Sudden defrosting of food or, conversely, turning the contents of the freezer into an ice block are sure signs that thermoregulation system has failed. In most models of Atlant refrigerators, it is the thermostat that is responsible for maintaining the set temperature, which can fail for various reasons. Understanding how to check the thermostat of an Atlant refrigerator at home will help you save on calling a technician and quickly bring the appliance back to life.
Before embarking on complex diagnostics, it is necessary to exclude trivial causes: incorrect installation of the regulator knob, a loosely closed door, or overloading the chamber with fresh food. If you are sure that the matter lies deeper, you will need a minimum set of tools and attentiveness. Thermostat is an electrical switch that opens the compressor circuit when the desired temperature is reached and closes it when it gets warmer.
In this article we will analyze in detail the symptoms of a malfunction, methods of checking using multimeter and without it, and also consider the nuances for different series of a popular brand. Safety —the first rule: any work on electrical components is carried out only after the device is completely disconnected from the network.
⚠️ Attention: Before starting any diagnostic work, make sure that the refrigerator is disconnected from the power supply for at least 15 minutes. This is necessary to discharge the capacitors and stabilize the pressure in the system, which is especially important for correctly checking the contacts.
Main signs of a thermostat malfunction
Diagnostics begins long before you pick up a screwdriver. The behavior of the refrigerator itself will tell you where to look for the problem. If the compressor runs continuously without turning off for hours, or, conversely, does not start at all, although it is warm inside, these are direct signals of failure thermostat. In normal operation, the engine turns on and off cyclically, maintaining the temperature.
Another striking symptom is the formation of a “snow coat” on the back wall of the refrigerator compartment or the appearance of puddles under the vegetable boxes. This suggests that the sensor does not “see” that the temperature has already dropped below normal, and continues to freeze. In some cases, the malfunction manifests itself in the form of sharp clicks when trying to start the engine.
- ❄️ The compressor works without interruptions or does not turn on at all.
- 💧 The appearance of condensation, ice or puddles inside the refrigerator compartment.
- 🌡️ The temperature of the products does not correspond the set values of the regulator knob.
- 🔊 Characteristic clicks at the moment when the motor should start or stop.
It is also worth paying attention to the condition of the products. If the ice cream in the freezer has become soft and the milk in the refrigerator has turned sour in one day, it means it is completely missing. However, similar symptoms can be observed if there is a freon leak or a compressor malfunction, so a visual inspection is only the first stage. temperature control completely absent. However, similar symptoms can be observed when there is a freon leak or a compressor malfunction, so a visual inspection is only the first stage.
Where is the thermostat located in different Atlant models
The location of the temperature sensor depends on the series and year of manufacture of your Atlant refrigerator. In older models, as well as in classic two-chamber versions, the thermostat is often hidden inside the refrigerator compartment. To get to it, you need to remove the plastic cover on the inner wall or dismantle the control panel if it is located inside.
In modern models with the No Frost system or in series with a remote control panel on the body, the thermostat may be located behind the back cover inside the chamber or even in the engine compartment if an electronic control module is used, although in mechanical versions it will still be inside. In some cases, access requires removing the top cover of the refrigerator, where the lighting lamp and control knob are attached.
If you are not sure of the location, refer to the instructions Atlant models. Typically the thermostat has a long capillary tube that extends deep into the chamber or is attached to the evaporator. It is this tube that senses temperature changes. In two-compressor models there will be two of them: one for the refrigeration chamber, the other for the freezer.
Location features in the KShD series
In Atlant refrigerators of the KShD series, the thermostat is often hidden behind a decorative trim on the ceiling of the chamber. To gain access, you need to carefully pry up the plastic panel with a knife or flat screwdriver, having first unscrewed the screws that secure the lampshade.
Preparation for diagnostics: tools and safety
For a quality check, you will need a minimum kit for a home technician. The main tool will be a multimeter (tester), which will allow you to ring the circuit for contact. Without this device, diagnostics will be less accurate and will require more time for experiments.
Also prepare screwdrivers (Phillips and flat-head), pliers and, possibly, a knife for stripping contacts. Don't forget about personal protective equipment: rubber gloves will protect you from accidental electric shock if there is residual voltage in the network, although when the cord is disconnected the risk is minimal.
☑️ Preparing to check the thermostat
It is important to ensure good lighting of the work area. The inside of the refrigerator compartment is often dark and the parts are small. Use a flashlight or lamp to clearly see the markings of the wires and the condition of the contacts. Cleanliness at the work site, it is also important that debris does not get inside the electrical part of the device.
⚠️ Attention: The capillary tube of the thermostat is very thin and fragile. When removing the sensor from the mounting socket, act extremely carefully so as not to damage it and prevent refrigerant leakage if it is attached to the evaporator.
Methods for checking a thermostat with a multimeter
The most reliable way to determine the performance of a part is by testing the contacts using a tester. First, you need to remove the thermostat by disconnecting the wires from it (after photographing their location so as not to get confused during assembly). There are usually three terminals on the device body, but we will work with the main circuit closure contacts.
Switch the multimeter to resistance (Ohm) or continuity measurement mode. Touch the probes to the thermostat contacts. At room temperature, the contacts of the mechanical thermostat should be closed, and the device will show zero or beep. If the screen shows “1” or “OL” (open), it means that the contacts do not close and the thermostat is faulty.
For a complete check, you can put the sensor in the freezer for 15-20 minutes (pre-pack it in a bag to prevent moisture from getting in). After cooling, the contacts should open (if it is a normally closed thermostat) or, conversely, close, depending on the type. However, in Atlant household refrigerators, contacts that are normally closed when heating are most often used, which open when cooling.
| Thermostat status | Multimeter reading (at room temperature) | Action |
|---|---|---|
| Good | 0 Ohm (beeping) | Install back |
| Faulty (break) | ∞ (infinity) | Replacement |
| Faulty (short circuit) | 0 Ohm (does not open in the cold) | Replacement |
| Unstable contact | Readings jump | Replacement |
If, after checking with a multimeter, you find an open circuit at room temperature, this is a clear signal for replacement. Sometimes the contacts can burn out, creating high resistance, which also leads to incorrect operation. In this case, it is better to replace the part, since repairing contacts at home is impossible.
Diagnostics without instruments: traditional methods
What to do if you don’t have a multimeter at hand? There is an elimination method that makes it possible to detect a malfunction with a high degree of probability. To do this, you need to short-circuit the wires coming from the thermostat directly (bypassing the sensor itself). If after this procedure the compressor starts and the refrigerator starts to freeze, then the problem was in the thermostat.
Another way is a visual inspection. Remove the regulator knob and look at the stem. If it is rusty or oxidized, the mechanism may jam. You can also gently tap the thermostat housing with the handle of a screwdriver. Sometimes stuck contacts “come unstuck” and the refrigerator starts, which confirms the mechanical nature of the breakdown.
However, the method of closing the wires requires caution. The compressor will start immediately and will run continuously until you open the circuit. Monitor the temperature in the chamber so as not to freeze the food during the experiment. This method is good for a quick check, but is not suitable for constant use.
- 🔌 Close the wires from the thermostat directly - does the motor work? This means that the sensor is broken.
- 👆 Tap on the case - has it started? The contacts are stuck.
- 👀 Inspect the rod - corrosion or breakage of the plastic indicates a mechanical failure.
Remember that such methods are a temporary solution for diagnosis. It is impossible to operate a refrigerator with a shorted thermostat, as it will freeze until the thermal protection relay trips or the compressor fails due to overload.
Replacing and setting up a new thermostat
If diagnostics confirm a malfunction, the thermostat must be replaced. When purchasing a new part, pay attention to the markings. For Atlant refrigerators, TAM or K-series thermostats are often used. It is important that the length of the capillary tube and the type of contacts match the original.
The installation process takes a little time. Carefully insert the tube into the evaporator socket (or secure it in its original place), connect the wires according to the photo taken earlier and fix the housing. After assembly, turn on the refrigerator and set the control knob to the middle position.
The first setup may take several hours. Let the refrigerator return to normal. If it turns off and on in a normal rhythm, and the temperature of the food is stable, you have completed the task. If the cycles are too short or long, the screw on the thermostat body may need to be adjusted, but this is best left to a specialist.
⚠️ Attention: Thermostat specifications (on/off temperature) may vary slightly depending on the manufacturer's batch. If after replacement the refrigerator does not work correctly, check the datasheet of the specific sensor model or contact a service center for calibration.
Frequently asked questions (FAQ)
Is it possible to temporarily operate a refrigerator with a faulty thermostat?
Theoretically, it is possible if you short-circuit the wires so that the compressor works constantly. However, this will lead to excessive energy consumption, icing of food and, most importantly, rapid wear or burnout of the compressor due to lack of rest. Use this mode only to save food before a technician arrives or purchase a spare part.
Why does the new thermostat click, but the refrigerator does not turn on?
If there is a click, then the thermostat is working. The problem may be with the compressor start relay, the motor itself, or the wiring. It is also possible that the new thermostat has different temperature response thresholds, and the current temperature in the chamber has not yet reached the value for switching on.
How to distinguish a thermostat from a temperature sensor in modern models?
A thermostat is a mechanical device with a capillary tube and an adjustment knob inside the chamber. A temperature sensor (thermistor) is a small electronic part, often in a plastic housing, connected to an electronic control module. The principle of checking them differs: the thermostat is called, and the sensor is checked for changes in resistance during heating/cooling.
How long does the thermostat in the Atlant refrigerator last?
The average service life of a mechanical thermostat is 5-7 years, but with frequent voltage fluctuations or aggressive use, it may fail earlier. Electronic sensors usually last longer, but are more sensitive to power surges in the network.