How to remove the relay on the refrigerator: step-by-step instructions

A sudden stop of the refrigerator or a characteristic click, followed by a hum, but no start, often indicates problems with the starting mechanism. Start relay is a small, but a critical element of the electrical circuit responsible for starting the compressor motor. Without its correct operation, the motor cannot switch from rest mode to operating state, which leads to defrosting of the chamber and spoilage of food.

Many owners of household appliances panic at the first sign of a breakdown, believing that an expensive call to a technician or replacement of the entire unit will be required. However, in most cases, diagnostics relay replacement is quite within the capabilities of a home craftsman with a minimal set of tools. Understanding the operating principle of this unit will help not only save your budget, but also quickly bring the refrigerator back to life.

In this article we will analyze in detail the trigger mechanism, the safe dismantling algorithm and methods for testing the part for functionality. You will learn how to distinguish a burnt-out relay from other faults and what to look for when installing a new component.

Design and principle of operation of the starting relay

To correctly remove and replace the part, you need to understand how it works. The start relay is an electromagnetic or posistor switch that briefly supplies voltage to the compressor start winding. As soon as the engine reaches the required speed, the relay opens the circuit, leaving only the working winding active.

In modern models of refrigerators, such as Indesit, Beko or LG, posistor relays are most often used. They do not have moving mechanical parts, but work by changing the resistance of a special ceramic element when heated. Electromagnetic analogues, characteristic of older Soviet models such as ZIL or Biryusa, use a contact system and a coil.

• 🔌 Contact group —provides connection to the windings compressor.
• ⚡ Posistor or coil —the main working element that responds to current.
• 🛡️ Housing —protects internal components from moisture and dust.

The malfunction of this unit often manifests itself in the form of cyclic clicks: the refrigerator tries to start, a click is heard, but the compressor does not start, and after a while the attempt is repeated. This indicates that the starting winding circuit does not close or does not open in time.

Necessary tools and safety measures

Before starting any work with electrical appliances, the rule is to completely de-energize. Unplug the refrigerator cord from the outlet. It is not enough to simply turn off the light in the camera or press a button on the display; the current must be completely disconnected from the network.

⚠️ Attention: Even after disconnection from the network, a residual charge may remain in the capacitors. Be careful when touching the metal contacts of the compressor and avoid shorting the terminals with your fingers or tools.

To carry out dismantling, you will need a minimum set of tools that can be found in any home. The main work can be done using screwdrivers, but additional devices may be needed for high-quality diagnostics.

• 🔧 Screwdriver - Phillips or flat, depending on the type of casing fastener.
• 🧤 Dielectric gloves - for additional protection when working with electrical equipment.
• 🔍 Multimeter —necessary for checking circuit continuity and resistance.
• 📸 Smartphone —to photograph the connection diagram before disassembling.

The workplace should be well lit. The compressor is usually located at the bottom rear of the refrigerator, so you will have to bend over or lay the unit on its side. If you decide to place the refrigerator, do it on the side opposite the side where the compressor is located, so that oil does not flow into the refrigerant circulation system.

Location of the relay and access to the compressor

The starting relay is always attached directly to the compressor housing. In most modern refrigerators, it is covered with a plastic protective casing, which can be screwed on or snapped onto clips. Remove the back panel of the refrigerator, if there is one, to gain free access to the motor.

Visually, the relay looks like a small black or white box placed on three pins coming out of the compressor. The wires from the power cord fit into this box. The case often has markings or a diagram indicating the model, for example PTMRS or RKT.

Before removing the part, carefully inspect the wires. They should not be frayed or melted. If you notice traces of burning or smell burning plastic, this is a sure sign of a short circuit inside the assembly.

Access to the relay may be difficult if the refrigerator is located close to the wall. Move the unit away, giving yourself room to maneuver. Do not pull the wires sharply so as not to damage the terminals.

Step-by-step instructions: how to remove the relay

The dismantling process is quite simple, but requires care. The main thing is not to damage fragile plastic elements and contacts. Follow the algorithm to avoid unnecessary problems.

First you need to free the relay from the fixing elements. In some models, it is held on a metal spring bracket, which must be carefully pressed out with a screwdriver. In other cases, a plastic clamp or screw is used.

After removing the clamp, the relay must be pulled off the compressor contacts. It fits quite tightly, so some force may be required. Take the part by the body, not by the wires, and remove it downwards using a rocking motion. Be careful: there may be a drop of oil or condensation inside.

⚠️ Attention: Never try to remove the relay by pulling the wires that go to it. This will lead to a break in the wires inside the insulation, and then repairing the electrical part will become much more difficult.

When the relay is removed from the compressor pins, disconnect the electrical terminals. They can be removed separately or be part of a single connector. If the terminals are oxidized, they can be carefully cleaned with fine sandpaper or alcohol.

Diagnostics and performance testing

After removing the part, you need to understand whether it can be repaired or requires replacement. A visual inspection often gives the first answers: a swollen body, melted holes or a characteristic burning smell indicate failure.

For a more accurate diagnosis, use a multimeter. A posistor relay in a cold state should have a low resistance (usually a few ohms). If the device shows infinity (open circuit) or zero (short circuit), the part is faulty.

The electromagnetic relay can be checked by shaking it near the ear. If a rattling sound is heard inside, it means the contacts or core are damaged. Also check the integrity of the coil for a break.

If the relay is working properly, but the refrigerator does not work, the problem may lie in the compressor itself or the thermostat. However, statistics show that it is the starting relay that fails most often.

Installing a new relay and checking the start-up

When purchasing a new part, make sure that it fully matches the markings of the old one. Even externally identical relays can have different current and voltage characteristics. The model must match the type of compressor of your refrigerator.

Installation is performed in the reverse order. Place the terminals onto the relay contacts, then press the housing tightly onto the compressor pins. Make sure that the relay is seated all the way and is secured with the fastener. Check that the wires do not touch the hot parts of the compressor.

Plug in the refrigerator. In the first seconds you can hear a characteristic click and the engine starts. If the compressor started working smoothly and after some time cold appeared in the chambers, then the repair was successful.

What to do if the new relay burned out immediately?

If after installing a new part the situation repeated itself, the problem lies deeper. Most likely, the compressor itself is faulty (turn-to-turn short circuit) or there are problems with the wiring. In this case, professional diagnostics are required.

Pay attention to the operating time of the refrigerator. If it works without interruption or, conversely, turns on and off too often, a relay may have been selected with inappropriate parameters.

Frequent replacement errors and expert advice

One ​​of the common mistakes is ignoring the state of the contacts on the compressor itself. If the pins are oxidized or burnt, the new relay will quickly fail. Clean them before installation.

Also, do not use a relay from another refrigerator model by eye. The difference in the cut-off current can lead to the fact that the relay is either constantly turned on (overheating of the windings) or does not turn on the starting winding at all.

• ❌ Ignoring cleanliness - dust and moisture inside the casing can cause breakdown.
• ❌ Strong force - excessive pressure during installation can split the ceramic posistor.
• ❌ Lack of fixation - a poorly secured relay will vibrate, which will lead to broken contacts.

Remember that the compressor is the heart of the refrigerator, and the start relay - its valve. Replace responsibly. If you are not confident in your abilities, it is better to contact a specialist so as not to aggravate the breakdown.

⚠️ Attention: Technical characteristics of compressors and relay types may vary depending on the year of manufacture and manufacturer. Always check the markings on the nameplate of your device with the parameters of the new part.

Questions and answers (FAQ)

Is it possible to start a refrigerator without a relay?

Theoretically, you can start the compressor by applying voltage directly to the starting winding, but doing this is strictly not recommended. Without a relay, the engine will not be able to reach operating speeds, it will quickly overheat and burn out. The relay provides the necessary phase shift and disconnection of the starting winding.

Why does the relay make a loud click?

The click is the sound of the contacts opening or closing inside the relay (in electromagnetic models) or the crackling sound of a heating posistor. If the clicking sounds are repeated every few seconds and the refrigerator does not start, this is a sign of a faulty relay or compressor.

How often should the start relay be replaced?

The service life of the relay is usually 5-10 years or more. It does not require scheduled replacement if it works correctly. They change it only when signs of malfunction appear: failure to start, overheating or visible damage.

Is a universal relay suitable?

There are universal starting relays that are suitable for a wide range of compressors. However, it is best to use an original part or a complete analogue recommended by the manufacturer to guarantee stable operation and durability.