Faulty temperature sensor is one of the most common problems faced by owners of domestically produced household appliances. If your Biryusa refrigerator stops turning off, works without interruptions, or, conversely, does not start the compressor, in most cases the thermostat is to blame. This small part is responsible for maintaining a given temperature regime inside the chambers, opening and closing the electrical circuit depending on the temperature readings.
Independent replacement of this element is quite possible for a person who knows how to hold a screwdriver in his hands and follows basic safety rules. Thermoregulator (or thermostat) is a consumable item, and its resource is limited by the number of compression and release cycles of the contact group. In this article we will analyze the diagnostic process, selection of an analogue and the step-by-step procedure for installing a new temperature controller in various models of Biryusa refrigerators.
Before starting any work, it is necessary to completely turn off the power to the unit. Unplug the power cord from the outlet and leave the device turned off for at least 15-20 minutes. This will allow the capacitors to discharge and the refrigerant to partially settle, reducing the risk of a short circuit if the wiring is accidentally damaged. Remember that working with electrical appliances requires caution and attention to detail.
⚠️ Attention: If you see traces of burnt insulation, melted plastic on the thermostat body, or smell a persistent burning smell, do not simply try to replace the part. Such signs may indicate more serious problems with the wiring or compressor that require professional diagnostics.
Diagnostics of a thermostat malfunction
Before disassembling the refrigerator and buying new spare parts, you should make sure that the problem lies in the thermostat. There are several characteristic signs indicating failure of this unit. The most obvious symptom is that the compressor works continuously, without going into rest mode, even if a “coat” of ice has formed inside the chamber. In this case, contact group could “stick” in the closed state.
The opposite situation, when the motor does not start at all, can also be caused by a malfunction of the thermostat. If when you turn the knob to the extreme position (maximum cold) you do not hear a characteristic click, this is an alarming signal. However, it is worth checking other elements of the circuit to prevent damage to the starting relay or the engine itself.
For an accurate check, you can use a multimeter in continuity mode. At room temperature, the contacts of most thermostats are closed. If the device shows an open circuit, the part is faulty. You can also experiment with immersing the sensitive tube in cold water with ice, but this requires partial disassembly of the unit.
- 🧊 The compressor hums constantly, the temperature in the chamber drops below normal, the food freezes.
- 🔇 Complete lack of response to turning the adjustment knob, no start clicks.
- 🌡️ The temperature in the chamber does not drop to the required values, the operating cycle is too short or absent.
Choosing the appropriate thermostat model
Refrigerators Biryusa are equipped with different types of thermostats depending on the year of manufacture and the specific model. Most often, mechanical regulators produced by companies TAM, K-59, K-50 or domestic analogues TAM-112, TAM-133 are used. It is important to understand that they are not always interchangeable without modifications, since they may differ in the length of the capillary tube, operating temperature range and mounting method.
When purchasing a new part, be sure to pay attention to the markings of the old device. The numbers and letters in the model name (for example, K-59-L1102) are not random: they indicate the temperature range for turning on and off, as well as the length of the sensing element. Installing a thermostat with an inappropriate range will lead to incorrect operation: either the refrigerator will often turn off or will not be able to reach the desired temperature.
Pay special attention to the length of the capillary tube. If the new tube is too long, it can be carefully rolled into a ring and secured inside the housing, but in no case should it be kinked or damaged. If the tube is shorter than the original, this can become a critical problem, since the sensitive element may not reach the temperature control zone.
| Marking | Refrigerator type | Tube length (approximately) | Temperature range |
|---|---|---|---|
| TAM-112 | Single-chamber | 0.75 m | -12...-20°C |
| TAM-133 | Double-chamber | 0.75 m | -24...-32°C |
| K-59 | Universal | Different | Depends on the index |
| TAM-125 | Freezer | 1.3 m | -36...-48°C |
Where can I find the marking?
The marking is usually applied to the metal body of the thermostat or to the plastic handle. In some cases, it may be erased by time, then you need to look for the number on the tag of the refrigerator itself and select an analogue from the spare parts catalog.
Preparation of tools and workplace
To successfully replace the thermostat, you will need a minimum set of tools. The main thing is to ensure good access to the inside of the refrigerator and sufficient lighting. The work will have to be careful, since the plastic elements of old refrigerators can be fragile from time and low temperatures.
You will need Phillips and flat-head screwdrivers for dismantling panels, pliers for working with terminals and, possibly, a knife for stripping wires. Don't forget to prepare a container for defrosting if you have to touch the evaporator during the process. It is also recommended to have electrical tape or heat shrink on hand to insulate the connections.
☑️ What you need to prepare
Free up space in front of the refrigerator. You will need to move it away from the wall to have access to the back if the design allows for the thermostat to be mounted externally, or simply to provide convenient access to the door. Cover the floor with a rag, as water may drain during defrosting.
Removing the old thermostat
The process of removing the old regulator depends on the design of your refrigerator Biryusa. In most modern models, the thermostat is located inside the refrigerator compartment, behind a plastic panel or directly under the adjustment knob. In older models, it can be located outside, above the door or in a special casing.
If the thermostat is inside: carefully remove the plastic cover from the temperature control knob. Often it is held on by latches or a screw hidden under a decorative plug. After removing the handle, you will have access to the mounting screws of the thermostat itself. Unscrew them and carefully pull the assembly towards you.
It is important to remove the capillary tube correctly. It passes through a hole in the chamber wall and can be secured with clips or simply inserted into a groove. Pull it out smoothly, without jerking, so as not to damage the thin-walled tube and not to break the tightness of the system. If the tube is stuck, you can slightly warm the outlet with a hairdryer, but very carefully.
⚠️ Attention: The capillary tube is filled with freon or inert gas under pressure. It is strictly forbidden to bite, squeeze or puncture the tube. Damage to the tube makes the thermostat unusable, and in rare cases can lead to the release of the contents.
After removing the sensing element, proceed to disconnect the wires. Before doing this, be sure to take a photo of the connection diagram or sketch it, so as not to confuse the colors when installing a new element. Usually the terminals are simply removed by hand or with a thin screwdriver, but sometimes they can oxidize and require careful loosening.
Installation and connection of a new thermostat
Installation of a new one thermostat is carried out in the reverse order of dismantling. First of all, it is necessary to install the capillary tube. Carefully insert it into the hole in the wall of the refrigerator compartment, pushing it all the way or until it reaches the mark, if there is one on the body of the old thermostat. The length of the immersion part must strictly correspond to the original.
Fix the thermostat housing in its original place using screws. Make sure it fits snugly and does not wobble, as vibrations from the compressor can loosen the mount over time. After fixing the case, proceed with the electrical connection.
Connect the wires to the contact group of the new thermostat, focusing on the photographs or recordings taken earlier. The color coding of wires in Biryusa refrigerators is usually standard, but it is better to double-check the diagram. The terminals should fit tightly, without play. If the old terminals are damaged or oxidized, replace them with new ones using a crimping tool.
- 🔌 Insert the wires into the terminals until there is a characteristic click or a tight fit.
- 🧩 Check the secure fit of each wire by lightly pulling on the insulation (not the wire!).
- 🧹 Make sure that the wires do not touch moving parts or hot elements (if there are any nearby).
After connecting the electrical part, reinstall the plastic panel and adjustment knob. Make sure the handle rotates freely and does not touch the body. Reassemble all decorative elements in the reverse order.
Setup and initial startup
After assembly, you can plug in the refrigerator. Do not expect instant results: the compressor and system will take time to reach operating mode. During the first hour of operation, listen carefully to the unit. It should turn on, work for a certain time and turn off.
For initial settings, turn the thermostat knob to the middle position. Let the refrigerator run for 5-6 hours without loading food. During this time, the system stabilizes. If after 40-50 minutes of continuous operation the compressor does not turn off, try turning the knob towards lower values (warmer).
The ideal operating cycle of a working Biryusa refrigerator at normal load is approximately 10-15 minutes of work and 20-30 minutes of rest. If the intervals are very different, additional adjustment may be required with the screw on the thermostat itself, but it is better to entrust this to a specialist, since the adjustment range there is very narrow.
⚠️ Attention: Technical characteristics and location of components in different models of Biryusa refrigerators may vary. Always check the product data sheet or technical documentation for a specific modification, as manufacturers may make changes to the design without prior notice.
Common errors during replacement
When making repairs on their own, beginners often make typical mistakes that nullify all efforts. One of the most common is incorrect positioning of the capillary tube. If it does not fit tightly to the evaporator or is not inserted all the way, the thermostat will “lie” by reading the temperature of the air in the chamber, and not the temperature of the cooling element.
Another mistake is ignoring the state of the wire insulation. Old wires may have microcracks, which, when vibrated, will lead to a short circuit. Also, do not twist wires without using clamps or high-quality soldering, since twisting quickly oxidizes under conditions of humidity and temperature changes.
Sometimes users forget to check the grounding. The refrigerator body must be grounded, and the thermostat is often connected to metal parts. Violation of the insulation can lead to the appearance of potential on the housing, which is life-threatening.
What to do if the refrigerator does not turn off after replacement?
If a new thermostat is installed and the compressor hums without stopping, the temperature range may be selected incorrectly (the thermostat is too “cold”) or the capillary tube is not in contact with the evaporator. It is also worth checking the tightness of the door - the suction of warm air causes the equipment to work in increased mode.
Is it possible to install a thermostat from another manufacturer?
Yes, you can, if the overall dimensions, length of the capillary tube and temperature range match. Chinese analogues (for example, WDF or K-59) are often suitable instead of the original ones THERE, but require careful selection according to labeling.
Why, after replacing the thermostat, the refrigerator became more frequent turn on?
This may be due to the fact that the new thermostat has a narrower hysteresis range (the difference between turning on and off). Also check whether the tube fits tightly to the evaporator. If the contact is bad, the sensor reacts late.
Is it necessary to refill the refrigerator with freon when replacing the thermostat?
No, it is not necessary. The thermostat is an electrical device with a sealed sensing tube that is not connected to the refrigerant circuit. The cooling system remains sealed and no intervention is required.
How to understand that the thermostat is “stuck”?
If when you turn the knob to the “0” (off) position, the compressor continues to work, it means that the contacts inside the thermostat are welded or stuck in a closed state. In this case, the part must only be replaced.
How long does the thermostat in the Biryusa refrigerator last on average?
The average service life of a high-quality thermostat is from 5 to 10 years. However, frequent power surges and constant temperature fluctuations can shorten this period. Preventive replacement every 7–8 years will help avoid sudden spoilage of products.