Sudden defrosting of food or, conversely, the formation of an ice coat on the back wall often indicates problems in the temperature control system. Thermal relay, or thermostat, is a key element that signals the compressor to turn on or off depending on the temperature in the chamber. If this unit fails, the refrigerator ceases to maintain the set mode, which can lead to spoilage of supplies or overheating of the motor.
Equipment owners Biryusa should not immediately call a technician, since the initial diagnosis can be carried out independently, having a minimal set of tools at hand. Understanding how this device works will allow you to save time and money, and also accurately determine whether a part needs to be replaced or the problem lies in another unit. Below we will analyze in detail how to identify a malfunction and what is required for this.
The principle of operation and the main signs of failure
Thermostat in refrigerators Biryusa is a mechanical or electronic device that responds to changes in temperature inside the chamber. Inside the housing there is a bellows tube filled with freon, which contracts or expands when heated and cooled. These movements open or close electrical contacts that control the operation compressor. When the temperature reaches the set value, the circuit opens and the motor stops.
You can understand that the device has failed by characteristic symptoms, ignoring which can lead to serious consequences. Most often, a breakdown manifests itself in an incorrect operating cycle of the unit, which becomes noticeable even without special devices. If the compressor runs continuously without turning off for hours, or, conversely, does not start at all when plugged in, this is a direct signal of problems with the thermostat.
⚠️ Attention: Constant operation of the compressor without shutting off can lead to to his burnout. If such a symptom is detected, immediately disconnect the refrigerator from the network and carry out diagnostics.
Other signs of a malfunction include the absence of a click when turning the regulator, the formation of ice in only one corner of the chamber, or the complete absence of cold when the motor is running. It is important to consider that similar symptoms can be observed with a freon leak or a malfunction of the start relay, so a comprehensive check will help avoid mistakes.
Necessary tools for diagnostics
To conduct a quality check, you will need to prepare a workplace and a certain set of tools. Without them, accurate diagnosis is impossible, since visual inspection often does not provide a complete picture of the condition of internal contacts. The main device here is multimeter, which allows you to measure the resistance of the circuit.
In addition to the measuring device, you will need screwdrivers to remove the casing and the thermal relay itself. Some models Biryusa may require pliers or special clamps to carefully remove the capillary tube. Do not forget to provide good lighting of the working area, since the insides of the refrigeration unit are often hidden in hard-to-reach places.
- 🛠️ Multimeter (tester) with continuity or resistance measurement mode.
- 🔧 Set of screwdrivers (phillips and flat) for dismantling panels.
- 🧤 Gloves to protect hands from sharp edges and dirt.
- 📱 Flashlight for illuminating the interior of the chamber.
Before starting work, be sure to make sure that the refrigerator is disconnected from the power supply. This is a basic safety rule and failure to comply may result in electric shock. It is also worth preparing a container to collect possible moisture that may form when the evaporator defrosts during the repair process.
Removing the thermostat in Biryusa refrigerators
The process of removing the thermostat may differ depending on the model of your refrigerator Biryusa. In most old and medium-sized modifications, the temperature regulator is located inside the refrigerator compartment, often in a corner or under a lampshade. In modern electronically controlled models, sensors may be built into the wall, but mechanical thermostats are usually accessible after removing the protective panel.
To access the assembly, first remove the temperature regulator by pulling it towards you. There may be a mounting screw underneath that needs to be unscrewed. Then carefully remove the plastic cover or the entire control box to gain access to the electrical contacts and bellows tube. Proceed carefully so as not to damage fragile plastic or wire insulation.
☑️ Preparation for dismantling
The bellows tube is attached to the evaporator using a special clamp. You need to carefully open it and release the tube, but under no circumstances bend or squeeze it, as this will break the tightness of the system. After releasing the tube, disconnect the wires from the thermostat contacts, having previously memorized or photographed the connection diagram.
Checking with a multimeter: step-by-step algorithm
The most reliable way to check is using multimeter. This method allows you to determine the integrity of the electrical circuit and the condition of the contacts with high accuracy. Switch the device to resistance measurement mode (Ohm) or continuity mode. If you don't have a multimeter, you can use a simple light bulb with wires connected to a battery, but this is less informative.
Attach the multimeter probes to the contacts of the thermal relay. In normal condition (at room temperature), the contacts should be closed, and the device will show zero or close to zero resistance. If the device shows one or infinity, then the circuit is open and the thermostat is faulty. However, this is only true for checking in a “warm” state.
For a complete diagnosis, it is necessary to check the opening of the contacts during cooling. To do this, the thermal relay (without the tube, if it is already disconnected, or together with it, being careful) must be placed in a cold environment. You can use a freezer or a container with ice and salt. Immerse the bellows tube in the cold for 2-3 minutes, and then ring the contacts again.
Nuances of checking the contacts
If the resistance did not change during cooling (remained zero), then the contacts are stuck. If the resistance remains infinite even in the heat, there is a break inside. In both cases, replacement is required.
For Biryusy standard values are typical, but it is better to look at the exact data in the technical documentation of the specific model. If the contacts do not open in the cold, the compressor will work constantly.
Table of temperature conditions and parameters
Understanding temperature conditions helps to correctly configure the thermostat after replacement or diagnostics. Incorrect settings can create the illusion of a breakdown, although in fact the device is working properly. Below are approximate values for various positions of the regulator.
It is worth considering that the values may vary depending on the load of the chamber with products and the ambient temperature in the room. If the room is too hot or too cold, the refrigerator may not work correctly, even with a working relay. data-i="109">Compressor operating time Biryusa may not work correctly even with a working relay.
| Regulator position | Chamber temperature (°C) | Compressor operating time | Status |
|---|---|---|---|
| Minimum (1) | +4..+6 | Short cycles | Economy |
| Average (2-3) | +2..+4 | Normal cycle | Recommended |
| Maximum (4-5) | 0..+2 | Long work | Intensive |
| Freeze | Below 0 | Continuous | Emergency |
When the regulator is set to the "Frozen" or "Max" position, the compressor may not turn off for a long time, which is normal for rapid cooling. However, if, after returning the handle to the middle position, the motor continues to hum without a break for more than an hour, this is a cause for concern.
Common mistakes when replacing yourself
Replacing a thermal relay seems like a simple operation, but beginners often make mistakes that lead to repeated breakdowns. One of the most common problems is improper placement of the bellows tube. It must fit tightly to the evaporator in a specially designated place, otherwise the sensor will show the wrong temperature.
Another mistake is ignoring the markings of the wires. Before disconnecting, be sure to take a photo or diagram, as reversed contacts can lead to a short circuit or the fan working instead of the compressor (in some circuits). The colors of the wires in different models Turk may vary.
⚠️ Attention: Do not use thermostats with other markings without consulting a specialist. Different models have different capillary tube lengths and temperature response ranges.
Also, do not (forcibly) bend the capillary tube. Inside it there is a thin channel that can be easily pinched. Even microscopic deformation will disrupt the transfer of freon pressure to the membrane, and the relay will stop responding to temperature changes. Careful handling is the key to success.
When a part needs to be replaced
If diagnostics have shown a lack of contact response to temperature changes or mechanical destruction of the housing, replacement is inevitable. It is almost impossible to repair the thermostat itself, since it is a sealed unit. Attempts to open it will only lead to final breakdown and loss of tightness.
You should purchase a new part knowing the exact model of your refrigerator Biryusa. The spare part number is usually indicated on a nameplate inside the chamber or on the rear wall of the unit. Compatibility in terms of parameters (on/off temperature, tube length) is critical for stable operation.
After installing the new element and connecting the wires, reassemble the case in the reverse order. Turn on the refrigerator and let it run for several hours without loading food. This will allow the system to enter operating mode and ensure that the work has been carried out correctly.
Frequently asked questions (FAQ)
Is it possible to temporarily close the thermostat contacts so that the refrigerator did it work?
Yes, this can be done for a short-term check of the operation of the compressor or as an emergency measure before purchasing a spare part. However, you cannot leave the refrigerator in this mode for a long time: it will work continuously, which will lead to deep freezing of food and possible overheating of the motor.
Why does the refrigerator not turn off after replacing the thermostat?
You may have installed a thermostat with inappropriate temperature parameters or incorrectly secured the bellows tube. Also, the cause may be a freon leak: the compressor tries to gain temperature, but due to a lack of refrigerant it cannot do this, and the relay does not give a command to turn off.
Where is the thermostat in the Biryusa refrigerator with No Frost?
In No Frost systems, temperature sensors are often built into the air duct or located behind a plastic panel on the back wall of the chamber. Access to them may require partial disassembly of the internal space, unlike classic models where the relay is located near the lampshade.
How to distinguish a faulty thermal relay from a breakdown of the starting relay?
If you hear a click when you turn it on, the motor hums for 5-10 seconds and clicks again (stops) - most likely the problem is in the starting relay or compressor. If the motor does not respond at all or works without stopping, most likely the thermal relay is faulty.