Sudden stoppage of the compressor or characteristic clicks when trying to start the refrigerator often indicate a malfunction of the starting mechanism. It is start relay responsible for supplying voltage to the windings of the electric motor, ensuring its start and subsequent operation. If this small but critical component fails, the refrigerator stops cooling and food begins to spoil.
Many home appliance owners immediately call a technician, but the process of replacing the relay is often simpler than it seems at first glance. In this article we will look in detail at how to remove the relay from the refrigerator, what tools will be needed and what to pay special attention to when doing it. Video materials and step-by-step photos will help you perform repairs efficiently and safely, saving your budget. diagnosis. Video materials and step-by-step photos will help you complete repairs efficiently and safely, saving your budget.
Before you begin disassembling, it is important to understand that a relay is an electrical device that requires precautions. Improper handling of compressor components may result in electric shock or damage to the motor itself. Therefore, carefully study the theoretical part and prepare the workplace before starting work.
Symptoms of a faulty start relay
The first step to successful repair is correct identification of the problem. Start relay (often called the start relay) can fail for various reasons: power surges, overheating, contact wear or moisture ingress. Understanding the symptoms will help you not waste time replacing serviceable parts.
Most often, a breakdown is indicated by a characteristic sound. The refrigerator may hum for a few seconds, after which a loud click is heard and the motor stops. After some time, the cycle repeats. This indicates that the relay is trying to start the compressor, but cannot, and the thermal protection is triggered.
- 🔊 Loud clicks at regular intervals (every 10-30 seconds).
- ❄️ Complete absence of cold in the refrigerator and freezer compartments when running light.
- 🔥 Strong heating of the compressor housing (more than 60-70 degrees) when the engine is not running.
- ⚡ Broken plugs or tripped circuit breaker in the electrical panel at the time of startup.
Sometimes the relay can “stick” in the on position. In this case, the compressor hums continuously, but does not start, quickly overheats, and the refrigerator has to be turned off manually. If you notice that the relay Indesit or Atlant has traces of burning or melted plastic, replacement is definitely required.
⚠️ Attention: If after replacing the relay the compressor continues to hum but does not start, the problem may be in the engine itself (turn-to-turn short circuit) or in the piston group. Do not try to start such a refrigerator repeatedly - this may permanently damage the compressor.
It is also important to consider that some modern models of refrigerators, for example, from Liebherr or Bosch, can use inverter compressors. They do not have a classic starting relay; its functions are performed by an electronic control unit. Therefore, if you have an inverter model, the mechanical replacement described here does not apply.
Necessary tools and preparation
In order to remove the relay from the refrigerator, you do not need complex professional equipment. The entire set of tools can be found in any home craftsman's drawer. The main thing is to ensure the safety and cleanliness of the work process.
First of all, you will need screwdriver. Depending on the model of the refrigerator and the type of fastening of the compressor casing, this may be a Phillips (Philips) or flat-blade screwdriver. Sometimes a socket wrench is required to remove the protective cover on the rear wall of the unit.
- 🔧 A set of screwdrivers (phillips and flat) for removing fasteners.
- 🧤 Dielectric gloves for protection against residual voltage.
- 📸 Smartphone or camera for photographing the wiring diagram.
- 🧹 Dry rags and alcohol-containing liquid for cleaning contacts.
Pay special attention to preparing the workplace. The refrigerator must be moved away from the wall, allowing access to the rear. The compressor must be cold, so after unplugging the device, let it stand for at least 15-20 minutes. This will also allow the refrigerant and oil to drain into the condenser, reducing system pressure.
Be sure to remove the plug from the outlet before touching electrical parts. Even if the refrigerator is turned off with a button, the risk of electric shock remains. Also check that the floor under your feet is dry and that the lighting is sufficient for working with small parts.
Removing the protective casing and accessing the compressor
The process of removing the relay begins with gaining access to the bottom of the refrigerator where the compressor is located. The design may differ depending on the brand: in some models (Stinol, Omb) the compressor is completely open, in others (LG, Samsung) it is closed with a metal or plastic casing.
If the casing is present, it must be removed. It is usually secured with 4 bolts in the corners or snapped onto clips. Carefully unscrew the bolts without using excessive force to avoid stripping the threads. Metal casings may have sharp edges, so wear gloves.
After removing the cover, you will see a black “barrel” of the compressor. At its end or side there is a plastic box - this is start-protective relay. Three wires are connected to it (phase, neutral, ground) and it is placed directly on the terminals of the motor windings.
☑️ Preparation for dismantling
Before removing the relay, it is strongly recommended to photograph the location of the wires. Color coding may not comply with standards, and it is very easy to mix up the contacts during assembly. The photo connection diagrams will become your insurance.
How to remove an old relay: step-by-step instructions
The most critical stage is the physical removal of the faulty part. The start relay is attached to the compressor terminals quite tightly, but without using force. The main thing here is the correct sequence of actions.
First you need to remove the terminal block, if there is one, or disconnect the wires. In some models, the wires are inserted directly into the relay body and secured with clamps. Gently pry the clamps with a flathead screwdriver and pull the wires out. Do not pull on the wires themselves, hold on to the insulation or connectors.
Then remove the metal retaining clip. It can be spring or screw. If the bracket is spring-loaded, it needs to be slightly pressed and removed. After this, take the relay body with both hands and with rocking movements (left and right) pull it off the compressor terminals.
- 🖐️ Fix the compressor with your hand so as not to damage the copper tubes when removing.
- 🔄 Remove the relay strictly perpendicular to the terminals, without loosening them up and down.
- 👀 Inspect the terminals for oxidation or carbon deposits - they need to be cleaned.
If the relay is sitting very tightly, you can use light rocking. Never use pliers to remove the relay from its terminals, as this may break the ceramic insulators or damage the windings. If you cannot remove it by hand, it is better to carefully pry the housing with a flat screwdriver in the places where it contacts the compressor.
⚠️ Attention: The compressor leads are very fragile. If too much force is applied, they can break off, requiring replacement of the entire compressor or complex soldering. Proceed carefully and without jerking.
Diagnostics and performance check
Before installing a new part, you should make sure that the problem was in the relay, and also check its condition. Visual inspection often provides 90% of the information. Shake the relay near your ear: if it rattles inside, it means the core or contacts have fallen apart - the part is definitely a replacement.
For a more accurate check, you can use a multimeter. Switch the device to continuity or resistance measurement mode. Check continuity between contacts. If the resistance is infinitely large or, conversely, zero (short circuit) where it should not be, the relay is faulty.
Also check the thermal protection (bimetallic strip), which is often built into the relay housing. It should “ring” (show contact) when cold. If the circuit is broken, the protection has worked and has not returned to its original state, or has burned out.
| Fault type | Symptom | Action |
|---|---|---|
| Open circuit | The multimeter shows infinity | Replacing the relay |
| Sticking contacts | Resistance is close to 0 Ohm constantly | Replacing the relay |
| Mechanical wear | Rumbling inside the case when shaking | Replacing the relay |
| Fusing the case | Deformation of plastic, burning smell | Replacing the relay and checking the wiring |
If visually the relay is intact, but the refrigerator does not work, try to carefully clean the contacts inside (if the design allows) with alcohol. However, given the low cost of the part, replacing a refrigerator relay a new one is a more reliable and economically feasible solution than repairing an old one.
Installing a new relay and assembling
Installing a new starting relay is done in the reverse order removal Make sure you purchase the exact same model. Relays may differ in connection type, orientation (vertical, horizontal) and set of contacts. The markings on the case (for example, PTM-1, RAT, RT) must match.
Place the new relay onto the compressor terminals. It should fit tightly, without any play. Orientation is important: usually the "UP" marking should be facing up in order for the thermal protector to respond correctly to heat. Incorrect installation can lead to false protection activations.
What happens if you mix up the contacts?
If you mix up phase and zero, in most cases the relay will work, since the inductor is insensitive to polarity. However, if a third ground contact or a specific protection circuit is involved, the refrigerator may not start or trip the RCD. Always check the diagram on the new relay.
Connect the wires according to the photograph taken earlier. Make sure that each wire is inserted all the way into its connector. If screw terminals are used, tighten them securely, but not fanatically, so as not to break the core.
After connecting, reinstall the fixing bracket and put on the compressor protective casing. Check that all elements are securely fastened. Now you can turn on the refrigerator.
When you turn it on for the first time, listen to the operation of the motor. It should start with a characteristic hum, the relay may make one quiet click (disabling the starting winding), after which the refrigerator should operate smoothly, without periodic on and off.
Frequently asked questions and possible problems
Even if you follow the instructions, nuances may arise. For example, after replacing the relay, the refrigerator started, but after an hour it stopped freezing again. This may indicate a freon leak or a malfunction of the thermostat, and not an error in replacing the relay.
Sometimes users ask if it is possible to install a relay from a different model. Short-term - possible if the seats and currents match. But for continuous operation, it is better to use original spare parts or high-quality analogues recommended by the manufacturer Whirlpool, Beko or Haier.
If the new relay immediately burns out or knocks out the plugs, then the problem is deeper: most likely, the insulation of the compressor windings is broken (“short circuit to the housing”). In this case, professional rewinding or replacement of the compressor is required.
Remember that the compressor warranty can be voided with independent intervention if traces of tampering with seals or mechanical damage caused by inept actions are found.
Is it possible to repair an old relay if it burned out?
Theoretically, you can clean the contacts or replace the thermocouple, but the service life of such repairs is extremely short. There are calibrated elements inside the relay, and makeshift repairs do not guarantee safety. The cost of a new relay is low, so repairing the old one is not economically feasible.
Why does the relay heat up during operation?
Slight heating of the relay body is normal, since current passes through it. However, if the case becomes too hot (burns your hand), this may indicate poor contact in the terminals, the compressor is overloaded, or an incorrectly selected relay (wrong current).
How often do you need to change the starting relay?
The relay does not have a specific service life and is replaced only after a breakdown. High-quality parts last 5-10 years or more. Frequent replacements may indicate problems with the electrical network in the house (voltage surges) or unstable operation of the compressor itself.
Is a universal relay suitable for any refrigerator?
Universal relays exist, but they require correct settings or have a limited range of application. It is better to select a relay according to the catalog number or exact parameters (starting current, compressor type) to avoid problems with starting the engine.