models with No Frost the process may take less time due to forced air circulation, but there are nuances here too. For example, refrigerators Samsung RB37J5240SA or LG GA-B489YGQZ are equipped with inverter compressors that smoothly regulate power, but even they will not be able to instantly cool an empty unit in the heat.
Norms for operating time of a refrigerator after defrosting: table by type
How many hours should a refrigerator operate after defrosting for this to be considered normal? There is no definite answer, but there are average indicators for different types of equipment. Below is a table with approximate values for empty refrigerators at room temperature (20–22°C).
| Refrigerator type | Volume (liters) | Compressor continuous operation time | Notes |
|---|---|---|---|
| Drip (single-chamber) | up to 200 | 1–2 hours | Cools quickly due to the small volume, but is sensitive to overload. |
| Drip (double-chamber) | 200–350 | 2–4 hours | The freezer can take up to 6 hours when fully loaded. |
| No Frost (Full No Frost) | 300–400 | 1.5–3 hours | Fans speed up cooling, but energy consumption is higher. |
| Low Frost / Frost Free | 250–350 | 2–3.5 hours | Combined system: drip evaporator + partial No Frost. |
| Side-by-Side (with dispenser) | 400+ | 3–5 hours | Larger volume and additional functions increase the time. |
Critical indicator: if the refrigerator operates without stopping for more than 8-10 hours with empty chambers and room temperature, this is a signal of a possible malfunction (freon leak, thermostat failure, clogged capillary tube).
It is important to consider that in hot weather (above 28°C) the operating time can increase by 20-30%. The duration is also affected by first turn on after purchase new refrigerators (for example, Bosch KGE39XW2AR or Indesit DF 5200 W) can work for up to 12-15 hours in a row until they reach the optimal mode.
5 reasons why the refrigerator does not turn off after defrosting
If more than 6-8 hours have passed and the compressor is still running without pause, check the following points:
- Incorrect loading of food. Hot foods, tightly packed containers or overcrowded shelves are blocking air circulation. For example, if you put warm soup in a large pan in the freezer, the refrigerator will take 30–40% more time to cool.
- High room temperature. If the refrigerator is located next to the stove, radiator, or on the sunny side, heat inflows cause the compressor to work harder. The optimal temperature for operation is 16–22°C.
- Malfunction of the thermostat or temperature sensor. In models Atlant MXM 2835-90 or Biryusa 140 the thermostat often fails, which is why the compressor does not receive a signal that the desired temperature has been reached.
- Leakage of refrigerant (freon). If the refrigerator works without stopping, but does not freeze, the system may have depressurized. Signs: the condenser (grid at the back) does not heat up, but the compressor is hot.
- Clogged capillary tube or filter drier. This leads to disruption of freon circulation and increased load on the compressor. More often found in older models (Stinol 102, Minsk 126).
How to check the thermostat yourself?
Disconnect the refrigerator from the network, remove the thermostat protective cover (usually located inside the chamber or on the top panel). Carefully disconnect the wires and connect them together (for example, with a paper clip). If the compressor starts, the thermostat is faulty and requires replacement.
If you are not sure of the reason, do not try to disassemble the refrigerator yourself - contact a service center. For example, repair. Freon leaks cost 3–5 thousand rubles, and replacing a compressor costs up to 10 thousand, so it is better to diagnose the problem at an early stage.
How to speed up the refrigerator's return to operating mode: step-by-step instructions
To reduce the time of continuous operation of the compressor after defrosting, follow these recommendations:
Wipe dry all surfaces (walls, shelves, seals)|Make sure the door closes tightly (check the seal)|Do not load food right away - let the refrigerator run empty for 1-2 hours|Set the thermostat to medium (usually the "3" or "Eco" position)|Open the door for 5-10 minutes before turning on to even out the temperature-->
Additional tips:
- 🌡️ If the room is hot, temporarily reduce the temperature using an air conditioner or fan (do not direct the air flow directly at the refrigerator!).
- ❄️ For models with No Frost after defrosting, turn on the mode
Super FreezeorFast Coolfor 1-2 hours - this will speed up cooling. - 🔌 Do not connect the refrigerator to the mains immediately after washing - let the moisture evaporate (15-20 minutes).
For refrigerators with electronic control (for example Liebherr CNef 4315 or Electrolux ERN 1200 FOW) you can use the function Holiday Mode (vacation mode) at first - it maintains a minimum temperature, reducing the load on the compressor.
What to do if the refrigerator runs for days: diagnostics and solutions
If the compressor does not turn off for more than 10-12 hours, and the temperature in the chambers does not correspond to the set one, follow the algorithm:
- Check the door seal. A damaged or dirty seal allows warm air to pass through. Carry out a test: close the door by inserting a sheet of paper between it and the body. If the sheet is easily pulled out, the seal requires replacement.
- Estimate the temperature of the condenser. Normally, the grille on the back wall should be warm (40–50°C). If it is cold, there may be a freon leak; if it overheats, the system is clogged or the compressor is faulty.
- Listen to the compressor. Normal sound is a uniform hum. If you hear clicks, knocking or vibration, these are signs of mechanical failure.
- Reset settings. In electronic models (for example, Samsung RL38TDCAS), try turning off the refrigerator for 10 minutes, then turning it on again. Sometimes software failures lead to continuous operation.
If self-diagnosis does not help, call a technician. The average cost of a specialist visit is 1,500–2,500 rubles, but the exact price depends on the region and the complexity of the repair.
⚠️ Attention: Do not ignore the long-term operation of the compressor! Constant overload leads to overheating of the motor windings and reduces the service life of the refrigerator by 30–40%. In critical cases, the starting relay may fail or the winding may break.
Frequent defrosting errors that lead to breakdowns
Many users unintentionally shorten the life of their refrigerator due to incorrect actions during defrosting. Here are the most common mistakes and their consequences:
- 🚫 Use of sharp objects to remove ice. Knives, forks or spatulas damage the evaporator and tubes, which leads to freon leakage. In models Indesit BIAA 13 or Beko CNK 335120 the evaporator is often located close to the walls - it is easy to puncture.
- 🚫 Turning on the refrigerator immediately after washing. Moisture remaining on the parts can cause a short circuit in the electronics or corrosion of metal elements. Always wipe dry!
- 🚫 Defrosting in a hot room. If the temperature is above 30°C, the compressor will wear out. In extreme cases, this leads to the thermal protection tripping and shutting down the refrigerator.
- 🚫 Ignoring strange sounds after turning on. Extraneous noise (creaking, crackling, gurgling) may indicate moisture entering the system or a fan failure. For example, in refrigerators No Frost the fan blades sometimes freeze up and touch the body.
Another typical mistake is incorrect temperature setting after defrosting. Many people set the regulator to maximum (position “5” or “7”), hoping to speed up cooling, but this only increases the load. The optimal mode for most models is “3” or “Eco”.
⚠️ Attention: If, after defrosting, rusty spots appear on the back wall of the refrigerator, this is a sign of corrosion of the condenser. Do not paint over them - contact service! Corrosion can lead to freon leakage and compressor failure.
How long should a refrigerator operate after defrosting: opinions of experts and manufacturers
Refrigerator manufacturers rarely indicate the exact operating time after defrosting in the instructions, but indirect recommendations can be found in the technical documentation. For example:
- Bosch in the manual for the model KGE39XL20R mentions that the first turn on can take up to 12 hours, and after defrosting - up to 6 hours at room temperature.
- LG for the line InstaView Door-in-Door recommends not loading products within 2 hours after turning on, so that the system has stabilized.
- Atlant in the instructions for the models MHM 170-80 i MHM 1843-100 warns that in the hot season the compressor operating time may increase by 25–30%.
Service engineers note that the main criterion for normal operation is not so much time as achieving the set temperature. If after 4–5 hours in the refrigerator compartment it is +4…+6°C, and in the freezer compartment −18°C, then everything is in order, even if the compressor has not yet turned off.
At the same time, the masters for repairing refrigerators (for example, from the services "RemBytTech" or "Cold Service") warn:
⚠️ Attention: If the refrigerator after defrosting works without stopping, but the temperature in the chambers does not drop below +10°C (when the thermostat is set to "3"), this is a sign of a freon leak in 90% of cases. Self-repair is not possible here - the system must be evacuated and charged with refrigerant.
For owners of refrigerators with No Frost For example, in Samsung RB30J3000WW the work/rest cycle is 10–15 minutes, while in In drip refrigerators, pauses can reach 30–40 minutes.
FAQ: Answers to frequently asked questions about the operation of the refrigerator after defrosting
My refrigerator has been running for 5 hours without stopping - is this normal?
Yes, for most models this is acceptable, especially if the refrigerator is large (300+ liters) or loaded products. However, if after 6-8 hours the compressor still does not turn off, check the temperature in the chambers. If it does not correspond to the specified value (for example, in the freezer -10°C instead of -18°C), this is a reason for diagnosis.
After defrosting, the refrigerator hums and vibrates a lot. What to do?
This can be caused by several reasons:
- 🔹 Incorrect installation (the refrigerator is not level, touching walls or furniture).
- 🔹 Moisture on the fan (in models No Frost).
- 🔹 Wear compressor shock absorbers (typical for refrigerators older than 7 years).
Try to level the refrigerator and let it operate for 1-2 hours. If the noise does not disappear, call a technician.
Is it possible to turn on the refrigerator immediately after transportation?
No, after transportation (especially in a horizontal position) it is necessary! wait:
- 🔹 2–4 hours if the refrigerator was transported vertically.
- 🔹 8–12 hours if it was lying on its side (so that the oil from the compressor flows back).
Ignoring this rule can lead to water hammer and breakdown compressor.
Why did an unpleasant smell appear in the refrigerator after defrosting?
The smell can arise due to:
- 🔹 Food residues in the drainage hole or on the seal.
- 🔹 Mold on walls (if the refrigerator has not been washed for a long time).
- 🔹 Using aggressive detergents (bleach, vinegar in high concentrations).
To eliminate odors, rinse the chambers with a soda solution (1 tablespoon per 1 liter of water), dry and place an odor absorber (for example, a bag of activated carbon).
How long does it take for a No Frost refrigerator to defrost?
Refrigerators with No Frost do not require regular defrosting, but they should still be defrosted 1-2 times a year for hygienic cleaning: Defrosting time:
- 🔹 1-2. hours at room temperature (if the ice does not have time to grow).
- 🔹 3-4 hours if ice has formed on the evaporator (for example, due to a malfunction of the defrosting heating element).
After defrosting, such a refrigerator reaches mode faster than drip models - usually in 1.5-3 hours.