A sudden increase in temperature in the refrigerator compartment or, conversely, excessive freezing of food often indicates a malfunction of the temperature control system. If your Biryusa refrigerator stops maintaining the set mode, and the compressor works without interruption or does not turn on at all, there is a high probability of the thermostat failure. This part is responsible for turning the motor on and off depending on the temperature inside the chamber, and its failure can lead to spoilage of food or burnout of the compressor itself.
In most cases, replacing the regulator is a procedure that can be performed independently with a minimum set of tools and basic electrical skills. Thermoregulator (or thermostat) is a mechanical or electronic device that reads readings from a capillary sensor and opens the electrical circuit when the desired degrees are reached. Understanding the principle of its operation will help you not only replace the part, but also configure it correctly after installation, avoiding repeated calls to the technician.
In this article we will analyze in detail the stages of diagnostics, selection of compatible spare parts and direct replacement of the regulator on models Biryusa of various years of manufacture. You will learn how to safely dismantle the old unit, what to pay attention to when connecting wires, and how to check the tightness of the new system. It is important to act consistently so as not to damage fragile controls and maintain the warranty on new components.
Diagnostics of thermostat malfunction
Before you start disassembling the unit and purchasing new spare parts, you need to make sure that the problem lies in the thermostat, and not in a freon leak or a compressor malfunction. The main sign of a breakdown thermostat is incorrect operation of the motor: it either hums continuously, without turning off even when the chamber is very cool, or is silent, despite the fact that it is already warm inside. It is also worth paying attention to the condition of the products: if everything is melting in the refrigerator compartment, and there is ice in the freezer, or vice versa - everything is covered with frost, this is a sure signal to check the sensor.
For the initial check, you can use the method of visual inspection and “testing” the contacts if you have a multimeter. However, there are also indirect signs that indicate the need for replacement. For example, if the regulator knob turns too easily, without characteristic clicks, or if the capillary tube has visible damage and swelling, then the part definitely requires replacement. Sometimes the problem lies in the oxidation of contacts inside the unit itself, which leads to unstable operation of the entire system.
⚠️ Attention: Before any diagnostics, and especially disassembling the refrigerator, be sure to disconnect it from the power supply! Working with live electrical appliances is deadly and can lead to electric shock.
If you notice that after defrosting the refrigerator began to work normally, but after a few days the situation repeated itself, this may also indicate sticking thermostat contacts. In some cases, lightly tapping the regulator body helps, which temporarily restores contact, but this is only a short-term measure. For a long-term solution to the problem, you will need a complete replacement of the unit new one.
Necessary tools and selection of spare parts
To successfully replace the regulator, you will need not only a new part, but also the right tool. You should not try to carry out repairs “by eye” or using improvised means, as this can lead to damage to the plastic elements of the case or poor contact in the electrical circuit. The basic set includes Phillips and flathead screwdrivers, pliers, and a multimeter for checking the circuit. Some models Biryusa may need hex keys to remove decorative panels.
Choosing the right thermostat is a critical step, since different models of refrigerators require devices with different temperature response ranges. Installing the wrong regulator will result in the chamber either being undercooled or the food freezing. When purchasing, pay attention to the markings: often they coincide with the original, but there may also be analogues from other manufacturers, such as Tam, Danfoss or K59. It is important that the length of the capillary tube and the type of fastening correspond to your model.
Below is a table with popular models of thermostats and their compatibility with the Biryusa series of refrigerators, which will help you navigate when ordering spare parts in the store:
| Thermostat marking | Type applications | Temperature mode (on/off) | Compatible Biryusa series |
|---|---|---|---|
| TAM-133 | Single-chamber | -12...-20 / +3...+10 | Biryusa 6, 8, 10, 14 |
| K-59 L1275 | Two-chamber (cold chamber) | -24...-6 / +3...+10 | Biryusa 133, 355, 495 |
| TAM-145 | Freezers | -24...-15 / -10...-5 | Biryusa chest freezers |
| K-50 L1950 | Single-chamber | -20...-5 / +3...+10 | Old Biryusa models |
When purchasing a part, be sure to check the integrity of the packaging and the absence of physical damage to the case itself. The capillary tube should not have kinks or cracks, since even microscopic damage will lead to leakage of sensitive liquid and inoperability of the device. If you are in doubt about the choice, it is better to remove the old regulator and go to the store with it to compare the seats and the length of the rod.
Removing the old temperature controller
Removal process troubleshooting a faulty thermostat begins with providing access to it. In most refrigerator models Biryusa the thermostat is located inside the refrigerator compartment, often hidden behind a plastic panel or located in the lighting control unit. First, you need to empty the chamber of food and completely defrost the unit, if there is ice on the walls, so that water does not get on the electrical contacts during disassembly.
Next, you should carefully remove the temperature control knob. It may be held by friction or have a hidden locking screw. After removing the handle, access to the fastening elements opens. In some models, the regulator itself is inserted into a hole in the chamber wall and secured with a decorative plate, which must be pryed off with a flat screwdriver. Be careful, the plastic on old refrigerators can be fragile and brittle from time and cold.
After removing the decorative elements, you will have a view of the electrical part. Here it is important to remember or photograph the wiring diagram. Typically, several wires go to the contacts of the thermostat: phase, neutral and ground, as well as wires going to the compressor and fan (if any). Before disconnecting the wires, make sure that the refrigerator is unplugged. Carefully pull back the terminals or unscrew the screws securing the wires and remove the old regulator along with the capillary tube.
☑️ Preparation for dismantling
The capillary tube can be fixed in the channel of the refrigerator wall or simply pressed clips. When removing, be careful not to forcefully pull on the tube itself, so as not to damage the internal channel or deform the tube if you plan to use it as a sample for purchasing a new one. If the tube is frozen into the insulation, you can carefully warm the outlet with a hairdryer at a low temperature, but not with an open fire.
Installing and connecting a new thermostat
Installing a new one thermostat is done in the reverse order of dismantling. First, the capillary tube must be positioned correctly. Its sensing element must be tightly fixed in a special hole on the evaporator or in a channel in the wall of the refrigerator compartment in order to accurately read the temperature. If the tube dangles in the air inside the chamber, the readings will be incorrect and the refrigerator will not work properly. Use standard clamps or clips to fix the
Electrical connection requires special care. The wires must be connected strictly in accordance with the previously taken photograph or diagram. Usually the contacts are marked with numbers or letters, but the color marking of the wires may vary from manufacturer to manufacturer. The main thing is to ensure reliable contact in the terminals so that when the compressor vibrates, the connection does not loosen, which can lead to sparking and heating.
⚠️ Attention: Do not allow moisture to get on the contacts of the thermostat and compressor. Condensation or water can cause a short circuit immediately after turning on the device.
After connecting the wires, carefully place them in the grooves provided for this purpose so that they do not touch moving parts (if there is a fan) or hot surfaces. Place the thermostat housing in place, secure it with screws or snap on the decorative trim. Make sure that the regulator rod protrudes evenly and that the handle fits onto it tightly, without any play. Only after complete assembly can you proceed to testing.
What to do if the wires are not the right length?
If the wires of the new thermostat are shorter than required, do not force them under any circumstances. You can carefully extend the wires using special connecting sleeves and heat shrink, observing electrical safety rules. However, it is better to try to find a model with a similar length or arrangement of contacts.
Setup and first launch of the system
After completion of installation work, the stage of setup and first launch begins. Don't expect instant cold: the compressor will take time to gain speed and start cooling, especially if there is some old oil left in the system or the freon has not yet been distributed evenly. Turn on the refrigerator and set the control knob to the middle position (usually number 3 or 4 on the scale).
The first cycle of operation can be long. Compressor it can work for several hours in a row until it reaches the set temperature. This is normal for the initial startup after replacing the thermostat. Make sure that the door is tightly closed and that warm food does not get inside, which will increase the load on the system. After a few hours, check the temperature in the chamber using a thermometer.
If the temperature is not at the set temperature, additional adjustment may be required. On some models of thermostats there is an adjustment screw under the handle, the rotation of which allows you to shift the response range. However, if you are using a high-quality analog or original spare part, the factory settings should be sufficient for normal operation. Rotate the adjustment screw only in small steps (no more than 1/4 turn) and wait for the temperature to stabilize.
Typical replacement errors and their consequences
Even with instructions, beginners often make mistakes that can negate all efforts or lead to new breakdowns. One of the most common mistakes is incorrect installation of the capillary tube. If it does not fit tightly to the evaporator or is installed in the wrong place, the thermostat will “lie” and the refrigerator will either not turn off, overloading the motor, or will often turn off without having time to cool the food.
Another common mistake is poor contact in electrical connections. Loose screws or loose terminals lead to heating of the contact point, melting of the insulation and, in the worst case, a fire. Always check that the wires are securely fastened by lightly tugging them (with the device unplugged, of course). Also, do not ignore grounding if it is provided for in the design of your model Biryusa.
Sometimes users forget to check the integrity of the door seals after repair. If the door does not close tightly, warm air will constantly flow in, causing the thermostat to keep the compressor on all the time. In this case, replacing the thermostat will not solve the problem, since the reason lies not in the electrics, but in the thermal insulation. Make sure that the rubber seal is clean, elastic and fits tightly around the entire perimeter.
Is it possible to replace the thermostat with an analogue with a different marking?
Yes, you can, if the parameters of the new regulator (temperature range, rod length, type of fastening) match the original. The main thing is that the on and off points meet the requirements of your camera.
Why does the refrigerator make strange noises after replacement?
The new thermostat may make clicking noises when switching - this is normal. If the compressor is humming louder than usual, it may be working overtime to increase temperature. If the sounds are unusual (gurgling, whistling), check the fastening of the tubes.
How long does a new thermostat last?
The average service life of a high-quality thermostat is 5-10 years. However, this period may be shortened with frequent power surges in the network or sudden changes in room temperature.
Do you need to refill the refrigerator with freon after replacing the thermostat?
No, replacing the thermostat does not affect the refrigeration circuit if you did not damage the capillary tube or evaporator during installation. The system remains sealed and refilling with freon is not required.
What to do if the new regulator does not click?
If the thermostat does not make clicks when you turn the knob and the temperature does not change, you may have received a defective copy or a model not designed to operate in this temperature range. Check the functionality with a multimeter.