The refrigerator has stopped freezing, but inside Are you only hearing relay clicks or complete silence? Most likely, the problem lies in the heart motor of the unit. Before calling a technician or taking the equipment to a service center, you can try to start it yourself. In 60% of cases, the malfunction is associated with temporary failures or minor breakdowns that can be repaired without special tools. compressor - cardiac motor of the unit. Before calling a technician or taking the equipment to a service center, you can try to start it yourself. In 60% of cases, the malfunction is associated with temporary failures or minor breakdowns that can be repaired without special tools.
This article will help you figure out why the refrigerator motor does not start, how to check its performance and what to do to restore operation. We will look at both starting methods (for example, through a relay) and diagnostics of electrical circuits. Important: all manipulations with electricity require compliance with safety precautions - more about this in the corresponding section. mechanical starting methods (for example, through a relay), and diagnostics of electrical circuits. Important: all manipulations with electricity require compliance with safety precautions - more about this in the corresponding section.
If your refrigerator is a model with inverter compressor (for example, LG Inverter Linear or Samsung Digital Inverter), the algorithm of actions will differ from the classic linear ones motors. For such cases, we have identified a separate block with nuances.
Signs of a compressor malfunction: when to sound the alarm
The first signal of problems with the motor is absence of characteristic hum when you turn on the refrigerator. Normally, the compressor should start with a short pause (1-2 seconds) after the relay clicks, and then work in cycles: 10-20 minutes of activity and 5-15 minutes of rest. If this does not happen, pay attention to the following symptoms:
- 🔊 Clicks without starting: the relay is activated, but the motor does not start working (typical for overheating or inter-turn short circuit of the windings).
- ⚡ The refrigerator does not turn on at all: no response to connection to the network, the indicators do not light up (there may be problems with the electronics or an open circuit).
- ❄️ Bad cooling: the motor runs, but the temperature in the chambers does not drop to the desired level (may indicate a freon leak or wear on the piston group).
- 🔥 Overheating of the compressor housing: if after 10 minutes of operation the motor is too hot (above 60°C), this is a sign of increased load or malfunction.
Separately, it is worth highlighting the situation when the refrigerator turns on, but is immediately turned off by. This is often associated with protective relaywhich opens the circuit when overloaded. The reason may be either a malfunction of the relay itself or problems with the compressor windings.
⚠️ Attention: If the refrigerator makes noise strong humbut does not start, immediately disconnect it from the network! This may be a sign piston jamming further operation in this mode will lead to winding damage.
Preparation for launch: safety precautions and tools
Before you begin diagnosing or starting the compressor, be sure to turn off the power to the refrigerator. Even if it is not working, there may still be voltage in the capacitors! For work you will need:
- 🔧 Phillips and flat head screwdriver (to remove the protective casing).
- 📊 Multimeter (to check the resistance of the windings and voltage).
- 🔌 Extension cord with grounding (if the socket is far from refrigerator).
- 🧤 Rubber gloves (for protection against accidental electric shock).
- 📝 Notepad and pen (to record instrument readings).
If you plan to check starting relay, also prepare contact tester or a 220V incandescent lamp with wires (to check operation). For electronically controlled refrigerators (for example Bosch KGE39XW2AR), you may need diagnostic cable to read errors.
⚠️ Attention: Do not use compressor windings voltage probes without insulation to check - they are not designed to work with high currents. The multimeter must support resistance measurement mode up to 2000 Ohm.
De-energize the refrigerator (unplug the plug from the socket)|
Release access to the compressor (remove the back cover)|
Check the integrity of the power cord and plug|
Prepare tools and a multimeter|
Read the connection diagram (available on the compressor sticker)-->
Diagnostics of the compressor: checking the windings and relays
The first step is testing the compressor windings. There are usually three terminals on the motor body, marked with letters:
C (common - common), S (start - starting winding), R (run - working winding). If there is no marking, focus on the location: C usually in the center.
Connect the multimeter in resistance measurement mode (Ω) and take measurements between the terminals:
| Conclusions | Normal resistance (Ohm) | What does deviation mean |
|---|---|---|
C-S |
20–40 | Short circuit or break in start winding |
C-R |
10–20 | Problems in working winding |
S-R |
30–50 | Sum of resistance C-S i C-R (must be equal to this value) |
If at least one of the parameters is very different from the norm (for example, C-S = 0 Ohm or ∞), this indicates turn-to-turn short circuit or a break. In this case, the compressor must be replaced.
Next check starting relay. It can be:
- Electromechanical (with a coil and core, for example, in refrigerators Atlant),
- Electronic (with a control board, like c Samsung RB30J3000EF).
To check a mechanical relay, connect it to the compressor and apply voltage through an incandescent lamp (220V). If the relay is working properly, the lamp will light up for 1-2 seconds at startup.
How to check an electronic relay without a circuit?
In most cases, electronic relays are not repairable, but they can be checked by replacing them with a known good one (for example, from another refrigerator of the same model). If after replacement the compressor starts, the problem is in the relay. Please note: electronic boards are often tied to a specific compressor model, so the “donor” must be identical.
Manual start of the compressor: step-by-step. instructions
If the diagnostics showed that the windings and relays are working, but the motor does not start, you can try forced startThis method is suitable for linear compressors (not inverter ones!) You will need a screwdriver with an insulated handle and a multimeter.
Disconnect the refrigerator from the network and remove the starting relay from the compressor (usually it is secured with latches or screws).
Connect a multimeter in voltmeter mode (
AC 220V) to the relay contacts that go to the compressor.Plug in the refrigerator. 1-2 seconds after the relay clicks, briefly close the compressor terminals with a screwdriver (no longer than 1 second!). If the motor starts, immediately remove the screwdriver. If not, try again after 5 minutes (let the windings cool).
CAndScompressor terminals with a screwdriver (no longer than 1 second!).If the engine starts, immediately remove the screwdriver. If not, try again after 5 minutes (let the windings cool).
Critical: do not keep the contacts closed for more than 1 second - this may burn out the starting winding! If the compressor starts but stops again after a few seconds, the problem may be insufficient freon pressure or dirty capillary pipeline.
Features of starting inverter compressors
Inverter motors (installed in models LG GA-B489YDQZ, Samsung RB37J5230SS etc.) are not started in the traditional way. They are controlled electronic unit, which smoothly regulates the speed. Signs of a malfunction of the inverter compressor:
- 📉 The refrigerator turns on, but immediately turns off with an error (for example,
Er IForE4on the display). - 🔄 The motor runs jerkily, without gaining full power.
- 🔇 Complete absence of sounds (even relay clicks).
To diagnose an inverter compressor:
Check inverter board on the presence of swollen capacitors or burnt tracks.
Measure the resistance between the compressor terminals (should be within
5–15 Ohmfor each winding).View error codes on the display (look for a decryption in the instructions for the model).
Independent repair of inverter compressors is difficult - it often requires re-flashing the board or replacing sensors. If the refrigerator is under warranty, it is better to contact a service center.
⚠️ Attention: In inverter refrigerators Samsung i LG if the compressor malfunctions, the control unit may block the start. Attempts to force it to turn on without diagnosing the board will lead to its failure.
Frequent causes of a non-working motor and solutions
If the compressor does not start, it is not always its fault. Let's look at typical causes and solutions:
| Cause | Symptoms | Solution |
|---|---|---|
| Faulty relay | Clicks without starting, the compressor works after manual switch on | Replace the relay (cost ~500–1500 ₽) |
| Winding break | The multimeter shows ∞ on any terminals |
Replacing the compressor (from 4000 ₽) |
| Freon leak | The motor runs, but does not cool, the condenser tubes are cold | Detection and elimination of leaks, refilling (~3000–6000 ₽) |
| Piston jamming | Humming at start-up, strong heating of the case | Replacement of the compressor (repair is impractical) |
| Faulty thermostat | The compressor does not turn on at all, the lamp is inside lights up | Replacing the thermostat (~800–2000 ₽) |
In refrigerators with a system No Frost (for example, Bosch KAN92VI20R) an additional reason may be faulty fan. If it is blocked by ice or burnt out, the compressor will shut down due to overheating.
When to call a technician: signs of serious breakdowns
Not all faults can be fixed on your own. Contact a specialist if:
- 🔧 The compressor starts, but after 5-10 seconds it turns off with loud clicking (possibly jamming or short circuit).
- ⚡ On the motor housing or relays are visible melted areas.
- 📟 An electronically controlled refrigerator shows
Er FF,E5or other errors associated with sensors. - 💨 You can feel it in the chambers burning smell (sign burnt winding).
The cost of diagnostics in service centers is usually 1000–1500 ₽, and repairs cost 2000–10 000 ₽ depending on the complexity. For refrigerators older than 10 years, replacing the compressor is often not economically feasible - it is cheaper to buy new equipment.
⚠️ Attention: If the refrigerator has been flooded or has been subjected to severe power surges, do not try to turn it on! In such cases, a complete diagnosis of the electronics is required, since the risk of a short circuit is high.
FAQ: answers to frequently asked questions
Is it possible to start a compressor without a relay?
Technically yes, but it is dangerous. The relay protects the windings from overheating. For a short-term test, you can apply voltage directly to C i S, but not longer than 2-3 seconds. Long-term operation without a relay will lead to motor combustion.
Why does the compressor hum but does not start?
This is a typical symptom turn-to-turn short circuit or piston jamming. Also check the network voltage - if it is low (180V), the compressor will not be able to start. Use a voltage stabilizer.
How much does a new compressor for a refrigerator cost?
The price depends on the model and type of motor:
- Linear compressor: 4000–8000 ₽ (for example, for Atlant or Stinol).
- Inverter compressor: 10 000–20 000 ₽ (for LG or Samsung).
- Installation will cost $ 2000–5000 ₽.
How to check if the compressor is working if it does not start?
Turn off the refrigerator, remove the relay and test the windings with a multimeter (see table resistances are higher). If the readings are normal, but the motor does not start, the problem may be in starting capacitor or the control unit.
What to do if the compressor gets very hot after starting?
Normal case temperature - to 60°C. If higher, check:
- Ventilation (if the compressor is blocked by foreign objects).
- Pressure freon (if there is a leak, the motor wears out).
- Network voltage (when 240V+ the compressor overheats).
If the problem persists, an oil or compressor change is required.