The refrigerator does not switch between modes: complete instructions for troubleshooting

Have you noticed that your refrigerator works continuously, does not switch to rest, or, conversely, “freezes” in one mode? This problem occurs both in old models Atlant and Samsung, and in new ones LG with the system No Frost. In 80% of cases, the malfunction is associated with a breakdown of the thermostat, relay or electronic module - but sometimes external factors are to blame, which can be eliminated in 10 minutes without calling a technician.

In this article we will analyze all possible causeswhy the refrigerator does not switch between cooling and defrosting cycles, and also provide step-by-step instructions for diagnosis and repair. You will learn how to check the thermostat with a multimeter, what to do if the compressor is stuck, and when exactly it is time to call a specialist. At the end of the article - table of error codes for 10 popular brandswhich will help you quickly identify the problem by flashing indicators.

1. Signs of a malfunction: how to understand that the refrigerator is “stuck” in one mode

The first signal of a problem is continuous operation of the compressor more than 1-2 hours without pauses. In normal mode, the motor should turn off for 10–20 minutes every 30–60 minutes of operation (depending on the model and room temperature). Other symptoms:

• 🔴 The freezer freezes products (an ice crust forms), and in the main compartment it is too cold (milk freezes).
• 🔵 The refrigerator does not cool, but the motor hums without stopping (a leak is possible freon or clogged capillary tube).
• 🟡 Indicators light up abnormally: for example, on Indesit the red light flashes ALARM, and on Bosch there is an error E01.
• ⚪ The case is very hot on the side or back (the norm for a capacitor is warm, but not hot!).

If you observe at least one of these signs, first rule out external reasons:

Make sure that the door is tightly closed (there is no distortion of the seal)|Move the refrigerator from the wall 5–10 cm for ventilation|Check the voltage in the socket (should be 220–230 V)|Clean the back grill from dust and cobwebs|Remove products that block air circulation (for example, in No Frost)

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If after these steps the problem remains, proceed to diagnosing the internal components.

⚠️ Attention: In refrigerators with inverter compressor (for example, Samsung RB30A3200SA or LG GA-B409SLGL) the motor runs almost continuously, but with variable power. This is normal only a complete lack of cooling or constant operation at maximum power. (loud noise).

2. TOP 7 reasons why the refrigerator does not switch between modes

Let's look at it all possible malfunctions —from the simplest to the most critical. Start checking with. point 1 and move along the list until you find your problem.

Continuation of the table with reasons 6–7 and detailed instructions for elimination are in the following sections.

3. How to check a refrigerator thermostat with a multimeter (step-by-step instructions)

Thermostat (or thermostat) is the “brain” of the refrigerator, which sends a signal to the compressor to turn on/off. If it breaks, the motor will run continuously or will not start at all. You can check the thermostat without dismantling it - a multimeter is enough.

Instructions for mechanical models (Atlant, Biryusa, Stinol):

1. Unplug the refrigerator and remove all products.
2. Remove temperature control knob (usually it is attached to a latch or screw).
3. Under the handle you will see thermostat terminal block with 2-4 wires. Carefully remove them, remembering the location (take a photo!).
4. Switch the multimeter to resistance testing mode (200 Ohm) and connect the probes to the thermostat contacts:
   • 🔌 If at room temperature the resistance = 0 (short circuit) - the thermostat is working.
   • 🔌 If the resistance = ∞ (break) - the thermostat is broken, requires replacement.

How to check the thermostat in electronic refrigerators?

In models with electronic control (Samsung, LG, Bosch), the thermostat is replaced with temperature sensor (thermistor). To check it:

1. Find the sensor (usually it is located on the evaporator or in the freezer, it looks like a small plastic “tablet” with wires).

2. Disconnect the connector and measure the resistance:

- When +20°C: ~5–10 kOhm.

- At 0°C: ~27–33 kOhm.

3. If the values are very different or the resistance does not change when the sensor is cooled (for example, with ice), it is faulty.

The cost of a new thermostat is from 500 to 2,000 rubles (depending on the model). Replacement takes 15–30 minutes. The main thing is buy one with similar characteristics (the part number is indicated on the body of the old thermostat).

⚠️ Attention: In refrigerators No Frost often install double thermostats (separately for the refrigerator and freezer compartments). If only one is faulty, the second may continue to work, masking the problem. Check both!

4. relay: how to diagnose jamming and replace the part

Start relay - this is a small box attached to the compressor. It is responsible for starting the motor and protecting it from overheating. If the relay is jammed, the compressor will:

• 🔊 To buzz, but not start (relay clicks are heard).
• 🔥 Work in jerks with pauses of 5-10 seconds.
• 💨 Get very hot (you can burn when touched).

You can check the relay without special tools:

1. Disconnect the refrigerator from the mains.
2. Remove the relay from the compressor (usually it is secured with latches or one screw).
3. Shake the part - if is audible knocking or rattling, this is a sign of mechanical wear.
4. Smell the relay - smell burning indicates burnt contacts.

If the relay is faulty, it must be replaced. The price of a new part is from 300 to 1,500 rubles. When purchasing, pay attention to:

• 🔧 Compressor model (written on its body, for example, Embraco EGX 90H).
• 🔌 Relay type: RTK-1, RTP-1, DANFOSS 103N0010 etc.
• 📏 Dimensions and location of terminals (must match the old relay).

5. Electronic control module: resets, firmware and when replacement is needed

In modern refrigerators (Samsung, LG, Liebert) for switching modes responds electronic control unit (ECU). Its failures are manifested as follows:

• 📱 The display shows error codes (Er RS, F02, E04 etc.).
• 🔄 The refrigerator spontaneously turns on/off without a command.
• ❄️ Modes Super Freeze or Vacation not are turned off.

Before changing the module (and this is expensive - from 3,000 to 10,000 rubles), try reset the settings:

Disconnect the refrigerator from the network for 10-15 minutes|Press and hold the button Power Cool + Fridge (for Samsung)|For LG: press Ice Plus and Door Alarm simultaneously for 5 seconds|After resetting, adjust the temperature again

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If the reset did not help, perhaps required module firmware. You can do this yourself if you have:

• 💻 Laptop with firmware program (for example, Samsung Smart Service or LG ThinQ).
• 🔌 Cable USB-to-TTL (for connecting to board).
• 📄 Firmware file for your model (look on the forums or the manufacturer's website).

The firmware process takes 20–40 minutes. Important! If the power is turned off during the process, the module may fail permanently.

⚠️ Attention: In refrigerators Bosch and Siemens with a system VitaFresh resetting the settings disables the function dynamic coolingAfter resetting it, you need to re-enable it. menu Settings → Cooling → VitaFresh.

6. Freon leak and capillary tube clogged: how to recognize and what to do

If the refrigerator works without stopping, but does not cool, there are two possible problems:

1. Freon leak (refrigerant) - usually occurs due to corrosion of tubes or mechanical damage.
2. Clogged capillary tube - clogs with dirt, oil or moisture, blocking circulation freon.

Signs of a freon leak:

• ❄️ The freezer is slightly frosty, but the refrigerator compartment is warm.
• 🔧 The compressor is hot, but the condenser (grid at the back) is cold.
• 💨 At the leak site there may be oily spot (freon mixed with oil).

Signs of a clogged capillary tube:

• 🧊 The condenser is hot only at the beginning, then it cools down.
• 🔊 The compressor works with increased load (louder than usual).
• 🕒 The refrigerator cools, but very slowly (for example, in 5–6 hours instead of 1–2).

These malfunctions cannot be eliminated independently require special equipment:

• 🛠 Vacuum pump to pump out the remaining freon.
• 🔧 Gauge station for charging new refrigerant.
• 🔥 Burner for soldering tubes (in case of leakage).

Cost of repairs at the service center:

• Refilling freon - from 2,500 to 5,000 rubles.
• Removing the blockage - from 3,000 to 6,000 rubles.
• Replacing the capillary tubes - from 5,000 rubles.

7. master: 5 cases when amateur activity is dangerous

Some breakdowns seem simple, but in fact require professional intervention. Immediately contact a service centerif:

• ⚡ The refrigerator is electrocuted or sparks when turned on (breakdown on case).
• 🔥 The compressor smokes or smells of burning (a short circuit is possible).
• 💧 From the refrigerator oil leaks (depressurization of the system).
• 🧲 The door does not close due to deformation of the body (straightening is required).
• 📉 After replacing parts, the problem remained (incorrect diagnosis).

Average cost of departure masters in Moscow and regions:

When choosing a service center, check:

• 📄 Availability licenses for repair of refrigeration equipment.
• ⭐ Rating on Yandex.Maps or Google Maps (not lower than 4.5).
• 🔧 Warranty for work (minimum 6 months).

⚠️ Attention: In 2026, many service centers refused to repair refrigerators older than 10 years (for example ZIL, Minsk, Orsk) due to a shortage of spare parts. Check this information before the technician leaves!

FAQ: Answers to frequently asked questions

🔹 The refrigerator does not switch to rest, but it freezes normally. What should I do?

Most likely. faulty refrigerator thermostat (in two-chamber models they are separate). Check it with a multimeter, as described in section 3. If the thermostat is working, the problem may be in clogged drainage system (in drip refrigerators) or malfunction fan (in No Frost).

🔹 After turning off the light, the refrigerator does not switch between modes. Is this a breakdown?

The settings of the electronic module have probably gone wrong. Try:

1. Disconnect the refrigerator from the network for 10 minutes.
2. Turn on and press the reset button (usually Reset or hold Power 5 seconds).
3. If that doesn’t help, flash the module or replace it (see section 5).

🔹 Refrigerator Indesit shows an error F04. What does this mean?

Error F04 in refrigerators Indesit and Ariston means faulty freezer temperature sensor. Try:

• Turn off the refrigerator for 15 minutes (sometimes resetting helps).
• Check the resistance of the sensor (should be ~5–10 kOhm at +20°C).
• If the sensor is faulty, replace it (cost ~800–1,500 ₽).

🔹 Is it possible to use a refrigerator if it does not switch, but freezes?

For a short time (1-2 days) you can, but this will lead to:

• ⚡ Increased energy consumption (up to 2-3 times).
• 🔥 Overheating of the compressor and the risk of its breakdown.
• ❄️ Ice formation in the freezer (if defrosting does not work).

It is better to fix the problem as quickly as possible.

🔹 How much does it cost to replace a compressor in a refrigerator?

The cost depends on the model:

• Regular compressor (for example, Embraco EG) - 4,000–7 000 ₽ + work 2,000–3,500 ₽.
• Inverter compressor (for example, in Samsung or LG) - 8,000–15,000 ₽ + work 3,000–5,000 ₽.

For refrigerators older than 7 years, replacing the compressor often impractical is cheaper to buy a new one.