If your the refrigerator suddenly stops freezing, and the compressor either hums but does not start, or clicks and goes silent, the reason often lies in a small but critically important element - the start relay. It is this component that is responsible for supplying a starting pulse to the motor windings, allowing the unit to start operating. Understanding where the relay is located in the refrigeratoris the first step towards self-diagnosis and possible repair, which will save the budget on calling a technician.
The location of this part is not accidental: engineers place it in close proximity to the compressor in order to minimize the length of the wires and ensure reliable electrical contact. In most modern and older models, this area is located in the lower part of the case, often hidden from view by a decorative panel. However, despite the similarity of design, the nuances of access may differ depending on the manufacturer and year of manufacture of the equipment.
In this article we will examine in detail the architecture of refrigeration units so that you can accurately determine the location of the starting device. We will discuss how to safely get to the desired unit, what to look for during a visual inspection and what nuances exist for different brands. Attention: any work with electrical appliances requires first disconnecting from the network.
Design features and location of the compressor
To find the relay, you must first understand where the compressor itself is located compressor, since these two elements are inextricably linked. In classic two-chamber refrigerators and Side-by-Side models, the motor-compressor is traditionally located at the lower rear of the unit. This is due to the need for stable refrigerant circulation and ease of maintenance. The relay is mounted directly on the side or end of the compressor housing, covering the terminals of its windings.
There are also models with a so-called “hidden” or built-in compressor, where access to the technical area is limited. In such cases start relay it may be located behind a special removable cover at the bottom of the rear wall or even require partial dismantling of the bottom panel of the refrigerator. In some innovative models, for example, from the brand Liebherr or Bosch, access can be organized through the lower base at the front, which requires removing the decorative grille.
⚠️ Attention: In some models of refrigerators with the No Frost system the compressor group can be partially hidden by a plastic casing, which must be carefully removed by snapping the latches to see the relay.
It is important to note that in two-compressor refrigerators there will be two relays - one for each motor. They can be located symmetrically or be shifted to different corners of the lower niche. If you hear clicking sounds coming from different places, this may indicate problems with both units or the control system. Accurate knowledge of the design of your model greatly simplifies the search.
Algorithm for searching for relays in different models of refrigerators
The process of searching for a starting device varies depending on the brand and design features of the refrigerator. In most cases, you will need to remove the rear metal cover that covers the compressor compartment. It is usually secured with 4-6 bolts or snaps. After removing the protection, you will see the “heart” of the refrigerator - a black cylindrical or pear-shaped compressor.
The relay is a small plastic block (often black, white or gray) placed on the side of the compressor. Wires go from it to the thermostat or electronic control board. In older Soviet-made models, such as ZiL or Saratov, the relay may look like a massive black “tablet” with a radiator. In modern units, this is a compact unit, often combined with a thermal protective switch.
- 🔍 Atlant and Minsk models: The relay is often located on the side of the compressor, covered with a small plastic casing, which is removed by squeezing the side legs.
- 🔍 Indesit and Ariston refrigerators: The starting device is usually located on the left side (when viewed from behind) and is mounted on three pins extending from the motor housing.
- 🔍 Samsung and LG appliances: In these models, the relay is often integrated into the overall system and can be closed by an additional insulation or metal bracket.
- 🔍 Two-compressor systems: Look for two identical black cylinders; relays will be located on each of them, often distinguished by the markings L or R (Left/Right).
When searching, pay attention to the markings. The relay body always contains technical information, including model, voltage and refrigerant type. If you see a part with the inscriptions PZR, RT or CSR, you have found exactly what you were looking for. These abbreviations indicate the type of internal mechanism (positor or electromagnetic).
Types of starting relays and their visuals differences
Understanding what type of relay is installed in your refrigerator helps not only in searching, but also in selecting a replacement. There are two main types of these devices: electromagnetic and posistor (thermal). Electromagnetic relays, which are more often found in older models, operate due to the current passing through the winding and produce a characteristic ringing click when activated. They have a movable core inside the coil.
Posistor relays, which have become the standard for modern technology, operate on the basis of a ceramic element that changes its resistance when heated. They are smaller, more reliable, and have no moving mechanical parts that could jam. Visually, a posistor relay often looks like a small cube inserted into a plastic case, while an electromagnetic one can be more elongated and heavy.
| Characteristics | Electromagnetic relay | Posistor (thermal) relay |
|---|---|---|
| Principle of operation | Electromagnetic induction | Change in resistance when heated |
| Contact location | Vertical (often) | Any (universal) |
| Characteristic sound | Loud click | Quiet click or no sound |
| Sensitivity | Sensitive to voltage changes | More resistant to surges |
During a visual inspection, you should also pay attention to the condition of the case. If you find traces of soot, melted plastic, or smell a burning smell emanating from the part, this is a sure sign that starting relay has failed and requires immediate replacement. Even if the part is externally intact, the internal contacts could oxidize or burn, which is not always visible without opening.
Instructions for safe access to the part
Before touching any internal components of the refrigerator, you must strictly follow the electrical safety rules. The first step should always be to completely unplug the appliance. Simply turning off the button on the case is not enough - you need to remove the plug from the socket. This will eliminate the risk of electric shock and prevent a short circuit if the wiring is accidentally damaged.
You may need to move the unit away from the wall to access the bottom of the refrigerator. Be careful: the refrigerator is heavy and can easily be scratched or damage the floor. It is recommended to work with an assistant or use special furniture runners that are placed under the legs for sliding. After providing access to the rear wall, remove the fastening elements of the protective panel.
☑️ Safe access to the relay
When the cover is removed, do not rush to tear off the relay. Allow the compressor to cool down if it has been running recently, as its temperature can reach 70-80 degrees Celsius. Carefully inspect the area around the motor. Wires can become fragile over time, so avoid sudden movements. If the relay is covered with a plastic cap, it usually needs to be pressed on both sides or removed by sliding it down.
⚠️ Attention: Never try to remove the relay with a jerk or force. It is held on to the compressor terminals and clamps; the wrong force can break the plastic ears or damage the motor terminals.
Diagnostics and signs of malfunction
Once you have reached the relay, you can carry out initial diagnostics. The easiest way is visual and tactile inspection. Shake the relay near your ear: if you hear a rattling sound inside, similar to the clinking of coins or dry parts, then the mechanism is damaged and requires replacement. This is typical for electromagnetic models, where the core could fall out or crack.
Also pay attention to the color of the plastic. Blackening or swelling of the housing indicates overheating and breakdown. If everything is clean on the outside, you can try to ring the device with a multimeter, but to do this you will have to remove it. To check a posistor relay, it is often cooled (for example, in a freezer), since at room temperature it can show infinite resistance, which is the norm for a working element.
The main signs of a malfunction indicating a problem with the relay include:
- 🔊 Characteristic clicks: The compressor tries to start, a click is heard, but the motor does not start, and after a while there is a click repeats.
- 🌡️ Lack of cold: The chambers are warm, the food is defrosting, although the light in the refrigerator is on.
- 🔥 Compressor heating: The motor hums, but does not start, while its body becomes very hot.
- ⚡ Actuating automatic devices: When you turn on the refrigerator, it knocks out the plugs in the apartment.
Why does the relay burn out?
A common cause of failure The starting relay is not the part itself, but problems with the compressor (turn-to-turn short circuit) or power surges in the network. If the compressor is hard to start, it consumes increased current, which leads to overheating and destruction of the relay contacts. Therefore, replacing a relay is often a temporary measure if the root cause has not been eliminated.
Replacement process and key conclusions
If diagnostics confirm a malfunction, the relay must be replaced. To do this, carefully disconnect the wires (after remembering or photographing their location) and remove the old part from the compressor terminals. Installing a new element is done in the reverse order. It is important to choose a relay with similar characteristics, since there are no universal solutions for all models.
When installing, make sure that the relay fits tightly and all the way. Misalignment or misalignment can lead to poor contact and re-burning of the part after a short time. After installation, reassemble everything in the reverse order, plug in the refrigerator and listen: if you hear a confident sound of the motor starting and after 10-15 minutes cold appears in the freezer, the repair can be considered successful.
In conclusion, it is worth noting that knowing where is the relay in the refrigeratorgives you an advantage in quickly solving the problem. However, if after replacing the part the situation has not improved, or you are not confident in your abilities, it is better to turn to professionals. Complex cases may require intervention in the refrigerant circulation system or replacement of the compressor itself.
Frequently asked questions (FAQ)
Is it possible to start a refrigerator without a relay?
Theoretically You can start the motor without a starting relay by giving a start impulse manually or through a button, but operating the refrigerator in this mode is strictly prohibited. This will lead to rapid overheating and burning of the compressor windings, since the working winding will not be able to function normally without the starting winding.
How much does it cost to replace a relay and is it difficult to find a part?
The cost of the relay itself is usually low and varies from 500 to 1500 rubles depending on the model. You can find the part in spare parts stores for household appliances or order it online based on the markings. The difficulty lies in the correct selection of an analogue if the original is discontinued.
Why does a new relay burn out after a week?
If a new relay burns out quickly, then it is not the reason. Most likely, the compressor itself is faulty (interturn short circuit, jammed piston group) or there are problems with the wiring and power surges in the house. In this case, in-depth diagnostics of the motor is required.
Does tilting the refrigerator affect the operation of the relay?
Yes, it does. If the refrigerator stood on its side for a long time or was strongly tilted during transportation, oil from the compressor could leak into the circuit or into the relay itself. Turning on such a refrigerator without settling (at least 4-8 hours, or better yet a day) can lead to water hammer and damage to valves or relays.