You turned on the refrigerator, it hummed, the light inside came on, but after an hour the food is still warm? The situation when the refrigerator turns on, but does not freezeoccurs often - and the reasons can be either simple (incorrect configuration) or serious (failure of key components). In this article we will analyze all possible scenarios: from a banal thermostat failure to a refrigerant leak, and also tell you how to diagnose the problem yourself and when you can’t do without a technician.
It is important to understand: if the refrigerator hums, but does not cool, this is a signal of a malfunction in the cooling system. In some cases (for example, when the capillary tube is clogged), cleaning is sufficient, in others (compressor failure) the part will need to be replaced. We have compiled a checklist of 12 reasonsso that you can quickly navigate and not waste time on unnecessary actions.
Before starting repairs, check the obvious: whether the door is closed or overloaded whether the refrigerator contains food, or whether it is positioned close to the wall (this disrupts heat exchange). If everything is in order, read on.
1. Malfunction of the thermostat (thermostat)
The thermostat is the “brain” of the refrigerator that controls the temperature. If it fails, the compressor may work continuously or, conversely, not turn on at all. Signs of a thermostat failure:
- 🔊 The compressor hums non-stop, but there is no cold.
- ❄️ There is light frost in the freezer, but the food does not freeze.
- 🔄 The refrigerator turns off spontaneously and turns on.
How to check? Unplug the refrigerator, take out the thermostat (usually it is located next to the temperature control knob) and check it with a multimeter. If the resistance does not change when you turn the knob, the part is faulty. Replacing the thermostat will cost 1,500–3,000 rubles (depending on the model).
Temporary solution: if the refrigerator is No Frost, you can try resetting the settings by unplugging the plug for 10-15 minutes. Sometimes this helps with software failures.
2. Freon leak: how to recognize and what to do
Freon is a refrigerant that circulates through the system and provides cooling. If a crack appears somewhere (most often in the door heating circuit or evaporator), gas escapes and the refrigerator stops freezing. Signs of a leak:
- 🕳️ The compressor works, but does not turn off (trying to “catch up” the cold).
- 🧊 There is no condensation on the back wall of the refrigerator (in models with a drip system).
- 🔧 Oil stains are visible on the floor under the refrigerator (freon comes out along with oil).
Fix the leak yourself impossible - special equipment is required for soldering and refilling freon. Repair cost: from 3,000 to 8,000 rubles, depending on the location of the leak and the type of refrigerant.
⚠️ Attention: Freon has no odor, but its leakage is hazardous to health at high concentrations. If you suspect a breakdown of the circuit, ventilate the room and do not turn on the refrigerator until repairs.
In models with No Frost leakage often occurs in the evaporator (it is hidden behind the back panel of the freezer). To confirm the diagnosis, the technician uses a leak detector or soap solution.
3. Compressor failure: symptoms and solutions
The compressor is the “heart” of the refrigerator. If it breaks, the refrigerator may hum but not cool. Signs of malfunction:
- 🔇 The compressor turns on for 1-2 seconds and turns off (protection is triggered).
- 🔥 The compressor housing gets very hot (hotter than usual).
- 🛠️ The refrigerator does not freeze in any of the departments.
Causes of compressor failure:
- Natural wear and tear (service life - 10–15 years).
- Overheating due to poor ventilation (the refrigerator is close to the wall).
- Power surges (if not stabilizer).
How to check? Turn off the refrigerator, touch the compressor (it is located at the bottom of the back). If it scalding hot - most likely the winding has burned out. Replacing the compressor will cost 5,000–12,000 rubles (plus refilling freon).
| Symptom | Probable cause | Repair cost (RUB) |
|---|---|---|
| The compressor hums, but does not cool | Leakage freon or the system is clogged | 3 000–8 000 |
| The compressor turns on and immediately turns off | The start-up relay is faulty | 1 500–3 000 |
| The compressor does not turn on at all | The compressor or thermostat is burnt out | 5 000–12 000 |
| The refrigerator freezes poorly, the compressor runs non-stop | Clogged capillary tube | 2 500–5 000 |
4. Capillary tube clogged: how to clean the system
The capillary tube is a thin channel through which freon enters the evaporator. Over time, it can become clogged due to moisture, oil, or small particles. Symptoms:
- ⏳ The refrigerator takes a long time to gain cold (several hours).
- 🧊 The freezer works, but the refrigerator compartment does not (or vice versa).
- 🔊 The compressor works without stopping, but the noise is quieter than usual.
How to fix it? Cleaning the capillary tube requires complete disassembly of the system the use of a hydraulic press. Repair cost: 2,500–5,000 rubles. In some cases, the technician may suggest replacing the entire tube.
⚠️ Attention: Do not try to clean the tube yourself - this may lead to its rupture and freon leakage. Entrust the work to a professional.
In models No Frost clogging often occurs due to ice getting into the system. If you notice that the refrigerator has become less freezing after defrosting, perhaps moisture has entered the capillary tube.
5. Malfunction of the start-up protection relay
The start-up protection relay is responsible for starting the compressor. If it breaks, the compressor may:
- 🔇 Not turn on at all.
- 🔄 Turn on for a few seconds and turn off.
- 🔥 Overheat and trigger thermal protection.
How to check? Remove the relay (it is attached to the compressor) and inspect it for melted contacts or a burning smell. If visually everything is normal, check the coil resistance with a multimeter. Replacing the relay will cost 1,500–3,000 rubles.
In some models Indesit i Ariston the relay is built into the compressor - in this case, the entire unit will need to be replaced.
Disconnect the refrigerator from the network
Remove the relay from the compressor
Inspect for melting
Ring with a multimeter (coil resistance should be 20–40 Ohms)
Install a new one relay (if the old one is faulty)-->
6. Problems with the fan in No Frost systems
In refrigerators with the system No Frost the fan is responsible for air circulation. If it breaks, the cold will stop flowing into the refrigerator compartment (the freezer can still work). Signs:
- 🌀 The refrigerator compartment is warm, the freezer is normal.
- 🔇 There is no characteristic fan noise (normally it turns on periodically).
- 🧊 There is a thick layer of ice on the back wall of the freezer (fan iced up).
How to fix?
- Defrost the refrigerator for 12-24 hours (if the problem is icing).
- Check whether the fan is blocked by ice or foreign objects.
- If the fan does not spin, replace it (cost: 2,000–4,000 rubles).
In models Samsung i LG the fan often fails due to ice. Regular defrosting (every 6 months) will help avoid this problem.
What happens if you don't fix the fan?
Without air circulation, the refrigerator compartment will stop cooling, and the compressor will wear out, which will lead to its breakdown. In addition, ice will begin to build up in the freezer, which can damage the defrost heating element.
7. Malfunction of the control board
In modern refrigerators, an electronic board is responsible for the operation of all systems. If it fails, the refrigerator may:
- 📛 Not respond to temperature settings.
- 🔄 Turn on and off spontaneously.
- 🚨 Issue errors on the display (for example
E1,F2in models Bosch).
Causes of board failure:
- ⚡ Voltage surges (if there is no stabilizer).
- 💧 Moisture ingress (for example, during defrosting).
- 🕰️ Natural wear and tear (especially in refrigerators older than 10 years).
Repairing the board will cost up to 3,000–7,000 rubles, replacement - up to 15,000 rubles. In some cases, the technician can reflash the board if the failure is software.
⚠️ Attention: If the refrigerator is under warranty, do not open the board yourself - this will void the warranty.
8. reasons
If none of the above problems apply, check:
- 🔌 Line voltage: if it is below 200V, the compressor will not work at full capacity. Use a stabilizer.
- 🚪 Door seal: if it is torn or deformed, warm air penetrates inside and the refrigerator cannot gain temperature. Replacing the seal costs 1,000–2,500 rubles.
- 🧊 Freezing of the drainage hole: in models with a drip system, water may freeze and block the outflow of condensate. Clean the hole with cotton wool. with a stick.
- 🔧 Incorrect installation: if the refrigerator is uneven or close to the wall, this interferes with heat transfer. Move it 5–10 cm from the wall.
In refrigerators. c two compressors (for example, Liebherr) only one of them can break. In this case, either the refrigerator or the freezer will not freeze.
FAQ: Frequently asked questions
The refrigerator hums, but does not freeze - what to do first?
Disconnect the refrigerator from the mains. 15-20 minutes, then turn it on again. If the problem persists, check:
- Is the door closed (maybe the seal or food is in the way).
- Is the fan working (in models No Frost).
- Is there ice on the back wall (if there is, defrost the refrigerator).
If this does not help, call a specialist.
How much does it cost to repair if the refrigerator does not freeze?
The cost depends on the reason:
- Replacing the thermostat: 1,500–3,000 rub.
- Elimination of freon leak: 3,000–8,000 rub.
- Replacement of the compressor: 5,000–12,000 rub.
- Cleaning the capillary tube: 2,500–5,000 rubles.
The technician will tell you the exact price after diagnosis.
Is it possible to refill freon yourself?
No. To refill freon you need:
- Special equipment (vacuum pump, pressure gauges).
- Knowledge of the exact type of refrigerant (for example, R-134a or R-600a).
- Experience in soldering copper pipes.
Incorrect charging can lead to compressor failure.
Why does the refrigerator not freeze after defrosting?
Possible reasons:
- Moisture has entered the system (you need to dry the refrigerator for 12-24 hours).
- The starting protection relay burned out (due to a power surge when turned on).
- The drainage hole is frozen (clean it).
How to extend the life of the refrigerator?
Follow simple rules:
- Defreeze refrigerator No Frost once every 6 months, drip - once every 1-2 months.
- Do not put hot foods in the chamber.
- Use a voltage stabilizer.
- Check the door seal for wear.