Compressor failure is one of the most unpleasant situations for the owner of a refrigerator Stinol, since this particular unit is the “heart” of the entire cooling system. When the equipment stops freezing and it’s warm inside the chamber, the first thing the technician thinks about is diagnosing the motor. However, do not rush to draw conclusions about a fatal breakdown until you have thoroughly checked the electrical circuit and mechanical part of the unit.
Owners often confuse the failure of the engine itself with a malfunction of the start relay or thermostat, which leads to unnecessary expenses on the purchase of an expensive new compressor. Correct diagnostics allows you to accurately determine whether the device is worth repairing or whether it is easier to replace it entirely. In this article, we will analyze a step-by-step algorithm of actions that will help you identify the true reason for the silence of the refrigerator.
To get started, you will need a minimum set of tools: a multimeter, pliers and, possibly, electrical tape. It is important to understand that any work with electrical appliances requires compliance with safety precautions. Before touching the inside of the refrigerator, be sure to unplug the appliance by removing the plug from the outlet. This rule cannot be ignored, since the risk of electric shock when working with capacitors and windings is real.
Primary visual diagnostics and condition assessment
Before taking up measuring instruments, it is necessary to conduct an external inspection of the back of the refrigerator Stinol. Often the nature of the damage is visible to the naked eye. If you notice blackening of the paint on the compressor housing, swelling or traces of oily smudges in the lower part, this may indicate an insulation breakdown or depressurization of the system. Also pay attention to the integrity of the wires going to the terminal box.
Pay special attention to the temperature conditions of the motor. If, after trying to turn on, the compressor heats up to very high temperatures in a matter of minutes, and the refrigerator does not cool, this is a sure sign of jamming of the piston group or an interturn short circuit. In normal condition, the unit should be warm, but not scalding.
⚠️ Attention: If you find traces of oil or a burning smell on the compressor tubes, further independent operation is prohibited. This may indicate a freon leak, which requires professional soldering and refrigerant charging.
Sometimes the problem lies not in the motor itself, but in vibration. Make sure the refrigerator is level and the shipping bolts (if any) have been removed. Excessive shaking can lead to false triggering of protective mechanisms.
Checking the starting relay and thermal protection
Before “ringing” the motor windings, it is necessary to rule out a malfunction of the starting relay. It is this small element that often causes the compressor to hum but not start, or to click and immediately turn off. In refrigerators Stinol relays of the RT (posistor) or RZ (induction) type are most often used. Remove the plastic casing from the side of the compressor to gain access to the connector.
Carefully disconnect the block with wires from the compressor. Inside you will see a start relay and, often combined with it or separate, thermal protection. A posistor relay can be checked by simply shaking it near the ear: if the ringing of scattered ceramic elements is heard inside, the part requires replacement. The induction relay is checked for integrity of contacts and absence of carbon deposits.
Thermal protection (thermal relay) also plays a critical role. It opens the circuit when the windings overheat. Check it with a multimeter in continuity mode: the contacts should close, emitting a characteristic squeak. If the device is silent, it means the circuit is broken and the motor is not receiving power. Replacing this part is inexpensive and often solves the problem of a “silent” refrigerator.
☑️ Diagnostics of the starting unit
Instrumental check of the windings with a multimeter
The most reliable way to determine the condition motor - measurement of winding resistance. To do this, you will need a multimeter switched to resistance measurement mode (Ohms). On the case of most compressors Stinol there is a connection diagram, but the standard arrangement of contacts is as follows: the top two contacts are the starting and operating windings, and the bottom (or side) is the common terminal.
The measurement process requires care. Apply one multimeter probe to the common contact, and the second one alternately to the terminals of the starting and working windings. Normal resistance values for a working motor vary within certain limits. The working winding usually has lower resistance (from 10 to 30 Ohms), since it is wound with thicker wire. The starting winding has a high resistance (from 20 to 50 Ohms and higher).
If the multimeter shows one (infinity) in any section, this means a winding break. In this case, it is impossible to restore the engine at home - the compressor must be replaced. If the device shows zero or a value close to zero, this indicates a short circuit of the turns. This situation is dangerous because, when turned on, it will knock out the circuit breakers in the electrical panel.
⚠️ Attention: Never try to “revive” a compressor with signs of an interturn short circuit by directly connecting to the network bypassing the relay. This is guaranteed to lead to the final combustion of the engine and possible fire of the wiring.
An important parameter is also the resistance between the compressor housing and the contacts. Set the multimeter to maximum resistance mode (Megaohms). Press one probe against the unpainted part of the body (clean a small area for contact with a knife), and the second one alternately against the contacts. The device should show infinity. Any resistance value indicates a breakdown of the insulation on the housing, which makes operation of the device deadly.
Table of normal resistance indicators
For the convenience of comparing the results obtained, use the table below. The values may differ slightly depending on the specific model of the compressor installed in your Stinol (for example, model Aspera, Danfoss or Secop).
| Measurement type | Normal range (Ohm) | Fault symptom | Action |
|---|---|---|---|
| Working winding | 10 – 35 Ohm | Infinity (break) | Replacement of the compressor |
| Start winding | 20 - 60 Ohm | 0 Ohm (short circuit) | Replacing the compressor |
| Case - contact | Infinity | Any value | Breakdown to the case, dangerous! |
| Thermal protection | 0 Ohm (closed) | Infinity | Replacement of protection |
It is worth noting that the resistance of the windings may vary slightly depending on the temperature of the engine Cold compressor. will have slightly lower readings than a hot one. However, these fluctuations should not be dramatic. If you see a sharp deviation from the tabular data, most likely the unit requires replacement.
In some cases, especially on older models, the contacts may be oxidized. Before taking measurements, try to carefully clean the terminals with fine sandpaper. Sometimes this allows you to get correct readings and even restore the contact if the problem was oxidation and not. a wire break inside the coil.
Why is the resistance of the starting winding higher?
The starting winding is wound with a thinner wire and has more turns to create the necessary magnetic phase shift to start the rotor. The working winding must conduct more current during operation, so its resistance is lower.
Mechanical diagnostics: jamming and pressure
The electrical serviceability of the compressor does not guarantee its normal operation. The mechanical part is also subject to wear. If the electrical parameters are normal, but the engine hums and does not start (or starts for a split second and stalls), there is a high probability of the piston group being jammed. This often happens after a long period of equipment downtime or due to oil burnout.
There is a “wedging” method, which sometimes helps to revive the unit, but it requires caution. The essence of the method is to apply voltage to the starting winding, bypassing the standard relay to create a powerful starting impulse. However, this method is risky and can completely kill the compressor if the jamming is severe.
A safer, but more labor-intensive way to check is to measure the outlet pressure. To do this, cut off the capillary tube or discharge tube and connect the pressure manifold. If the mechanics are working properly, the compressor should quickly pump up pressure. If air barely blows from the tube or a whistle is heard, it means that the compressor “does not hold” pressure due to wear of the valves or pistons.
⚠️ Attention: Biting off the tubes and breaking the tightness of the circuit requires subsequent professional sealing and vacuuming of the system. You can’t just put the refrigerator back together like that - it won’t freeze without a vacuum and freon.
Also listen to the sounds of the running motor. A uniform hum is normal. A knocking, clanging, grinding or gurgling sound indicates damage to internal parts such as connecting rods, valves or engine mounts. In such cases, repair is not economically feasible.
Replacement of the compressor: when repair is impossible
If the diagnostics showed a break in the windings, a breakdown in the housing or mechanical jamming, the only option is to replace the compressor. For refrigerators Stinol it is important to choose an analogue with similar cooling capacity and type of refrigerant (R134a or R600a). Using an unsuitable motor will lead to ineffective operation or breakdown of the new part.
The replacement process includes: unsoldering old tubes, dismantling the old motor, installing a new one, soldering connections, evacuating the system and charging with freon. This is a complex technological process that requires specialized equipment: a burner, a vacuum pump, scales and pressure gauges.
Is it possible to replace the compressor with a more powerful one?
Theoretically, yes, but this will upset the balance of the system. The evaporator and condenser will not cope with the increased load, which will lead to freezing, increased energy consumption and rapid wear of the new motor.
The cost of a new compressor, along with the work to install it, often makes up a significant part of the price of a new refrigerator. Therefore, before deciding to replace, weigh the pros and cons. If the refrigerator is more than 10-12 years old, sometimes it is more profitable to purchase new equipment that will be more energy efficient and quieter.
What signs accurately indicate a burnt-out compressor?
The exact signs of combustion are: a burning smell, a black coating on the body, winding resistance equal to zero or infinity, as well as a voltage breakdown on the body (short circuit). mass). Also an alarming signal is the knocking out of plugs in the apartment when the refrigerator is turned on.
Why does the Stinol compressor heat up and turn off?
This may be caused by overheating due to a dirty condenser (grid at the back), a malfunction of the thermostat (does not turn off the motor on time) or the beginning of the engine jamming process. It is also possible that the thermal protection itself has lost its properties and operates at lower temperatures.
How much does a new compressor cost for Stinol?
The price of the unit itself varies from 4 to 8 thousand rubles, depending on the manufacturer (original or analogue). However, a complete replacement, taking into account the work of a specialist, soldering and refilling with freon, can cost 10-15 thousand rubles or more.
Is it possible to restore a jammed compressor?
There are methods of “wedging” by applying increased voltage or mechanical action, but they give only a temporary effect. The lifespan of a motor restored in this way is extremely small, and there is a high risk of final failure at any moment.