Sudden stoppage of the compressor or loud clicks when trying to start the refrigerator often indicate a faulty starting mechanism. It is starting relay responsible for supplying a starting pulse to the motor winding, and its failure is one of the most common causes of breakdowns of household appliances. Many owners, faced with such a problem, immediately call a technician, but even a person without deep technical knowledge can independently diagnose and replace this unit, if they act carefully.
Before you start disassembling, you must clearly understand that you will be dealing with electric current and fragile components of the cooling system. Start-protective relay — This is a compact unit mounted directly to the compressor housing at the rear of the unit. Its dismantling does not require complex special tools, but requires compliance with safety precautions and attention to detail, since damage to contacts or incorrect assembly can lead to the final failure of an expensive compressor.
In this article we will analyze in detail the process of removing the relay, its visual inspection and testing. You will learn how to properly prepare a workplace, what tools you will need, and what design nuances of different brands you should pay attention to. A competent approach to this issue will save time and money by restoring the refrigerator to working order in the shortest possible time.
Preparation of the workplace and necessary tools
The success of any repair operation depends 80% on quality preparation. Before moving your refrigerator away from the wall, make sure you have enough room to maneuver behind the unit. You will need good lighting as the compressor area is often obscured by housing components or boots. It is also necessary to ensure a stable position of the refrigerator so that it does not swing during operation.
To dismantle the relay, you will need a minimum set of tools, which can be found in the drawer of every home craftsman. The main tool will be a flat-head screwdriver, preferably with a thin and durable tip, to carefully pry off the plastic clips. You may also need pliers with narrow jaws for working with spring clamps and side cutters if you need to remove oxidized parts of the wires (although this is a last resort).
Be sure to prepare a container for storing small parts, such as screws or removed clamps, so that they do not get lost in the carpet pile or floor crevices. It would be a good idea to have a multimeter on hand to subsequently check the integrity of the contacts, although the disassembly itself can be done without it. It is important that your hands are dry and the floor under your feet is not slippery.
☑️ Tools for dismantling the relay
Safety measures and turning off the power supply
The most A critical step before starting any work with electrical appliances is to completely de-energize the device. Unplug the refrigerator from the socket. Do not rely solely on a circuit breaker or extension cord unless it is guaranteed to completely break the circuit. Even after switching off, a residual charge may remain in the capacitors, so you should not touch live parts with your bare hands in the first minutes after switching off.
Move the refrigerator from the wall to a distance sufficient for free access to its rear panel. Be careful: the unit may be heavy and the flooring may be slippery. If the refrigerator is built-in, it must first be removed from the niche, following the installation instructions for the specific model. Make sure that there is nothing behind you that interferes with your access to the compressor.
⚠️ Attention: It is strictly forbidden to carry out any manipulations with the electrical components of the refrigerator while it is connected to the network. Electric shock can be fatal, even if the voltage appears low.
Allow the compressor to cool if it was running before the breakdown occurred. The metal tubes and the motor housing itself may be hot, and accidental contact may result in burns. In addition, cooled metal is less susceptible to deformation due to accidental mechanical impact from a tool. Wait 15–20 minutes before starting the active phase of work.
Access to the compressor and removal of the protective casing
The compressor in modern refrigerators is located at the lower rear of the unit and is often covered with a metal or plastic casing. This screen protects the motor from dust, moisture and accidental mechanical damage, and also reduces noise levels. Depending on the model of the refrigerator (Indesit, Atlant, Bosch or LG), the method of attaching the casing may differ: it can be held on with screws, latches, or simply put on top.
If the casing is secured with screws, carefully unscrew them using a suitable screwdriver. Place the fasteners in the prepared container. If the lid is held on by latches, do not use excessive force - the plastic becomes brittle over time and may crack. Carefully pry the edges of the cover with a flat-head screwdriver in several places, gradually releasing the latches around the perimeter.
After removing the protective screen, you will see a view of the compressor - a black metal “tank” with matching copper tubes. A small plastic or metal cup is attached to the side or bottom of it - this is the start relay housing. Wires from the thermostat and the compressor itself are connected to it. Carefully inspect the area around the relay: sometimes it is additionally fixed with a metal bracket or clamp, which will need to be released.
| Type of housing fastening | Tool | Removal features |
|---|---|---|
| Screw connection | Phillips or flat-head screwdriver | Do not strip the thread, unscrew completely |
| Plastic latches | Flat screwdriver | Act carefully so as not to break the plastic |
| Metal clamp | Pliers | Unclench carefully so as not to get hurt on sharp edges |
| Removable cap (without fasteners) | Hands | Simply remove upwards or to the side |
Removing the start relay: step-by-step instructions
Now we move on to the most crucial moment - removing the relay itself. It is mounted on three pins coming out of the compressor. In some models, the relay is simply put on top and is held in place by a tight fit and its own weight, in others it is secured with a spring clip or screw. Before pulling, carefully inspect the base of the device.
If you see a metal bracket or spring clip, it must be carefully pressed out. Use a flathead screwdriver or pliers to pry the stopper out of the way. After this, the relay housing should be easily removed from the compressor pins. Do not pull sharply - there may be liquid freon or oil inside, and a sudden movement can damage the ceramic insulators of the pins.
After you have removed the relay from the compressor, you need to disconnect the electrical terminals. Wires are usually connected through connectors, which can be quite tight. Grasp the plastic connector (block) itself, not the wire, and, shaking it from side to side, pull it off. If the terminals are oxidized and cannot be removed, you can lightly warm them with a hairdryer or use contact spray, but under no circumstances pull the wire insulation - it may break.
⚠️ Attention: When removing the relay, pay attention to its orientation. The housing is often marked "UP" or an arrow to indicate the correct position. Installing the relay upside down will cause it to immediately break when turned on.
In some older refrigerator models, the wires may not be on the connectors, but soldered or connected through screw terminals inside the relay housing. In this case, before disconnecting the contacts, be sure to write down or photograph the connection diagram. The color marking of wires may differ from one manufacturer to another, and you cannot rely on it alone.
What to do if the relay cannot be removed?
If the relay is not removed from the compressor pins, do not use brute force. Perhaps it has become stuck due to high temperature or is fixed with a hidden clip. Try gently rocking it from side to side by grasping the base. If there is a fastening screw, check again to see if it is hidden under a sticker or a layer of dirt. As a last resort, you can use penetrating lubricant (WD-40), but it must be applied pointwise, avoiding contact with electrical contacts and inside the compressor.
Visual inspection and initial diagnostics
After removing the relay from its seat, it is necessary to conduct a thorough visual inspection. The device body must be intact, without cracks, melting or traces of burning. The presence of black soot or the characteristic smell of burnt plastic clearly indicates overheating and failure of the internal components.
Shake the relay near your ear. If a clear knocking or rattling noise is heard inside, this means that the contacts are stuck or the internal mechanical part has collapsed (in a relay with a posistor or electromagnetic). A working relay should not make sounds when shaken. Also inspect the contact groups for oxidation - a green or white coating indicates poor contact and the need for cleaning or replacement.
Pay attention to the compressor pins from which the relay was removed. They must be clean, without soot and traces of sparking. If the pins are blackened or the insulation around them has melted, the problem may be deeper than just a faulty relay. In this case, more serious diagnostics of the entire electrical circuit of the refrigerator is required.
Table of typical faults and symptoms
Understanding the symptoms helps to more accurately diagnose the problem even before disassembly. Below is a table that will help compare the behavior of your refrigerator with possible causes of relay malfunction.
| Symptom | Possible cause in the relay | Action |
|---|---|---|
| Loud click and stop | Sticking of contacts or burning of a posistor | Replacing the relay |
| The refrigerator hums, but does not start | Open circuit or mechanical jamming | Checking with a multimeter |
| The compressor works without stopping | The contacts are welded in the closed position | Urgent replacement |
| Periodic clicks every 2-3 minutes | Thermal protection triggered due to faulty relay | Diagnostics and replacement |
Checking integrity with a multimeter
For those who want to be 100% sure of the diagnosis, it is recommended to check the relay using a multimeter. Switch the device to the dialing mode (resistance measurement). First check the circuit between the input and output pins. In normal condition (depending on the type of relay), there should be either no resistance (open) or close to zero (short).
If you have a relay with a posistor (PTC), measure the resistance between the contacts. It should be several tens of ohms (usually from 10 to 50 ohms). If the device shows infinity (one on the screen) or zero, it means the posistor is burnt out or broken. Electromagnetic relays are checked for the absence of a short circuit between the coil and the housing, as well as for the integrity of the windings.
Some defects appear only under load or when heated. Therefore, if a visual inspection reveals traces of burning or the relay makes sounds when shaken, replacement is necessary regardless of the tester readings. The cost of a new relay is not comparable with the risk of burning out the compressor.
Can the relay be repaired?
Theoretically, some types of relays (especially old electromagnetic ones) can be disassembled, clean the contacts with a file, or replace the posistor. However, modern relays are often made in a non-separable cast housing. Even if you manage to open the case, it is impossible to guarantee reliable operation after repair. Considering the low cost of new components, repairing an old relay is considered economically impractical and risky.
Frequently asked questions (FAQ)
Is it possible to start a refrigerator without a relay?
Theoretically, you can start a compressor without a starting relay using a button or a special starting device, but do This is categorically not recommended in domestic conditions. Without a relay, the compressor will not be able to start normally, it will hum and quickly overheat, which will lead to burnout of the windings. This is an emergency mode only for diagnostics by the technician.
Is a relay from another refrigerator suitable?
The relay is selected strictly according to the compressor power and the type of refrigerant, and not just by the brand of the refrigerator. The relay body is marked (for example, R600a or R134a) and the power range (HP). Using the wrong relay will quickly damage the new device or the compressor itself. Always check the article numbers.
Why did the relay burn out?
There may be several reasons: power surges in the network, natural wear of the contacts, frequent turning on/off of the refrigerator, a malfunction of the compressor itself (turn-to-turn short circuit) or poor contact in the terminal block, causing heating. Often the relay is a “victim” and not the root cause of the problem.
How often do you need to change the starting relay?
The starting relay is not a consumable item and does not have a regulated replacement period. It lasts until it breaks. On average, a quality component can last 10 years or more. Replacement is made only when signs of a malfunction appear: the refrigerator has stopped freezing, clicks or buzzing are heard without starting.