Sudden defrosting of food or, conversely, the transformation of the refrigerator compartment into an ice block are sure signs that thermostat has failed. Refrigerators of the brand Biryusa, popular due to their reliability and affordability, over time also require attention to the temperature control system. If you notice that the compressor works without interruption or does not turn on at all, despite turning the regulator knob, most likely it’s time to replace this important unit.
Replacing the thermostat yourself is a completely solvable task for a person who knows how to handle tools and follows the technique security. This will save a significant amount on calling a technician and quickly bring the unit back to life. In this article, we will analyze in detail the diagnostic process, selection of spare parts and the replacement procedure itself, focusing on the nuances specific to the equipment. Biryusa.
Before starting disassembly, you need to make sure that the problem lies in the thermostat, and not in a freon leak or a malfunction of the start relay. Thermostat is a sensor that closes or opens electrical circuit depending on the temperature inside the chamber. Understanding the principle of its operation will help you avoid mistakes when installing a new element and guarantee a long service life of the refrigerator after repair.
Diagnostics of thermostat malfunction
The first step should always be a thorough check. If the refrigerator Biryusa stops freezing or freezes too much, do not rush to buy spare parts. Rule out other causes first. Pay attention to the operation of the compressor: if it hums constantly and does not turn off, even when you turn the thermostat knob to minimum, this is an alarming signal. Normally, when turning the knob counterclockwise until it clicks, the engine should stop.
There is a simple way to check thermostat without a multimeter, although the device will significantly increase the accuracy of diagnosis. You need to get to the sensor contacts and close them directly. If the compressor starts working after closing, it means that the circuit is working, and the problem is in the sensor itself. However, this method requires caution, since you remove the overheating protection element from the circuit.
A more reliable method is to test the contacts with a tester in resistance measurement mode. At room temperature the contacts should be closed (resistance close to zero). If you place the thermostat sensing tube in cold water (about 0°C) or apply ice to it, the contacts should open and the device will show infinity. Lack of response to temperature changes indicates the need for replacement.
⚠️ Attention: Before any manipulations with electrical components, be sure to unplug the refrigerator! Working under voltage is deadly and can lead to a short circuit.
Selection of an analogue and preparation of tools
The success of the repair largely depends on the correctness of the selected spare part. Thermostats for refrigerators Biryusa may differ in the length of the capillary tube, type of mounting and operating temperature range. The most common models are the TAM, K-59 or K-57 series. It is important to choose an analogue with the same or greater length of the tube, since it cannot be shortened, and the excess length can be carefully laid in coils.
To carry out the work, you will need a standard home craftsman's kit. There is no need to look for specialized equipment, just basic tools that many people have in their garage or toolbox. The main thing is to prepare everything in advance so as not to interrupt the process of searching for a screwdriver.
- 🛠️ A set of screwdrivers (phillips and flat) for removing panels and dismantling the old sensor.
- 🔧 Pliers or pliers for carefully removing the tube from the seat.
- 🌡️ Multimeter for the final check of the contacts of the new thermostat before installation.
- 🧤 Gloves to protect your hands from sharp metal edges and possible residual refrigerant.
When purchasing, pay attention to the markings. The numbers at the end indicate the length of the capillary tube in centimeters. For example, TAM-133-1M-3 has a tube 3 meters long. If you take a thermostat with a shorter tube, it may simply not reach the evaporator, and the refrigerator will not respond correctly to the temperature.
⚠️ Attention: The characteristics of thermostats may vary depending on the year of manufacture and the specific model of the refrigerator. Always check the markings of the old part with the new one or consult with the seller, indicating the exact model of your unit. thermostat in different models Biryusa.
Access to the thermostat in different models
The design of refrigerators Biryusa has changed over the years, so the location of the thermostat may differ. In most modern models, the regulator handle is located inside the refrigerator compartment on the right wall. In older versions or models with a top freezer, the control may be moved outside, under the top cover of the housing.
If the regulator is inside the chamber, you will need to remove the plastic cover that hides the thermostat housing. Usually it is held on by latches or one screw hidden under a decorative plug. Proceed carefully, the plastic on old refrigerators can be brittle and brittle.
In the case of an external location (under the top cover), you must:
- Unscrew the screws securing the top cover of the refrigerator.
- Carefully lift the cover so as not to damage the wires going to the lamp or button defrosting.
- Remove the plastic casing covering the thermostat.
After removing the protective elements, your attention will be revealed thermostat with a capillary tube and electrical wires extending from it. At this stage, it is important to remember or photograph the wiring diagram so as not to mix up the contacts during assembly.
Features of models with No Frost
In Biryusa refrigerators with the No Frost system, the thermostat can be replaced with an electronic sensor (thermistor). The replacement principle is similar, but instead of a mechanical tube, it uses a wired sensor embedded in the evaporator.
Step-by-step instructions for replacing a part
The replacement process requires consistency and care. The main difficulty lies in carefully removing the sensitive capillary tube from the process channel in the evaporator. It may “stick” to the walls or get stuck in bends.
Start by disconnecting the electrical wires. It is best to mark them with a marker or take a close-up photo. Then remove the temperature control knob by simply pulling it towards you. After this, unscrew the screw securing the thermostat housing to the wall of the refrigerator.
☑️ Algorithm for replacing the thermostat
The most crucial moment is removing the tube. Take the pliers by the metal part of the tube (closer to the thermostat body, but not by the plastic body itself!) and slowly, without jerking, pull it outward. If the tube does not go, try turning it slightly around its axis. Do not use excessive force to avoid damaging the evaporator.
Installing a new element is carried out in the reverse order. Insert the tube into the channel until it stops. Make sure that it goes deep enough, otherwise the sensor will respond to the temperature of the air in the chamber, and not to the temperature of the evaporator, which will lead to incorrect operation.
| Operation stage | Action | Important nuance |
|---|---|---|
| Dismantling | Removing the handle and casing | Do not break the plastic latches |
| Disconnection | Removing the terminals from the contacts | Take a photo of the circuit connection |
| Removal | Pulling out the capillary tube | Pull slowly, without jerking |
| Installation | Installing a new tube | Insert all the way into the channel |
| Checking | Switching on and test | Monitor the on/off cycles |
Nuances of connecting an electrical circuit
Connecting wires is a critical moment. Thermostats usually have 2 or 3 contacts. If your old sensor had three wires, and the new one has two, or the colors of the wires do not match, you need to understand the logic of operation. One wire always goes from the mains (phase), the other - to the compressor, the third (if any) - to the defrost lamp or is simply a jumper.
In models Biryusa there is often a diagram where one contact is marked with a number 3, the other 4, and third 6. Typically, pins 3 and 4 close when the temperature drops, starting the compressor. Pin 6 can be responsible for indication or defrosting. If you mix up the wires, the refrigerator may not turn on or, conversely, work without stopping.
Use insulating tape or heat shrink for the connection points if you extended the wires or changed the terminals. Reliable insulation will prevent oxidation of contacts in conditions of high humidity inside the refrigerator compartment.
⚠️ Attention: If you are not sure about the color marking of the wires, use a multimeter in continuity mode. Find a pair of contacts that close when the sensitive tube in your hand heats up - this is the compressor circuit.
Checking operation and setting the temperature
After assembling all the elements and connecting the refrigerator to the network, the testing stage begins. Do not load food into the chamber immediately. Allow the unit to idle to reach operating mode. The first cycle of compressor operation can be long, since the system must cool the internal volume from room temperature to the set temperature.
Watch how often the engine turns on and off. Normally, the cycle is about 10-15 minutes of work and 20-30 minutes of rest, depending on the ambient temperature and load. If the compressor runs continuously for more than an hour and does not turn off even with the minimum setting of the regulator, perhaps the thermostat is selected incorrectly or the tube is poorly inserted.
Adjust the temperature smoothly. Set the knob to the middle position (usually this is a number 3 or 4). After a few hours, check the condition of the food in the refrigerator and freezer. If it is too cold in the refrigerator compartment and the food in the freezer is not frozen, you may need to adjust the screw under the seal (if there is one) or replace the sensor with a model with a different range.
Frequent errors when doing it yourself repair
Even experienced craftsmen sometimes make mistakes, let alone beginners. One of the most common problems is damage to the capillary tube during installation. Thin metal can easily be bitten with pliers or bent, which will lead to freon leakage from the thermostat itself (if it is full) or loss of sensitivity. In this case, the part will have to be thrown away.
Another error is insufficient immersion depth of the tube. If the end of the tube does not reach the evaporator area, the thermostat will “think” the refrigerator is warmer than it actually is and will cause the compressor to run longer than necessary. This will lead to the formation of a snow coat and excessive consumption of electricity.
The condition of the contacts is also often ignored. If the terminals are oxidized or burnt, they need to be cleaned or replaced. Poor contact causes heating and can melt the plastic housing of the thermostat, which will lead to repeated failure in a short time.
Is it possible to install a thermostat from another brand of refrigerator?
Yes, it is possible if the mounting dimensions, type of fastening and, most importantly, the temperature range match. The main thing is that the length of the capillary tube is sufficient for your model Biryusa. Universal thermostats of the TAM series are often suitable.
Why does the new thermostat click, but the compressor does not start?
This may indicate a malfunction of the compressor start relay or the engine itself. A click means that the thermostat is properly sending a signal, but the circuit does not close further or the engine cannot start. Also check for voltage at the thermostat input.
How often should you change the thermostat in the refrigerator?
The service life of the thermostat is not strictly limited in time. It is changed only after a breakdown. With careful operation and no power surges in the network, a high-quality thermostat can last 10 years or more.
Does replacing a thermostat affect the warranty?
If the warranty period is still valid, independent intervention and breaking the factory seals will void it. In this case, it is better to contact an authorized service center.
What to do if the capillary tube of the new thermostat is longer than the old one?
The excess length of the tube cannot be cut off. It must be carefully rolled into rings and placed inside the refrigerator body or behind the back panel, avoiding bends at an acute angle, so as not to disrupt the flow of refrigerant inside the tube.