Faced with the fact that your Nord refrigerator stops freezing or hums but does not start, owners are often faced with the need to diagnose the trigger mechanism. The compressor is the heart of the unit, and the relay is its starter, and this is where the troubleshooting begins. In most cases, the problem lies in sticking of contacts or burnout of the winding, which requires a visual inspection of the part.
The process of dismantling the protective box and the relay itself does not require complex professional equipment, but does imply strict adherence to safety precautions. Improper handling of electrical components may result in electric shock or damage to the compressor. In this article, we will look in detail at how to properly and safely remove the cover in order to diagnose or replace the unit.
Before starting work, you must make sure that the device is completely de-energized. Unplug the power cord and move the refrigerator away from the wall, allowing easy access to the back wall. Any manipulations with the electrical part are carried out only when there is no voltage in the network.
Preparation of the workplace and necessary tools
To successfully complete the task of dismantling the compressor protective casing, you will need a minimum set of tools that can be found in every home. The main tool will be flat-head screwdriver, preferably with a thin tip, in order to carefully pry up the plastic latches without the risk of damaging the case. You may also need a Phillips screwdriver if the cover is secured with screws, which is typical for older models.
It is important to prepare the surface for work so as not to lose small fasteners. Cover the floor with cardboard or prepare a container for storing screws. The light should be bright enough, since the bottom of the refrigerator is often dark, and you will need to carefully examine the condition of the contacts and markings of parts.
⚠️ Attention: Before starting work, be sure to wear protective gloves. The metal edges of a compressor or a cooled capacitor may have sharp edges, which can easily injure you during the dismantling process.
It would be a good idea to prepare a multimeter for the initial continuity test if you plan to not only remove the cover, but also check the serviceability of the relay. However, for the removal process itself, it is enough to have only a screwdriver and a flashlight on hand. Make sure there is enough room for maneuver around you.
☑️ Preparing to remove the cover
Access to the compressor and removal of the protective panel
The compressor in refrigerators Nord is located in the lower rear part of the case and is covered with a metal or plastic panel. This panel protects mechanical parts from dust and accidental damage, and also directs air flow to cool the motor. To get to the relay, this obstacle must be removed.
Depending on the model of your refrigerator, the panel fastening may differ. In modern series, self-tapping screws are most often used, which can be easily unscrewed with a Phillips screwdriver. On older models, the panel may be held in place by latches or guides, which require careful bending of the edges.
After removing all visible screws, do not yank the panel sharply. Run your finger around the perimeter, checking for hidden latches. Carefully remove the casing and set it aside, being careful not to touch the condenser tubes, which may be hot if the refrigerator has been running recently.
Now you have a view of the motor-compressor. Pay attention to the condition of the tubes and wires. If you see traces of oil or obvious damage to the insulation, this may indicate a more serious problem than just a faulty relay. A visual inspection at this stage can save time on further diagnostics.
Design of the starting relay and its location
Starting relay in refrigerators Nord is a compact unit that fits directly onto the three contact pins coming out of the compressor housing. This unit is responsible for starting the engine and protecting it from overloads. On top or on the side, this mechanism is often covered with an additional plastic cover or a metal clamp.
The relay cover performs the function of fixation and protection from moisture and dust. It can be made in the form of a separate cap or be part of a common casing. Inside, under the cover, there is the relay itself, which can be a posistor or induction, depending on the year of manufacture of the model. PTC relays are considered more reliable and modern.
In order to remove the cover, you need to understand the principle of its fastening. Most often, it is held in place due to the tightness of the fit and plastic ears. Sometimes a metal clamp is used for fixation, which must be carefully unclenched or removed. You need to act without excessive effort so as not to crumble the old plastic.
| Type of fastening | Tool | Removal features |
|---|---|---|
| Plastic latches | Flat screwdriver | Pry gently on both sides |
| Metal clamp | Pliers | Squeeze the ears of the clamp without deforming it |
| Tight landing | Hands | Rock from side to side |
| Screw connection | Phillips screwdriver | Unscrew the screw while holding the cover |
Step-by-step instructions: how to remove the relay cover
The dismantling process begins with disconnecting the electrical wires if they interfere with access to the cover fasteners. Be careful: the wires may be short, so do not pull them too hard. If the cover covers the terminal block, first remove it to gain access to the internals.
If the cover is held on by latches, insert a thin blade of a flathead screwdriver into the gap between the main part of the relay and the cover. Turn the screwdriver slightly to release the latch. Repeat the procedure on all sides if there are several latches. Old plastic can be fragile, so movements should be smooth.
If the lid is just a tension cap, grab its edges and pull up with light rocking movements. Don't use jerks. If the cover cannot be removed, it may be fixed with a hidden screw or stuck due to temperature - in this case, you can slightly warm it up with a hairdryer, but very carefully.
After removing the cover, you will have access to the contact group and the trigger itself. Inspect the inside of the cover for melting or signs of sparking. The presence of black carbon deposits indicates poor contact, which could cause the breakdown.
⚠️ Attention: If you find traces of moisture or condensation inside the cover, dry the assembly thoroughly before reassembling. Moisture inside the electrical connection can cause a short circuit when turned on.
Diagnostics and checking contacts after removal
By removing the cover, you are able to carry out an initial visual diagnosis. First of all, pay attention to the condition of the contacts. They must be clean, free of oxides and soot. If the contacts are blackened, they can be carefully cleaned with fine sandpaper or a file, but this is a temporary measure.
Check the integrity of the plastic relay housing. Cracks or chips may indicate mechanical damage or overheating. Also inspect the wires for chafing. Often the problem lies not in the relay itself, but in a break in the wiring that goes to it.
If no visual defects are found, a continuity test with a multimeter will be required. Switch the device to resistance measurement mode. Check the circuit between the contacts. For posistor relays, the resistance in a cold state should be within normal limits (usually several tens of Ohms), and when heated, it should go to infinity.
How to check a posistor without a multimeter?
Visually inspect the ceramic element inside the relay. If it has cracks, chips, or crumbles, the part is definitely faulty. You can also gently shake the relay: if something dangles inside, it means the element is destroyed.
Frequent errors during dismantling and assembly
One of the most common mistakes is the use of excessive force. Owners often confuse latches with a monolithic fastening and break the plastic elements. If the cover does not give in, it is better to study the design again or find a diagram of a specific model Nordrather than risk the integrity of the assembly.
The second mistake is ignoring the markings of the wires. Before removing the relay, many people forget to mark which wire is connected where. As a result, during assembly you have to guess what is causing the compressor to malfunction or burn out. Always take a photo or mark the wires with a marker.
The third mistake is hastily assembled. Loose latches or a poorly installed cover can cause the relay to hang loose on the compressor. Vibration from a running motor will quickly lead to contact separation or damage to the insulation. Make sure that everything fits tightly and securely.
When you need to replace a relay instead of repair
Cleaning the contacts and removing the cover is only the initial stage. If after cleaning the refrigerator continues to operate intermittently, clicks or does not turn on, the relay must be replaced. Repairing modern sealed relays is not economically feasible and technically difficult.
Replacement is necessary if you hear a loud click when starting, followed by a hum, but the compressor does not start. Also a sign of a malfunction is strong heating of the relay housing during operation. In such cases, the new unit will ensure stable operation of the compressor.
When purchasing a new part, pay attention to compatibility. The relay is selected according to the compressor power and the type of refrigerant. The model of your compressor is indicated on a sticker, which is often located next to the relay or on the motor housing itself. Exact matching of parameters guarantees long service life.
Is it possible to remove the cover without turning off the refrigerator?
Absolutely not. Working with live electrical components is fatal. In addition, you can accidentally close the contacts with a tool, which will lead to the compressor or wiring burning out.
What to do if the relay cover is cracked during removal?
If the crack is small, you can temporarily fix it with electrical tape or heat shrink, ensuring protection from moisture. However, it is better to order a new cover or relay assembly, since a violation of the seal leads to oxidation of the contacts.
Where can you find the relay markings on a Nord refrigerator?
The markings are usually applied to the side edge of the plastic relay case itself or on a metal plate adjacent to the compressor. Look for designations like "RT", "RAT", "P3R" and numbers indicating power.
Do the relay contacts need to be lubricated during assembly?
No, you cannot lubricate the electrical contacts in the relay. This will lead to dust accumulation and poor conductivity. Contacts must be dry and clean. If they are oxidized, clean them.
Why does the relay heat up after replacement?
A little heating is acceptable, but if the relay gets hot, perhaps the wrong model was selected or there is a problem with the compressor windings. Also, the cause may be poor contact at the junction of the pins.