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Your old but reliable refrigerator suddenly stopped freezing, and you only hear a quiet hum or short clicks instead of the usual rumbling of the compressor? Often the cause of a breakdown is a failed one starting relay, which is responsible for starting the engine. Unlike complex electronic control modules, it is quite possible to replace this mechanical or electromagnetic type unit yourself if you follow safety precautions and have a basic set of tools on hand. Restoring the unit's functionality begins with correct diagnosis and selection of compatible spare parts.
Replacing this small component can give your equipment a second life, saving significant money on calling a technician. However, it is worth understanding that working with high voltage electrical circuits requires extreme concentration and precision. Incorrect connection or ignoring the markings of wires can lead to a short circuit or even failure of an expensive one. In this article we will look in detail at how to safely dismantle the old element, check its functionality and install a new one. compressor. In this article we will look in detail at how to safely dismantle the old element, check its functionality and install a new one.
⚠️ Attention! Before starting any repair work on the refrigerator, be sure to disconnect it from the electrical outlet. Working under voltage is strictly prohibited and dangerous to life.
Diagnostics of a faulty starting relay
Before disassembling the equipment and looking for spare parts, you need to make sure that the problem lies specifically in the starting device. The symptoms of a malfunction of this unit are quite specific and often do not require sophisticated equipment to identify. If you hear the engine trying to start, making a loud click and immediately stopping, this is a sure sign that trigger mechanism is not performing its function. The compressor may hum for several seconds, after which the thermal protection is activated, and the process is repeated cyclically.
Another sign is complete silence when the refrigerator is turned on, although the light in the chamber is on. In some cases, an old relay may become stuck in the on position, causing the motor windings to overheat and the compressor housing to become hot. For a more accurate diagnosis, you can carefully remove the back cover at the bottom of the unit and visually inspect the part for melting, blackening or a burning smell.
There is a simple test method that is often used by craftsmen: if you lightly shake the removed relay near your ear and hear a rattling sound, this means that the internal mechanism is destroyed. A working element should not make any extraneous sounds when shaken. It is also worth paying attention to the condition of the contacts - oxidation or carbon deposits can prevent the normal flow of current.
Necessary tools and safety measures
To successfully carry out repair work, you will need a minimum set of tools, which can usually be found in the garage or a home craftsman's box. The main attention should be paid to safety, since the refrigerator operates on a 220 Volt network. Before starting the operation, make sure that the power cord is unplugged from the outlet and the capacitors (if any in the circuit) are discharged.
You will need the following tools and materials for replacement:
- 🔧 Screwdriver (Phillips and flat) for removing the casing and clamps.
- 🔌 Pliers or side cutters for working with wires and terminals.
- 🧹 Sandpaper or alcohol for cleaning contacts.
- 📷 Smartphone for photographing the connection diagram before disassembling.
- 🧤 Dielectric gloves for additional hand protection.
It is important to choose the correct one starting relaythat matches your compressor model. There are always markings on the body of an old part that need to be rewritten or photographed. There are no universal solutions, since starting currents and winding designs may differ for different motors. Using an unsuitable spare part may result in repeated breakdown or damage to the motor windings.
Removing the old start relay
The dismantling process begins by removing the protective casing at the rear bottom of the refrigerator. It is usually secured with latches or screws. After removing the cover, you will see a view of the compressor - a black metal “barrel”, to which a copper tube and an electrical cable fit. At the end of the compressor, often hidden in a plastic or metal cup, there is the desired unit.
Carefully disconnect the connector with the wires coming from the thermostat and the network. Next, you need to remove the retaining bracket or bar that presses the relay to the compressor terminals. Be careful not to damage the copper tubes of the refrigeration circuit, as damage to them will lead to freon leakage and will require expensive refilling.
Remove the old relay from the compressor terminals. It may fit snugly, so you can wiggle it slightly from side to side. If there is a capacitor (cylindrical part) left at the compressor terminals, it must also be disconnected, remembering the polarity of the connection. In some models of old refrigerators, the condenser is built into the overall structure, in others it is removed separately.
☑️ Dismantling steps
Selecting a compatible spare part and the correspondence table
When purchasing a new part, it is critical pay attention not only to appearance, but also to technical characteristics. The main parameters are the power of the compressor (in watts or horsepower) and the type of refrigerant for which the equipment is designed. The marking on the case usually contains, for example, "R-600a" or "R-134a".
Below is a table of the correspondence of popular types of relays and their characteristics, which will help you navigate when choosing:
| Relay type | Power (W) | Compressor type | Features |
|---|---|---|---|
| RTK-1 | up to 100 | Single-phase | Old Soviet standard, carbolite housing |
| RTK-1-3 | up to 130 | Single-phase | Universal, often used in Atlanta |
| LS-07B | up to 150 | Inverter/Linear | For modern models, requires precise selection |
| PMD 1 | up to 120 | Single-phase | Italian analogue, high reliability |
If you cannot find an original spare part, it is permissible to use universal analogues, but only if the electrical parameters match. Pay attention to the number of contacts and their location. Sometimes a slight modification of the seat or the use of adapters is required, but it is better to avoid such solutions at home.
Is it possible to use a relay of higher power?
Theoretically, a relay with a power reserve will work, but this may lead to incorrect disconnection of the starting winding. This will cause the engine to overheat and shorten its life. It is better to look for an exact analogue.
Connection diagram and installation of a new relay
Installation of a new element is carried out in the reverse order of dismantling. First, make sure that the leads on the compressor are clean and not oxidized. If necessary, carefully sand them with fine sandpaper. Place the new one starting relay on the compressor terminals until it stops. It should fit tightly and not dangle.
The wires are connected according to a previously taken photograph or diagram. Usually the wires are color-coded, but in older technology the colors may fade, so you need to focus on the position of the contacts. The red or brown wire often goes to the starting winding, and the black or blue wire to the common winding. Make sure that the capacitor (if separate) is connected in parallel with the starting winding.
Secure the part with the fixing bracket and connect the power connector. Check the reliability of all connections - they should not turn or fall out when pulled lightly. Only after a visual check can you proceed to test activation.
⚠️ Attention! Never operate the compressor without the relay protection installed and secured. This may result in electric shock or fire.
Testing and first launch
After assembly, plug in the refrigerator. In the first seconds you can hear a characteristic click and hum, which after 1-3 seconds should be replaced by a smooth operating sound of the engine. If the compressor starts and operates without extraneous noise, it means relay replacement it was successful.
Observe the equipment for 10-15 minutes. The compressor should not become overheated and the operating cycle should be stable. If the refrigerator is equipped with a No Frost system, check the operation of the fan in the freezer. The appearance of cold in the chambers will be the final confirmation of the correctness of your actions.
If the motor hums but does not start, or clicks are heard again, immediately turn off the power. This may mean that the wrong relay has been selected, the compressor itself is faulty (turn-to-turn short circuit), or there are problems with the capacitor. Repeated starting attempts can finally finish off the engine.
Frequently asked questions (FAQ)
Is it possible to repair an old relay and not change it it?
In rare cases, if the problem is the contacts sticking due to carbon deposits, you can try to clean them. However, mechanical wear of moving parts or burnout of the thermoelement cannot be repaired. Replacing with a new element is a more reliable and safe solution.
Why does a new relay burn out immediately after installation?
This may indicate a more serious problem, for example, a jammed compressor or an interturn short circuit in the motor windings. In this case, the starting current exceeds the norm, and the relay burns out, acting as a fuse. Motor diagnostics are required.
What is the difference between the relay for R134a and R600a?
The difference lies in the characteristics of the refrigerant and the required pressure in the system, which affects the load at start. Relays for R600a (isobutane) often have lower power and different response parameters. Using the wrong type may lead to incorrect operation.
Is it necessary to replace the capacitor along with the relay?
If the capacitor is swollen, leaking or has lost capacity, its replacement is required. If it looks serviceable and shows the correct capacity on the multimeter, it is not necessary to change it along with the relay, but it is advisable if the equipment is many years old.