Why the lower chamber of the refrigerator does not freeze: a complete analysis of the reasons and solutions

Have you opened the freezer, and instead of the usual cold - room temperature, melted food and puddles on the shelves? The problem when The refrigerator does not freeze the lower chamberoccurs more often than it seems. In 60% of cases, the culprit is not a serious breakdown, but a simple settings failure or system blockage. But how to distinguish a temporary glitch from a critical malfunction that requires calling a technician?

In this article we will analyze all possible reasons - from trivial (not tightly closed door) to complex (failure of the electronic module). You will learn how to independently diagnose the problem using a multimeter or even an ordinary hair dryer, what manipulations can be done without the risk of aggravating the situation, and in what cases immediately disconnect the refrigerator from the network to avoid a fire. We will pay special attention to models with the system No Frost —their “weak points” are fundamentally different from classic units.

Save on calling a technician: follow our step-by-step instructions with photos and videos (links to YouTube tutorials are provided in the relevant sections). And if repairs are unavoidable, we will tell you how much spare parts and labor will cost in 2026, so that you are not deceived at the service center.

1. Checking the obvious: 5 simple reasons that 90% of users miss

Before disassembling the refrigerator or calling service, eliminate the “human factor”. These problems do not require repair, but they are to blame in half of the cases when the freezer stops working:

• 🔌 Lack of power. Check if the indicator on the panel is lit. Perhaps the circuit breaker in the control panel has tripped or the plug has come off the socket (especially important for models Samsung RB37J5240SA with sensitive electronics).
• ❄️ Vacation or Eco mode. In some refrigerators (for example LG GA-B489YQZL), these functions turn off the freezer to save energy. Look at the instructions - the path to the menu may differ.
• 🚪 Door is not tightly closed. Even a gap of 2 mm leads to freezing of the seal and failure of the sensors. Carry out a test with a sheet of paper: if it falls out when the door is closed, the seal requires replacement.
• 🌡️ Incorrect temperature settings. In two-compressor models (Bosch KGE39XW2AR), the freezer and refrigerator compartment are regulated separately. Make sure that the thermostat is not set to “0” or “Minimum”.
• 🧊 Overload with food. If you fill the freezer to capacity, air circulation is disrupted. In refrigerators No Frost (for example, Indesit ITF 118 W) this leads to icing of the fan and the system stops.

Simple test: unplug the refrigerator for 10 minutes, then turn it on again. If after 2-3 hours the freezer began to cool, the problem was a temporary failure of the control board. If not, read on.

⚠️ Attention: In refrigerators with inverter compressor (Samsung RB34T602CSR, LG GB-B459SLQZ) after a reboot, protection may work. Wait 5-7 minutes before turning it on again, otherwise you risk burning the motor.

2. A clogged capillary tube: how to diagnose and fix it without a technician

The capillary tube is the “aorta” of the refrigerator: freon circulates through it between the compressor and the evaporator. If it becomes clogged (for example, due to oil decomposition or moisture ingress), the freezer stops freezingand the refrigerator compartment can continue to operate. Signs of a blockage:

• 🔊 The compressor runs non-stop, but does not turn off.
• ❄️ The condenser (grid at the back) is cold, although it should heat up.
• 🕒 The temperature in the freezer rises to +5...+10°C in 6–12 hours.

For diagnostics:

1. Disconnect the refrigerator and move it away from the wall.
2. Find the capillary tube (thin copper tube running from the compressor to evaporator).
3. Gently touch it with your hand: if one part is hot and the other is icy it is 100% clogged.

Solution:

1. Blow out the tube with a compressed with air (use a compressor for tires with a pressure of no more than 6 atm).
2. If this does not help, you will need replacement capillary or flushing the system freon R134a (for models before 2010) or R600a (for modern ones).

⚠️ Attention: Never use metal objects for cleaning (wire, nails) - they will damage the inner coating of the tube, and the blockage will recur in 1-2 months.

3. Failure of the thermostat or temperature sensor: how to check

The thermostat (in mechanical models) or temperature sensor (in electronic models) is the “brain” that tells the compressor when to turn on. If it breaks the compressor either does not start, or runs idle. How to check:

To replace the thermostat in mechanical models (Atlant MXM 1705-80, Biryusa 145):

1. Remove the temperature control knob (pry it with a screwdriver).
2. Unscrew the protective panel inside the chamber.
3. Disconnect the wires from the thermostat (take a photo of the connection diagram!).
4. Install a new thermostat (cost: 800–1500 rubles for most brands).

In electronic refrigerators (Samsung RL38T671CS8, LG GA-B429SLGL), the sensor is usually located on the evaporator. You will have to remove it for access. the inside panel of the freezer is more complicated, and without experience it is better not to take risks.

4. Problems with the compressor: when you can’t do without a technician

The compressor is the heart of the refrigerator. If it is broken, the freezer won't work, and the refrigerator compartment (in single-compressor models) will also start to heat up:

• 🔇 The compressor does not turn on at all (no hum, vibration).
• 🔥 The compressor body is hot (more than +80°C).
• 💥 The protection is activated 5–10 seconds after start (click and shutdown).
• 🛢️ Oil leaks are visible on the compressor housing (freon leakage).

Self-diagnosis:

1. Turn off the refrigerator and wait until the compressor cools down (1-2 hours).
2. Remove the protective casing from the back wall.
3. Test the compressor windings with a multimeter:
   • Resistance between terminals C (common) and S (starting): 20–40 Ohm.
   • Resistance between C and R (working): 10–20 Ohm.
   • Between S and R there should be a total resistance (30–60 Ohms).

If at least one value is “0” or “∞”, the winding is burned out.

In 30% of cases the compressor does not work due to breakdown of the starting relay (cost: 500–1200 rub.). You can replace it yourself, but you will need a specialist to repair the motor. Average prices for work in 2026:

• 🔧 Replacement of the compressor: 4000–7000 rubles. (without the cost of the part).
• 🔄 Refilling with freon: 2500–4000 rubles.
• 🔥 Repair of windings: 3000–5000 rubles. (not always advisable).

⚠️ Attention: In refrigerators with inverter compressor (Panasonic NR-BN30A1, Hitachi R-BG410P6) you cannot use conventional starting relays! They require specialized parts that are selected according to the model.

What to do if the compressor hums but does not start?

This is a sign interturn short circuit or piston wedge. Do not try to turn on the refrigerator again - this may cause the windings to catch fire. Immediately disconnect it from the network and call a specialist.

5. Freon leak: how to detect and what to do

Freon is a refrigerant that circulates through the system and cools the chambers. If it leaks (for example, due to corrosion of tubes or mechanical damage), the freezer stops freezingand the compressor is idling. Signs of a leak:

• ❄️ The condenser (grid at the back) remains cold even after an hour of operation.
• 🔊 The compressor works without stopping, but the temperature does not drop.
• 💨 An oily stain is visible at the leak site (usually on the bends of the tubes).
• 🛠️ On some models (Liebherr CNef 4315) an error light comes up F5 or AL02.

How to find leak:

1. Unplug the refrigerator and inspect the pipes for corrosion or cracks.
2. Apply soap solution to suspicious areas - if there is a leak, bubbles will appear.
3. Use Freon leak detector (can be rented for 500–800 rub./day).

Solution:

• 🔧 Small leak (for example, at the soldering point): you can solder it yourself using a torch and solder (tin + flux for copper).
• 🚫 Corrosion of pipes: a section of the system will need to be replaced. The service will cost 3000–6000 rubles.
• 🔄 After eliminating the leak be sure to refill freon (cost: 1500–3000 rubles depending on the type of refrigerant).

In refrigerators No Frost leaks often occur in evaporator (hidden behind the panel). To get to it, you will have to defrost the unit and remove the internal lining of the freezer.

6. Failure of the No Frost system: why the fan freezes

In refrigerators with the system No Frost (Samsung RL34ECBP, Indesit ITF 118 W) the fan is responsible for cooling, which drives cold air through the chambers. If it freezes or breaks, the freezer stops freezingand the refrigerator compartment can continue to work. Reasons:

• ❄️ Icing of the evaporator due to a faulty defrost sensor or Heating element.
• 🔌 Failure of the fan motor (often in models LG GA-B489YQZL after 5–7 years of operation).
• 🧊 Clogging drainage holeleading to the accumulation of condensate.

How to diagnose:

1. Unplug the refrigerator and defrost it for 12-24 hours.
2. Remove the back panel in the freezer (usually secured with 4-6 screws).
3. Check whether the fan rotates manually. If not, the motor is burned out.
4. Inspect the evaporator: if it is covered with ice, the problem is in the defrosting system.

Solution:

• 🔧 Fan replacement: the part costs 1500–3000 rubles, the work costs 2000–3500 rubles.
• 🔥 Replacing the defrosting heating element: 1000–2500 rub. (depending on the model).
• 🧹 Cleaning the drainage: you can do it yourself using wire and warm water.

In refrigerators Full No Frost (for example Liebherr CN 4015) there is one fan for both cameras. If it breaks, the refrigerator compartment will also stop working.

7. Electronic control module: when the refrigerator is “glitchy”

In modern refrigerators (Samsung RL60T671CS8, LG GB-B539SLQZ), an electronic board is responsible for all processes. If it fails, the symptoms can be very different:

• 📛 Errors appear on the display E3, F7, AL04 (see the instructions for decoding).
• 🔄 The compressor turns on for 5-10 seconds and turns off.
• 🌡️ The temperature in the freezer jumps from -20°C to +10°C for no reason.
• 🔌 The refrigerator does not respond to button presses.

Causes of board failure:

• ⚡ Power surge in the network (especially important for houses with old wiring).
• 💦 Ingress of moisture (for example, during defrosting).
• 🕰️ Natural wear and tear (board service life: 7–10 years).

Independent repair is only possible if:

• 🔧 The fuse on the board has blown (can be replaced with a soldering iron).
• 🧹 The contacts have oxidized (wipe with alcohol).
• 🔄 The firmware has been lost (on some models Samsung it can be restored via service menu).

In other cases, the board will need to be replaced (cost: 5,000–12,000 rubles, depending on the model). For refrigerators Bosch and Siemens sometimes it helps resetting the settings:

1. Unplug the refrigerator for 1 minute.
2. Turn on and immediately press the combination:
- For Bosch KGN39XL30R: "Freezer" + "SuperCool" (hold 5 seconds).
- For Siemens KG39NXI35R: «Frigo» + «Freezer» (hold 10 sec).
3. Wait for the beep and reboot.

⚠️ Attention: If the control board has failed due to a power surge, check stabilizer or surge filter. Without them, modern electronically controlled refrigerators will last no more than 3–5 years.

FAQ: Frequently asked questions about a non-working freezer

The freezer is not freezing, but the refrigerator compartment is working. What's the matter?

In 90% of cases, this indicates:

• Leakage of freon in the freezer circuit (if the refrigerator double-circuit).
• Failure clogged switching valve (in single-compressor models).
• Failure freezer temperature sensor.

In refrigerators No Frost also check the fan - if it is frozen, the cold stops flowing into freezer compartment.

The refrigerator hums, but does not freeze. What to check?

Most likely, the problem is in one of three components:

1. The compressor is working. idle (no refrigerant or clogged capillary).
2. The starting relay is broken —the compressor tries to start, but cannot.
3. The thermostat is faulty —it does not give a signal for cooling.

The first thing to do is to touch the condenser (the grill at the back). If it is cold, there is a freon leak or a blockage. If it is hot, there is a problem with the compressor or relay.

After defrosting, the freezer does not freeze. Why?

Probable reasons:

• 💧 Water got on electronic module or temperature sensor.
• ❄️ Frosted fan (in models No Frost).
• 🔌 The contacts came loose after assembly (check the wires on the compressor and thermostat).
• 🧊 Clogged drainage hole, due to which condensation accumulates in the freezer.

Solution: defrost the refrigerator again for 12-24 hours, then dry the internals with a hairdryer (at minimum temperature!) panel.

Is it possible to refill freon yourself?

Theoretically yes, but in practice it is dangerous and impractical:

• 🛠️ You will need vacuum pump, gauge manifold i freon cylinder (equipment rental will cost 2000–3000 rubles).
• ⚠️ Risk freon poisoning (in case of a leak in the room).
• 🔧 Without experience, it is easy to refill the system, which will lead to compressor failure.

It is more profitable to call a specialist: refilling freon at a service center costs 2500–4000 rubles, but you will receive a guarantee for the work.

How much does it cost to repair a freezer at the service?

Average prices in 2026 (Moscow and regions):

Type of breakdown	Cost (rub.)
Replacement of thermostat	1500–2500
Repair of compressor	4000–7000
Repairing leaks + refilling freon	3500–6000
Replacement of control board	5000–12000
Cleaning the No Frost system	2000–4000

Prices depend on the refrigerator model and region. For the exact amount, call a technician for diagnostics (usually free of charge for further repairs).