If your two-chamber refrigerator stopped freezing or, conversely, began to turn food into an ice block, there is most likely a problem lies in the temperature sensor. This small element is responsible for turning the compressor on and off, maintaining an optimal microclimate inside the chambers. Do-it-yourself replacing the thermostat is a real task for a home craftsman, which will save a significant amount on calling a specialist.
In this article we will analyze in detail the process of diagnosing and installing a new regulator using the example of popular equipment Atlant. You will learn how to choose the right analogue, where it is located and what tools are needed for the job. Follow our recommendations to return the unit to functionality without extra costs.
Before starting disassembly, make sure that the device is completely disconnected from the power supply. Safety is the number one priority when tampering with electrical appliances. Next, we will look at the main symptoms indicating the failure of this particular control element.
Signs of a malfunctioning thermostat
You can understand that thermostat requires replacement by characteristic changes in the operation of refrigeration equipment. Users often confuse these symptoms with a freon leak or a compressor malfunction, which leads to unnecessary diagnostic costs. However, careful observation of the engine operating cycles allows you to quickly identify the problem.
The main indicator of a breakdown is the engine operating mode. If the motor hums continuously, without turning off for days, or is silent for hours until the food begins to melt, this is a direct signal of a failure in the control circuit. In normal condition, the compressor should operate cyclically, turning on and off at certain intervals.
- ❄️ The refrigerator compartment is too warm, food spoils quickly, and there is no frost on the back wall.
- 🧊 A “fur coat” or ice forms in the chamber, vegetables freeze, although the regulator is on minimum.
- 🔌 The compressor does not start at all, although the light inside is on and a hum is heard when trying to start.
- 🔨 Clicks when trying to start the engine, but the unit itself does not start.
It is worth noting that in two-chamber models Atlant with one compressor, it is the refrigeration chamber sensor that often fails. The freezer may continue to operate, but the overall cooling efficiency will decrease. If you notice such signs, do not delay repairs, as constant wear and tear on the motor can lead to an expensive replacement.
⚠️ Attention: If after defrosting the refrigerator within 24 hours the situation has not changed, the probability of a thermostat malfunction is more than 80%.
Diagnostics can be carried out method by closing the sensor contacts directly, but this requires skills in working with a multimeter. If you are not confident in your abilities, it is better to immediately proceed to visual inspection and preparation for replacement, since this element is a consumable item.
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Preparation of tools and selection of spare parts
For a successful replacement thermostat in the refrigerator Atlant it is necessary to prepare a working set of tools in advance. You don't need complex professional equipment; a basic home DIY kit is enough. High-quality preparation of the site and tools will reduce the repair time to one hour.
The key point is the correct selection of a new part. Thermostats are marked with special codes, and installing an unsuitable analogue can lead to incorrect operation of the system. For two-chamber models Atlant sensors of the TAM series or similar ones in terms of on/off parameters are most often used.
- 🔧 A set of screwdrivers (Phillips and flat) for removing panels and fasteners.
- 🔪 A sharp knife or a scalpel for carefully removing insulation and stripping contacts.
- 🧤 Insulating tape or heat shrink for sealing connections.
- 🧼 Pliers for conveniently gripping wires and removing clamps.
When purchasing a new part, pay attention to length capillary tube. It should not be significantly shorter than the original, otherwise the sensor will not correctly read the temperature in the depths of the evaporator. A tube that is too long can be carefully laid in rings without bending it, so as not to break the tightness of the system.
⚠️ Attention: The capillary tube of the thermostat is very thin and fragile. Do not bend it at an acute angle or allow impacts, otherwise the gas inside will evaporate and the sensor will stop working.
It is also recommended to have industrial alcohol or degreaser on hand to treat the contact group before installation. Clean contacts will ensure a reliable connection and prevent sparking, which could melt the plastic housing of the regulator in the future.
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☑️ Ready for repair
Removing the old thermostat in the Atlant refrigerator
The process of removing a faulty element in models Atlant requires care, since plastic panels can be fragile, especially if the refrigerator is many years old. In two-chamber versions, the thermostat is usually located inside the refrigerator compartment, hidden behind a decorative trim or directly in the lampshade.
First you need to remove the top cover inside the refrigerator compartment. In some modifications Atlant it is fastened with latches, in others - with screws that need to be unscrewed. Be careful not to damage the wiring going to the lighting lamp, if it is integrated into the design of the lampshade.
After removing the cover, you will see yourself thermostat with a capillary tube coming out of it. The tube is fixed to the evaporator using a special clamp or simply pressed against the wall. Carefully disconnect the tube, being careful not to jerk it sharply, so as not to damage the inside of the sensor.
Next we move on to the electrical part. Before disconnecting the wires, it is strongly recommended to take a photo of the connection diagram or sketch the colors of the wires and their location on the terminals. This will help avoid errors during assembly, since mixed up contacts can lead to a short circuit.
Disconnect the wires from the thermostat terminals. If they are oxidized, clean them to a metallic shine. The regulator itself is usually removed through a hole in the chamber wall. If it is stuck, shake it slightly, but do not use excessive force.
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What to do if the capillary tube is stuck?
Sometimes the tube may freeze or get stuck in isolation. In this case, you cannot pull it by force. Gently warm the outlet of the tube with a hairdryer (not a construction hair dryer, but a regular one for hair) or pour warm water through a syringe to release it without damage.
Installing a new temperature regulator
Installing a new one thermostat is done in the reverse order of dismantling. The main condition is to maintain the tightness of the capillary tube entering the fridge compartment. In models Atlant for this, a rubber bushing or oil seal is often used, which must be firmly seated in place.
Fix the capillary tube on the evaporator in the same position where the old one was. Use a standard clamp or aluminum trim. The tightly pressed tube ensures a quick response of the system to changes in temperature inside the chamber. If the tube dangles in the air, the compressor's operating cycle will be disrupted.
Connect the electrical wires to the terminals of the new sensor according to the diagram or photograph made earlier. Make sure the connections are tight and the wires do not come out when pulled lightly. For reliability, you can lightly compress the terminals with pliers, but without fanaticism, so as not to break the plastic.
- 📍 Place the thermostat body in the seat, avoiding kinks in the wires.
- 🔒 Install the regulator handle in place, aligning the marks with the sensor shaft.
- 🛡️ Return the decorative cover or lampshade to its place by snapping the latches.
- 🔌 Check the reliability of all elements before connecting them to the network.
After assembling the entire structure, you can proceed to testing. Plug in the refrigerator and set the control knob to the middle position. After 10-15 minutes, a characteristic click should be heard and the compressor will start.
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Setting up and checking operation
After replacing thermostat in a two-chamber refrigerator Atlant it is important to correctly configure its operation. Immediately after switching on, the unit can work longer than usual, raising the temperature. This is a normal process, but it requires control to prevent overcooling of the products.
Set the regulator knob to the position corresponding to the average temperature (usually this is a division of 3 or 4 out of 5-7 possible). Let the refrigerator run for several hours without loading food. This will allow the system to return to normal operation and stabilize the temperature background.
Use an external thermometer placed in a glass of water to accurately check the temperature in the chamber. Optimal values for the refrigerator compartment are in the range from +2 to +6 degrees Celsius. If the readings are very different, the handle position will need to be adjusted.
| Handle position | Temperature mode | Compressor operating time | Recommendation |
|---|---|---|---|
| Minimum (1) | +6...+8°C | Short cycles | Summer, light load |
| Medium (3-4) | +3...+5°C | Normal cycle | Standard mode |
| Maximum (Max) | 0...+2°C | Long operation | Fast freezing |
| Off (0) | Ambient temperature | Not works | Defrosting or washing |
Pay attention to the frequency of motor starts. In a working refrigerator Atlant with a new thermostat, the compressor should turn on approximately 2-4 times per hour, depending on the load and ambient temperature. If the motor “clocks” too often (every 2-3 minutes), the sensor may be configured incorrectly or has too wide a temperature spread.
⚠️ Attention: On the first day after replacing the thermostat, do not completely load the refrigerator with food. Allow the system to idle to avoid unnecessary load on the compressor.
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Frequent errors during replacement and their elimination
Even with video instructions beginners can make mistakes that will negate all efforts. The most common problem is poor contact between the capillary tube and the evaporator. If the tube is not pressed tightly, the sensor will “lie”, reading the temperature of the air rather than the surface, which will lead to incorrect operating cycles.
Another mistake is incorrect installation of electrical contacts. If the ground or ground wire is connected to a phase, this may cause a breakdown on the refrigerator body. Touching such a unit will be life-threatening. Always double-check the connection diagram before final assembly.
Some craftsmen try to shorten the capillary tube if it is too long for a particular model Atlant. This is absolutely not allowed! The tube is filled with gas or liquid under pressure. Violation of the tightness will lead to an immediate loss of functionality of the thermostat. It is better to carefully wrap the excess length into a ring behind the back panel.
- ⛔ Bend the capillary tube at an angle of less than 45 degrees (risk of rupture).
- ⛔ Using low-quality electrical tape, which will dry out from the cold.
- ⛔ Ignoring stripping of contacts, which leads to heating and melting of the terminals.
- ⛔ Installing a thermostat without checking its functionality with a multimeter.
If after replacement the refrigerator behaves strangely (for example, it does not turn off at all), do not rush to disassemble everything again. Let the system sit for 6-8 hours. If the problem persists, check whether the capillary tube is touching moving parts or fans (if your model has them).
⚠️ Attention: Technical characteristics and location of components in different models of Atlant refrigerators may vary. Always check the device passport or the diagram included in the kit, if it is preserved.
Can you use a thermostat from another refrigerator model?
The use of analogues is possible, but only if the on and off parameters, as well as the length of the capillary tube, are the same. Universal thermostats require precise adjustment, which is difficult to do without special equipment. It is better to look for the original or a complete analogue by catalog number.
Why does the refrigerator click but does not turn on after replacement?
The click means that the thermostat sends a signal to start, but the compressor does not start. This may indicate a malfunction of the start relay, the compressor itself, or a lack of voltage in the network. It is also possible that the thermostat contacts do not close completely due to a defect or incorrect installation.
Is it necessary to defrost the refrigerator before replacing the thermostat?
Yes, complete defrosting is required. Moisture inside the camera may cause a short circuit when handling electrical contacts. In addition, ice can interfere with access to the fastening elements and the capillary tube.
How to understand that the thermostat is defective?
The new thermostat should be “ringed” with a multimeter in the on position. If there is no click when you turn the knob, or the resistance does not change, the part is faulty. Also, a sign of a defect may be a leak in the capillary system.