The situation when the refrigerator stops freezing, and only a hum or clicks are heard from the engine compartment, is familiar to many owners of household appliances. Often the reason for this behavior is a failure starting relay, which is responsible for starting the compressor engine. This small device controls the supply of voltage to the motor windings, and if it is broken, the refrigerator simply will not turn on. Before calling a technician, you should try to carry out diagnostics yourself, since replacing this part often does not require complex equipment.
In this article we will look at how to properly remove the relay, check its functionality and understand whether it needs replacement. You will learn what tools you will need for the job, how to safely get to the unit and what to look for when inspecting the contacts. DIY Repair can save a significant amount if the problem really lies in this inexpensive component.
Sometimes the cause of the malfunction is not the relay itself, but oxidized contacts or a burnt-out compressor winding. It is important to be able to distinguish between these conditions so as not to spend money on a new part unnecessarily. We will look at the main symptoms of a breakdown and methods for checking them, which will help you make the right decision. If you are ready to carefully work with electrical components, you can begin to study the instructions.
Signs of a faulty starting device
The first signal of problems with starting the compressor is often a characteristic sound. Instead of the usual smooth hum of a running motor, you may hear short clicks that are repeated at regular intervals. This means that the relay is trying to start the engine, but is unable to cope with the task and opens the circuit. After a few seconds or minutes, the cycle repeats again.
If you touch the compressor housing after several such attempts to start, it may be hot, although the refrigerator itself remains warm inside. Thermal relayThe built-in protection system is triggered by overheating and turns off the power to prevent the windings from burning out. In some cases, you may notice a burning smell or see sparking in the motor area if you remove the back cover.
⚠️ Attention: If you smell melted plastic or see smoke, immediately unplug the refrigerator cord from the outlet. Further attempts to turn on may result in a short circuit or fire in the wiring.
It is also worth paying attention to how long the refrigerator operates before shutting down. A working unit gains temperature and turns off for a long rest. If the engine runs for a very short time or, conversely, hums for hours without stopping, trying to start, this is a sure sign of a malfunction of the starting system. In rare cases, the relay may stick when it is on, which leads to constant operation of the compressor.
Diagnostics always begin with a visual inspection and listening to the operation of the unit. Noisy start-up or its absence when the light in the chamber is on are the first “bells”. Do not ignore these symptoms, since prolonged operation in emergency mode can permanently damage the compressor itself, the replacement of which is very expensive.
Necessary tools and safety measures
Before you begin disassembly, you need to prepare the workplace and tools. You don't need a complex professional kit, but a basic DIY kit is a must. The main rule is safety, since you will be working with electrical devices, even if they are disconnected from the network.
For work you will need:
- 🔧 Screwdrivers (Phillips and flat) for removing the protective cover and clamps.
- 🔨 Pliers or pliers for neat removing terminals and fixing wires.
- 🧤 Dielectric gloves to protect hands from possible residual charges and sharp edges.
- 🧹 A hard bristle brush and alcohol to clean contacts from oxides and dirt.
- 🔦 Flashlight for good engine lighting compartment.
The most important rule is to completely disconnect the refrigerator from the power supply. Simply turning off the button is not enough, you need to unplug the plug from the socket. After this, it is advisable to wait 10-15 minutes for the capacitors to discharge and the refrigerant in the system to stabilize. Electrical safety is priority number one.
It is also worth clearing access to the back wall of the refrigerator. Move the unit away from the wall so that it is convenient for you to work from all sides. Make sure the floor under your feet is dry and there is adequate lighting in the room. If you plan to place the refrigerator on its side for convenience, do it carefully so as not to damage the pipes or decorative elements.
☑️ Preparation for repair
Access to the compressor and removal of the casing
The start relay is located directly on the compressor housing, which is usually located in the lower rear part of the refrigerator. To get to it, you need to remove the protective plastic cover covering the engine compartment. In different models of refrigerators, be it Indesit, Atlant or Beko, the fastening of this cover may differ.
Most often the casing is secured with latches or screws. If you see screw heads around the perimeter of the lid, carefully unscrew them. If there are no screws, then the panel is held on by plastic clips. In this case, you need to carefully pry the edge of the cover with a flat screwdriver and, pressing on the latches, remove it. Do not use excessive force to avoid breaking the plastic.
Once the cover is removed, you will be presented with a view of the compressor - a black metal “tank” with copper tubes and an electrical cable going to it. The relay is usually placed on the side of the protruding motor shaft. There may be a lot of dust around, which it is advisable to first remove with a brush or vacuum cleaner so that it does not get inside the mechanisms.
Sometimes access to the relay is difficult due to the dense arrangement of the tubes or the presence of additional elements. In such cases, partial dismantling of surrounding parts may be necessary. Be careful: the copper tubes of the cooling system are very thin and fragile. Damage to the tube will lead to freon leakagewhich will make repairs economically impractical.
If you see that the wires approach the relay through an additional plastic box or clamp, they may also need to be carefully bent or unfastened. The main thing is to provide free access to the starting device itself so that it can be removed without jerking or pulling on the wires.
How to remove and open the starting relay
The process of removing the relay itself usually does not cause difficulties if you act sequentially. The device is a plastic box placed over the contacts of the compressor. Wires approach it from below, and it itself can be fixed with a metal bracket or simply held in place due to a tight fit.
The procedure is as follows:
- 🔌 Carefully remove the connector with the wires, if it is connected separately, or disconnect the terminals.
- 🔩 If the relay is fixed metal bracket (U-shaped or round), pry it with a flat screwdriver and remove.
- 🖐 Take the relay body with both hands and remove it from the compressor pins with a rocking motion.
Do not pull the relay by the wires! This can lead to them breaking at the very base, which will require soldering and complicate repairs. All movements must be directed towards the body of the device. If the relay sits very tightly, you can slightly shake it from side to side, helping yourself with your fingers.
After removing the relay, it must be opened for inspection. Most modern relays have a non-separable housing, held together with plastic latches. To open such a relay, you need to carefully insert the blade of a flat-head screwdriver into the seam between the two halves of the housing and turn it. Be careful not to crumble the plastic.
⚠️ Attention: Some relay models (especially old or specific ones) may be filled with compound or glued. If, after disassembling the latches, the case does not open, it may be a disposable device, and it is easier to replace it entirely than to try to restore it.
Inside you will see contacts, springs and, possibly, traces of burning or melted plastic. It is this internal mechanism that is responsible for switching. If the case is cracked when opened, this is not a problem for functionality, the main thing is that the internal contacts and coil are intact. For further diagnostics, it is important to understand the type of your relay.
Relay types
There are two main types of starting devices used in refrigerators: posistor (solid-state) and induction (with a coil). PTCs look like a tablet inside the case and have no moving parts; they are checked with a tester. Induction ones have a moving core and contacts that can stick or burn.
Diagnostics and performance testing
After opening the relay, it is necessary to carry out a visual and instrumental inspection of it. The first thing that catches your eye is the state of the contacts. If they are blackened, covered with soot or oxidized, this makes it difficult for current to pass through. In induction relays, the movable core must move freely inside the coil.
For accurate diagnostics, you will need a multimeter. Switch the device to continuity or resistance measurement mode. Check the integrity of the coil winding: the probes are applied to the coil contacts, the device should show resistance (usually several tens of ohms). If the resistance is infinitely high - an open circuit, if it is zero - a short circuit.
The table below will help you navigate possible malfunctions:
| Symptom | Possible cause | Solution |
|---|---|---|
| The relay heats up, but does not click | Breakage of the winding or malfunction of the posistor | Replacing the relay |
| Severe crackling and sparking | Burning of contacts | Cleaning the contacts or replacing |
| The compressor hums, but does not start | Sticking core or weak spring | Cleaning the mechanism or replacing |
| The refrigerator turns on immediately turns off | Malfunction of the thermal relay or compressor | Checking the compressor |
If you find that the contacts are simply burnt, they can be carefully cleaned with fine sandpaper or a file. The main thing is not to remove too much metal and not disturb the geometry of the plates. After cleaning, reassemble the relay and try to start the refrigerator. However, if the relay is a posistor, it can only be replaced, since there is nothing to clean there.
Also check the thermal relay (if it is placed separately or is part of the structure). It should open the circuit when heated. Ring his contacts when cold - they should ring. If the circuit is open when the relay is cold, it is faulty.
Replacement of the part and assembly of the system
If repair is impossible or impractical, the relay must be replaced. When purchasing a new part, pay attention to the markings. The relays must match the power of your compressor and the type of refrigerant. Universal relays exist, but it is better to look for an original or a high-quality analogue for your refrigerator model.
Installation is carried out in the reverse order. Push the relay onto the compressor pins as far as it will go. Make sure it fits snugly and doesn't wobble. If there was a metal bracket, return it to its place. Connect the wires according to the diagram (or the photo taken earlier).
Typical assembly sequence:
- 📷 Check the connection photo before connecting the wires.
- 🔌 Place the terminals on the relay contacts until a characteristic click is heard.
- 🛡 Replace the protective cover of the engine compartment.
- 🔌 Plug in the refrigerator and listen to it start.
After turning on, listen to the operation of the motor. The launch should be confident, without prolonged buzzing or clicking. After 10-15 minutes of operation, check whether the relay itself is heating up. It may be warm, but not hot. If everything went well, you can push the refrigerator into place.
For example, in refrigerators Stinol or Indesit there are often relays of the type PTCthat are easy to change. Older models may have heavy induction relays that require precise orientation during installation (up arrow). should be accompanied by a quiet, confident start of the compressor and the absence of repeated clicks in the first minutes of operation. Zil or Biryusa There may be heavy induction relays that require precise orientation during installation (arrow up).
Frequently asked questions (FAQ)
Is it possible to repair a burnt-out relay or just replace it?
In most cases, modern posistor relays cannot be repaired; they change completely. You can try to revive induction relays with burnt contacts by cleaning them, but this is a temporary measure. It is more reliable and safer to install a new part, since the cost of the relay is low.
Why does a new relay burn out after a short time?
This may indicate a more serious problem, for example, an interturn short circuit in the compressor windings or problems with the voltage in the network. The reason may also be the incorrect selection of relays by power or type. In such cases, diagnostics of the refrigerator motor itself is required.
Where can I find the markings for selecting an analogue?
The markings are usually applied to the side or top edge of the relay itself. Look for numbers and letters that indicate the manufacturer and type (for example, 11020, R600a, etc.). You can also select a relay according to the compressor model, information about which is on the sticker on the motor housing.
Is it dangerous to operate a refrigerator with a faulty relay?
Yes, it is dangerous. Constant attempts to start can lead to overheating and fire of the wiring or the compressor itself. In addition, this puts a strain on the electrical grid. At the first sign of a malfunction, it is better to stop operation before repair.
How much does it cost to replace the starting relay?
The cost of the part itself varies from 300 to 1500 rubles, depending on the model and manufacturer. If you do it yourself, you only pay for the part. The services of a specialist will cost extra, but they provide a guarantee for the work.