A sudden failure of the refrigerator Atlant to turn on or the compressor stops working often signals a failure of the thermostat. This small device is a key element in the engine starting circuit, and its failure makes it impossible for the entire cooling system to function properly. Owners of household appliances are faced with a situation where the motor hums, but does not start, or does not show any signs of life at all, and in most cases the problem lies precisely in this component.
Replacing the thermal relay independently is a very real task for a person who has basic skills in working with power tools and observing safety precautions. Understanding the principle of operation the trigger mechanism allows you not only to save on calling a technician, but also to quickly bring the refrigerator back to life. However
In this article we will analyze in detail the process of diagnosing the fault, the algorithm for selecting the appropriate spare part and step-by-step instructions for installing a new element. You will learn how to properly remove the old relay, what to pay attention to during installation, and how to check the functionality of the system after repair. A competent approach to the matter guarantees long and stable operation of your refrigeration unit.
Symptoms of malfunction and diagnostics of a thermal relay
The first step in repair is to accurately identify the problem. If the refrigerator Atlant stops freezing, and the compressor is either silent or makes a short humming sound followed by a click and turns off, there is a high probability of breakdown of the starting device. Thermal relay (or starting relay) is responsible for supplying voltage to the starting winding of the engine at the time of start and turning it off after a set of revolutions.
For initial diagnostics, disassembling the unit is not always required. Pay attention to the operating cycle: if the engine tries to start, it hums for 3-5 seconds, then there is a click and silence, after which the process repeats after a few minutes - this is a classic symptom. It is also worth checking to see if the compressor housing is overheating in the lower part, which may indicate constant attempts to start and thermal protection.
⚠️ Attention: If you smell burning or see sparking in the compressor area, immediately unplug the refrigerator. Further operation without repair may lead to burnout of the motor windings.
A more accurate check can be carried out by removing the back cover and getting to the compressor. A visual inspection may reveal melting of the relay housing or oxidation of the contacts. However, the most reliable method is to check the resistance with a tester or replace it with a known-good analogue. Starting winding It must receive a pulse strictly at a certain moment, and if the relay does not close the circuit, starting is impossible.
Often users confuse a relay failure with a malfunction of the compressor itself or thermostat. To rule out an error, listen to the sounds: the thermostat clicks when the temperature changes, and the relay clicks when you try to start. If there are relay clicks, but there is no start-up, or there are none at all when the thermostat is running, the problem is in the start-up electrical circuit.
Necessary tools and preparation for work
Before proceeding with the replacement, it is necessary to prepare the workplace and tools. To work with refrigerators Atlant no complex industrial equipment is required, a set of household tools is enough. The main thing is to ensure good lighting and free access to the rear wall of the unit.
You will need the following tools:
- 🔧 Screwdrivers (Phillips and flat) for removing protective covers.
- 🔧 Pliers or pliers for work with terminals.
- 🔧 Multimeter (tester) to check the continuity of the circuit.
- 🔧 Electrical tape or heat shrink to insulate connections.
Preparation also includes defrosting the refrigerator if a lot of ice has accumulated in the chamber, and mandatory disconnection from electrical outlet Safety is priority number one, so make sure the plug is unplugged and the floor under the refrigerator is dry. If the model is built-in, it must be carefully pulled out of the niche.
Free up the space around the refrigerator in advance to be able to move freely. Remove the protective cardboard or metal panel from the back that covers the compressor. Usually it is attached to latches or several screws that can be easily unscrewed.
☑️ Preparation for repair
Selecting a suitable starting relay for Atlant
The spare parts market offers many options, but for refrigerators Atlant it is critically important to select a relay with compatible characteristics. The main parameter is the compressor power and engine type. An incorrectly selected device may not start the motor or, worse, lead to its overheating and failure.
The most common models for equipment of this brand are series relays RT (for example, RT-21X, RT-21K) or their modern analogues from manufacturers like Indesit or Danfoss (now Secop), if they are adapted for Atlanta connectors. There is always a marking on the body of the old relay that must be rewritten before purchasing.
When choosing, pay attention to:
- 🏷️ Rated current and power indicated on the case.
- 🏷️ Location and number of contacts (2 or 3 outputs).
- 🏷️ Installation orientation (some relays only work in a certain position).
If you have not found an original spare part, you can use universal starting relays, which are equipped with a set of adapters for different types of compressors. However, for the durability of the repair, it is better to look for specialized analogues designed specifically for refrigerators Atlant with a specific type of motor.
⚠️ Attention: Universal relays may have a different operating logic. Before installation, carefully check the connection diagram with the instructions for the new product, since the location of the contacts may differ from the original.
Is it possible to use a relay from another refrigerator?
Using a relay from another brand is possible only if the electrical characteristics and mounting dimensions completely match. However, manufacturers often change the internal logic of the bimetallic strip, which can lead to frequent false shutdowns or underheating of the contacts. It is better to look for cross-codes or proven analogues.
Removing an old thermal relay: step-by-step algorithm
The process of removing a faulty element requires care, since plastic relay cases and terminal blocks become fragile over time. After removing the protective cover of the compressor, you will see a black cylindrical or box-shaped element put on the compressor rod or secured nearby.
Sequence of actions for dismantling:
- Take a photo of the original position of the wires and contacts so as not to get confused during assembly.
- Carefully disconnect the wire terminals going to the relay. Do not pull the wires, hold on to the terminals themselves.
- If the relay is mounted on the compressor rod, it should be removed with a slight rocking movement. Sometimes it is fixed with a bracket or spring that needs to be pressed out.
- Disconnect the relay body from the capacitor (if it is built-in or attached nearby) to remove it completely for inspection.
When removing, pay attention to the condition of the contacts. If they turn black or melt, this confirms the diagnosis. Also check the integrity of the wires: the insulation should not be damaged. Capacitorwhich is often paired with a relay, it is also worth checking for swelling or electrolyte leakage.
In some models Atlant the relay is mounted on a frame, which, in turn, pressed against the compressor. In this case, the frame is first removed, and then the wires are disconnected. Do not use excessive force to avoid damaging the copper tubes of the compressor.
Installation of a new element and connection diagram
Installation of a new thermal relay is carried out in the reverse order of dismantling. The key point is the correct orientation of the device. The relay body usually has a marking "UP" (top) or an arrow indicating how it should be positioned relative to the floor. Incorrect installation will result in the gravity mechanism inside not working correctly.
Connect the wires according to the diagram or photograph made earlier. Typically three contacts are used: common, start and working. Make sure the terminals are tight and not loose. If the connectors are loose, they can be carefully tightened with pliers, but without fanaticism, so as not to split the plastic.
Contact correspondence table (standard marking):
| Designation on the diagram | Wire color (often) | Function |
|---|---|---|
| C (Common) | Red / Brown | Common phase input |
| S (Start) | Blue / Green | Start winding |
| R (Run) | White / Black | Working winding |
| GND | Yellow-green | Case grounding |
After connecting all the wires, push the relay onto the compressor rod until it stops. It should fit tightly. If the design requires fastening with a bracket or screw, secure the device. Make sure that the relay does not touch metal parts of the housing or tubes to avoid vibration and noise.
⚠️ Attention: Make sure that the new relay is installed strictly vertically (or as indicated in the instructions), otherwise the internal mechanism will not be able to open the circuit correctly after starting the engine.
Checking functionality and first start
After installation all components in place, but before closing the back panel, it is necessary to carry out a test run. This will ensure that the assembly is correct and there are no short circuits. Plug the refrigerator into the outlet.
In the first seconds, you can hear a characteristic click of the relay, followed by the smooth hum of the operating compressor. If the engine starts and runs stably, without extraneous sounds or vibrations, it means The replacement was successful. Touch the compressor housing after a couple of minutes of operation - it should begin to heat up evenly.
What to do if:
- ❌ The compressor hums and turns off: Check again the orientation of the relay and the tightness of the contacts. The relay may be defective or not suitable for power.
- ❌ You hear a crackling or sparking sound: Turn off the power immediately. There is a bad contact or short circuit somewhere.
- ❌ Silence and no reaction: Check for voltage in the socket and integrity of the fuses in the wiring.
If everything went well, let the refrigerator run for 15-20 minutes without the back cover, monitoring the process. Make sure the temperature in the freezer begins to drop. Only after this can you install the protective panel in place and move the refrigerator to the wall.
Frequent errors and user questions (FAQ)
During self-repair, typical mistakes are often made that can ruin all your efforts. One of the most common is ignoring the orientation of the relay during installation. Another mistake is poor contact in the terminals, which leads to heating and repeated failure. Also, users often forget to check the condition of the capacitor, which, if faulty, can “kill” the new relay in a few minutes.
Below are answers to frequently asked questions that will help avoid mistakes:
Is it possible to temporarily short-circuit the relay to make the refrigerator work?
It is strictly not recommended. A forced start without a relay will result in only one winding running, the motor will overheat, hum and burn out within a short time. This is an emergency measure for diagnostics, but not for operation.
Why does the new relay click, but the compressor does not start?
This may indicate a malfunction of the compressor itself (jamming, interturn short circuit) or that a relay with incorrect current characteristics has been selected. It is also worth checking the condenser.
Do you need to wait until the compressor cools down before replacing?
Yes, if the refrigerator has just been running, it is better to let it cool for 15-20 minutes. The thermal protection relay may be open and the diagnosis will be incorrect. In addition, hot parts can damage your hands.
How long does a starting relay last on average?
The service life depends on the quality of the voltage in the network and the number of switching cycles. On average, a high-quality relay lasts 5-7 years or more. Frequent power surges significantly reduce this period.
Can a faulty relay damage the compressor?
Yes, if the relay “sticks” in the on state, the starting winding remains energized, which causes rapid overheating and breakdown of the motor insulation. Therefore, at the first signs of unstable operation, it is better not to postpone replacement.
Replacing the thermostat on the refrigerator Atlant is an affordable procedure that extends the life of the equipment by years. Following the sequence of actions, choosing the right spare part and paying attention to detail will allow you to handle the repair yourself. Remember that regular maintenance and careful attention to the sounds of a working unit help prevent serious damage.