The refrigerator is one of the most important household appliances in the house, and its sudden breakdown can become a serious problem for any family. When the appliance stops freezing or the compressor hums but does not start, the start relay is often the culprit. In brand models Nord this element is responsible for supplying voltage to the motor windings, ensuring its starting and normal operation.
Replacing this part yourself is quite possible if you have a minimum set of tools and basic skills in working with electricity. However, before proceeding with dismantling, it is necessary to make sure of the diagnosis, since the symptoms may be similar to a malfunction of the compressor or thermostat itself. Start relay is a small but critical unit that often fails due to power surges or natural wear.
In this article we We will analyze in detail the diagnostic process, selection of a new spare part and the procedure for its installation. You will learn how to safely get to the unit, what nuances the design of compressors has Nord and what to pay special attention to so as not to damage other elements of the system. Correct implementation of all stages will extend the life of your equipment without calling a technician.
Diagnostics of a faulty start relay
The first step in any repair is to accurately determine the cause of the breakdown. If your refrigerator Nord has stopped cooling and the compressor is either silent or making short humming sounds and clicking sounds, these are classic signs of a problem with the starter. Sometimes the motor may try to start, but turn off after a few seconds, indicating that the thermal protection has tripped.
Visual inspection can also provide important clues. If you notice blackening of the plastic on the relay housing or smell a burning smell coming from the back of the unit, the part definitely needs to be replaced. It is also worth listening to the nature of the sounds: a ringing click when turned on and silence indicate that the mechanism does not work.
- 🔍 The compressor hums for 5-10 seconds and turns off with a characteristic click.
- 🔍 Complete lack of reaction from the refrigerator when plugged in, although the light inside is on.
- 🔍 The presence of visible signs of overheating, melting or cracks on the relay body.
- 🔍 Periodic attempts to start the motor with long pauses.
It is important to understand that similar symptoms can occur during an interturn short circuit in the motor windings. Therefore, if after replacing the relay the problem does not disappear, a more in-depth diagnosis will be required using a multimeter to check the resistance of the compressor windings. Thermal relaybuilt into the design may also be faulty, although it is often assembled with the starting mechanism.
⚠️ Attention: If the compressor is hot to the touch and does not start, do not try to turn on the refrigerator repeatedly. This can lead to final burnout of the motor windings and the need to replace the entire unit, which is not economically feasible.
Necessary tools and preparation for work
To successfully replace the relay on the refrigerator Nord no complex professional equipment required. A standard DIY kit is sufficient. The main thing is to ensure the safety of work, since you will have to deal with electric current and refrigerant in the tubes.
Before starting any manipulations, be sure to disconnect the device from the power supply. Unplug the socket and make sure that the back of the refrigerator is clear. If the unit is built-in or stands close to the wall, it will have to be moved, being careful not to damage the floor covering or plastic elements.
☑️ Tools for replacing the relay
You will need the following tools:
- 🛠️ Screwdrivers of various types to remove the protective casing and clamps.
- 🛠️ Multimeter for checking the integrity of contacts and diagnostics.
- 🛠️ Pliers for careful removal of terminals and clamps.
- 🛠️ Flashlight for better illumination of the working area in the compressor niche.
Pay special attention to the selection of new spare parts. Relays for refrigerators Nord may differ in the type of fastening, number of contacts and internal structure (RTK, RT, RSO). The marking of the old relay should match the new part or be indicated in the list of compatible analogues by the manufacturer. Purchase of an unsuitable element can lead to instant failure of the compressor.
Access to the compressor and removal of the protective casing
The compressor in refrigerators Nord is usually located in the lower rear part of the case. It is covered with a metal or plastic casing that protects the motor from dust and mechanical damage, and also directs air flow for cooling. Removing this casing is the first stage of physical access to the unit.
Depending on the refrigerator model, the casing may be secured with screws or latches. Older models often use screws around the perimeter of the lid. Use the appropriate screwdriver to unscrew them. Be careful: the screws may be covered in paint or rust, so do not use excessive force to avoid stripping the threads.
If there are no screws, inspect the perimeter for plastic latches. They need to be carefully pressed out with a flat screwdriver. After removing the fasteners, the casing is removed downwards or to the side, providing access to the compressor, capacitor and start relay. In some modifications Nord it may also be necessary to remove the lower plinth or decorative panel.
| Mounting type | Location | Tool | Removal nuances |
|---|---|---|---|
| Screw | Around the perimeter of the cover | Phillips screwdriver | Screws may oxidize |
| Latch | Bottom and sides | Flat screwdriver | Proceed carefully, the plastic is fragile |
| Combined | Screws + latches | Both types of screwdrivers | First unscrew the screws, then press out |
| Clamp | Around the neck | Pliers | Found on older models |
After removing the casing, you will see a black cylindrical or pear-shaped compressor. A plastic box will be attached to its end or side - this is the starting relay. Wires from the network and from the motor itself are suitable for it.
Removing the old starting relay
The process of removing the relay requires care and accuracy. The part is tightly seated on the compressor terminals, and careless movement can damage the copper tubes or the contacts themselves. First you need to disconnect the wires going to the relay.
Usually the wires are secured to terminals, which can be detachable or require releasing the clamps. Remember or take a photo of which wire is connected where. Color coding is often used, but you should not rely on it alone, since previous craftsmen may have made changes. Carefully remove the terminals, helping yourself with pliers if necessary, but do not pull sharply.
The relay itself is held on the compressor terminals due to a tight fit and is sometimes fixed with a metal bracket or plastic clip. If there is a bracket, it needs to be bent. Then take the relay with both hands (or holding the body with one hand, the relay with the other) and with light rocking movements from side to side, remove it from the contacts. Do not use excessive force vertically up so as not to break off the tubes.
⚠️ Attention: It is strictly forbidden to pull the relay by the wires. This will lead to a break in the cores inside the insulation or torn out terminals, which will create additional problems when restoring equipment.
After removal, inspect the inside of the relay. If black soot, melted plastic or a torn coil is visible there, the diagnosis is confirmed. Also check the condition of the contacts on the compressor itself - they should be clean, free of oxidation and carbon deposits. If there are dirt on the motor contacts, they can be carefully cleaned with fine sandpaper or a file, having first de-energized the device.
Installing a new relay and assembling the system
Installing a new part is carried out in the reverse order of dismantling. Make sure that the new relay is designed to work with compressors Nord and is marked accordingly (for example, RTK-1, RTK-1-3, RSO-1, etc.). It is important to orient the part correctly: there is usually an arrow on the body indicating the direction “Up” or “Top”, which should look straight up.
Carefully place the relay on the compressor terminals. It should fit tightly, without any play. If a retaining bracket is used, return it to its original position. Then connect the wires to the appropriate terminals, following the diagram or color coding you made earlier. Make sure that the connection is secure and the wires are not loose.
What to do if the new relay does not fit in the seats?
In some cases, manufacturers change the design. If the holes do not match, you can carefully bend the metal contacts on the relay itself (if there are any) or use an adapter if it was included in the kit. The main thing is to ensure tight contact with the compressor terminals.
After connecting all the wires, visually check the assembly again. Nothing should touch the hot parts of the compressor or be in close proximity to moving elements (although there are none in the compressor, vibration can play a cruel joke). Make sure there is no tension on the wires.
Now you can reinstall the protective casing. Secure it with screws or latches. Make sure it sits straight and doesn't rattle. Only after complete mechanical assembly can you connect the refrigerator to the network.
Checking operation and possible problems
After turning on the refrigerator Nord to the network, listen. The compressor should start with a characteristic hum, which after a while will become smooth and quiet. The relay should click once upon startup and not make any more sounds. If you hear frequent clicks or the humming is interrupted, immediately turn off the device.
During the first 30-40 minutes of operation, monitor the temperature in the chambers. The freezer should begin to cool. If the cold appears and the compressor operates in normal mode (turns on and off in a cycle), then the repair was successful.
- ✅ The compressor operates smoothly, without vibrations and extraneous noise.
- ✅ The temperature in the chambers decreases according to the settings.
- ✅ Relay does not make repeated clicks after starting.
- ✅ The relay body does not heat up to critical temperatures.
If the refrigerator did not work, perhaps the problem was not only in the relay. Could be a faulty thermostat, a freon leak, or, worst of all, a compressor wedge. In such cases, professional diagnostics are required at a service center.
Is it possible to repair an old relay rather than changing it?
Theoretically, if the problem is stuck contacts, they can be cleaned. However, the design of modern relays (especially posistor relays) does not imply repair. Mechanical relays (RTK) can sometimes be restored, but the service life of the repaired part will be low. Considering the affordable price of new analogues, repairing an old relay is neither economically feasible nor safe.
Why did the relay burn out? Is it necessary to look for the cause?
Frequent causes of failure: power surges in the network, overheating of the compressor due to contamination of the condenser at the back, infrequent use of the refrigerator or, conversely, operation with overload (clogged with food). Before installing a new relay, it is advisable to check the voltage in the network and clean the rear grille from dust.
Where can I find the marking of a suitable relay for Nord?
The marking is on the body of the old part (for example, RTK-1-3, 11502601, etc.). Information can also be found in the technical documentation of the refrigerator or on the nameplate of the compressor itself, where the engine type is indicated. A compatible relay is selected based on the type of engine (ATT, DC, etc.).
Is it dangerous to change the relay yourself?
If you follow electrical safety rules (mandatory disconnection from the network before starting work), the risk is minimal. The main danger is electric shock if you turn on the device during operation, or damage to the compressor tubes if removed carelessly. If you are not confident in your abilities, it is better to call a specialist.