The situation when the refrigerator stops working freeze, and the compressor either hums but does not start, or clicks and goes silent, most often indicating a failure of the starting device. Start relay - this is a small but critical element that supplies a starting impulse to the motor winding, forcing it to work. Without a working relay, starting the compressor is impossible, and the products begin to defrost, creating a risk of inventory spoilage.
Replacing this part is one of the most affordable procedures in self-repair of household appliances. You do not need complex equipment or deep knowledge of electrical engineering, just basic accuracy and understanding of the operating procedure. However
In this article we will look at how to correctly diagnose a breakdown, select the appropriate part and connect the relay to the refrigerator compressor. We will look at the nuances of installing devices of different types and answer frequent questions that arise from self-taught craftsmen. Properly executed replacement will extend the life of your refrigerator and restore its ability to maintain the required temperature.
Diagnostics of a faulty start relay
Before disassembling the unit, you need to make sure that the problem lies in the starting device. A characteristic sign of a malfunction is the sound: the compressor tries to start, makes a loud click, followed by silence or humming without rotating the shaft. After some time, the cycle repeats. This indicates that starting winding does not receive the required impulse or the circuit breaks too early.
Visual inspection can also tell a lot about the condition of the part. If the relay has a melted body, blackened contacts, or a burning smell, its operation is impossible. In some cases, a breakdown can be determined by simply shaking the removed relay: if a knock is heard inside, it means that the mechanism is damaged and requires replacement. The integrity of the internal coil or posistor (in modern models) is a key factor in performance.
For more accurate diagnostics, you can use a multimeter. By ringing the contacts, you can determine the presence of a break or short circuit. The resistance of a working element must correspond to the technical characteristics of a particular model, usually several tens of ohms. If the device shows infinity or zero, the part is faulty.
⚠️ Attention: Before any diagnostics and removing the compressor compartment cover, be sure to disconnect the refrigerator from the electrical network! Residual charge in capacitors can be dangerous, so let the equipment stand for 10-15 minutes after unplugging it.
Users often confuse a relay malfunction with a breakdown of the compressor itself. If, after replacing the relay, the engine still does not start or hums, blocked by the protection, the problem may be deeper - a break in the motor windings or a jammed piston group. In this case, simply replacing the starter is not enough.
Selecting a suitable replacement model
The spare parts market offers many options, but universal relays does not exist. Each refrigerator model, be it Indesit, Atlant, LG or Beko, requires a specific device corresponding to the power and type of compressor. Using an unsuitable part can lead to repeated breakdown or even fire.
First of all, pay attention to the markings of the old relay. The manufacturer's code and technical parameters are always marked on the case. If the marking is erased, look for information on the model of the refrigerator or compressor itself. It is important to consider the type of device: electromagnetic (with a coil) or posistor (solid-state). They are not always interchangeable without changing the connection diagram.
When choosing an analogue, pay attention to the location of the contacts and the method of fastening. Even if the electrical parameters match, the housing geometry may not allow the part to be installed in place. For two-compressor models, relays are selected individually for each motor.
| Relay type | Principle of operation | Characteristic signs of failure | Compatibility |
|---|---|---|---|
| Electromagnetic | Closing contacts with a magnetic field | Sticking of contacts, broken coil | Old models (1990-2005) |
| Posistor (PTC) | Heating of the element and increase in resistance | Destruction of the ceramic element | Modern refrigerators |
| Combined | Combination of starting and thermal | Failure of one of the protection functions | Powerful compressors |
| Thermal relay | Opening the circuit when overheated | Deformation of the bimetallic plate | Works in pairs with starter |
If you are not sure of the choice, it is better to remove the old part and take it with you to the store or find a high-quality photo for online ordering. An error in the choice starting element can cost more than the price of the spare part itself if the motor winding burns out.
Is it possible to use a relay from another brand?
Yes, often relays from refrigerators of one manufacturer are suitable for models of another if the markings match and compressor type. For example, Danfoss parts are often found in refrigerators of different brands. The main thing is the coincidence of the electrical characteristics.
Preparation for dismantling and tools
For successful replacement you will need a minimum set of tools. The main requirement is a clean and dry workplace. Water and electricity do not mix, so make sure the floor around the refrigerator is dry and your hands are not wet.
You will need the following tools:
- 🔧 Screwdrivers (flathead and Phillips) to remove the protective panels.
- 🔧 Pliers or pliers for careful removal terminals.
- 🔧 Multimeter for checking contacts (preferably).
- 🔧 Flashlight for illuminating the compressor compartment.
The process begins by removing the rear protective panel of the refrigerator. It is usually secured with screws or snaps. Be careful not to damage the condenser tubes that may run near the fasteners. After removing the panel, you will gain access to the compressor located at the bottom of the unit.
On the compressor, the relay is attached directly to the winding terminals. Before removing, take a photo of the position of the wires and the part itself. This will help avoid assembly errors. If the wires are color coded, write down which color went to which contact.
☑️ Ready for repair
The process of removing the old relay
Removing a faulty part requires care. The relay can be mounted on a bracket, a spring, or simply pressed tightly onto the compressor contacts. Some models, for example, in Indesit or Ariston, use a fixing bracket that needs to be bent.
First, disconnect the wires going to the relay. They can be held on terminals or soldered. If the terminals are oxidized, they can be carefully cleaned, but it is better to replace the terminal blocks if possible. Do not pull the wires sharply so as not to break them at the base.
Then remove the relay itself from the compressor pins. It is removed by moving upwards or to the side, depending on the design. If the part fits very tightly, you can rock it slightly, but avoid excessive force so as not to break the plastic terminals of the compressor. Thermal relayif it is combined with the starter, it can be removed together with it or separately, depending on the design.
⚠️ Caution: Do not attempt to disassemble the relay housing for repair. Inside there are fragile elements (posistor or coil with a core), which are almost impossible to restore efficiently. It is cheaper and more reliable to buy a new part.
After removal, inspect the contacts on the compressor. If they are oxidized or have traces of carbon deposits, they must be carefully cleaned with fine sandpaper or a file. Clean contact is the key to stable operation and absence of sparking.
Connection diagram and installation of a new relay
Installation of a new element is carried out in the reverse order of removal. The main rule is the correct matching of contacts. There are markings on the body of the new relay and on the compressor: R (Run) - working winding, S (Start) - starting winding, L or M - line (phase). Mixing up these contacts can lead to instant combustion of the part.
Push the relay onto the compressor pins until it stops. Make sure it fits snugly and doesn't wobble. If the design includes a retaining frame or spring, install it in place. Then connect the wires to the appropriate terminals, referring to the photo or color scheme you took earlier.
Check the connections for security. All terminals must fit tightly. If you are using a universal relay that comes with an adapter kit, choose the one that best fits your compressor geometry. Sometimes it is necessary to slightly bend the contacts for a tight fit.
After connecting all the wires, you can proceed to assembling the case. Replace the back panel and secure with screws. Make sure that no wires are pressed against the panel or touching hot parts of the compressor or pipes.
Testing and first start-up
After installation is complete, the moment of truth comes. Plug in the refrigerator. In the first seconds, you can hear the characteristic click and rumble of the engine starting. If the compressor started working smoothly, without humming or vibration, and after a while the compressor tubes began to heat up, you have succeeded.
Pay attention to the operation of the refrigerator during the first hour. It should start to gain temperature. If the compressor works, but the cold does not flow, perhaps the problem was not only in the relay, but also in a freon leak or a clogged system. However, if the motor starts and runs stably, the probability of success is high.
If you hear a clicking sound and the motor stops talking again, immediately turn off the power. This means that either the relay is selected incorrectly, or the problem is in the compressor itself (turn-to-turn short circuit). Repeated starting attempts can finally finish off the engine.
Do not forget that after replacing the relay, the refrigerator may require several hours of operation to reach the set temperature. Do not load the chamber with food immediately, let the equipment collect the cold empty.
Frequently asked questions (FAQ)
Is it possible to install a relay from another refrigerator if the markings do not match?
Theoretically, it is possible if the electrical parameters (current, voltage) and the connection diagram match. However, without precise knowledge of the characteristics, the risk of error is high. It is better to look for a complete analogue by code or use cross-number tables.
Why does a new relay burn out after a few days?
This may indicate problems with the compressor itself (for example, it “pulls” too much current when starting up due to wear) or voltage surges in the network. Also, the cause may be incorrect installation (wrong side).
Is it necessary to defrost the refrigerator before replacing the relay?
Complete defrosting is not necessary, since access to the compressor is from the outside. However, if there is a lot of ice in the chamber and there is a risk of water getting on the electrics when moving the refrigerator, it is better to defrost it and turn it off in advance.
What is the difference between a posistor relay and an electromagnetic one?
Electromagnetic uses a coil and a movable core to close the contacts. The posistor has no moving parts; it uses a ceramic element that changes resistance when heated by current. They have different operating principles and compatibility.
How much does it cost to replace a relay at a service center compared to self-repair?
The cost of the part itself ranges from 300 to 1500 rubles. The work of a service technician can cost from 1,500 to 3,000 rubles and more, plus travel. Self-replacement saves the budget, but requires time and accuracy.