The appearance of a flashing indicator or alphanumeric code on the display of a household appliance always causes alarm, especially when it comes to the safety of products. In the line of two-compressor equipment of the Belarusian brand Atlant the combination of symbols F5 is one of the most common signals of malfunctions in the control system. This code directly indicates a problem with the temperature sensor located in the evaporator of the refrigerator compartment, which requires immediate attention of the owner.
Ignoring the signal can lead to incorrect operation of the compressor, excessive consumption of electricity, or, worse, spoilage of food supplies due to insufficient or excessive cooling. Understanding the nature of this error will allow you to quickly determine whether the problem is a temporary software glitch or a serious failure that requires replacement of the electronic component. In most cases, the situation can be solved without calling a technician if you approach the matter consistently and carefully.
Modern refrigerators are equipped with sophisticated electronics that constantly monitor the condition of all components. The code F5 indicates that the control module has stopped receiving correct data from the evaporator temperature sensor or has received a signal that it is broken. This is a protective mechanism that prevents the system from operating in emergency mode.
It is important not to panic and not try to immediately disassemble the unit without carrying out an initial diagnosis. Often the reason lies in a power surge or a short-term loss of contact, which can be easily eliminated by rebooting the system. However, in some cases, intervention in the electrical circuit of the device will be required.
Deciphering the code and the principle of operation of the sensor
For accurate diagnostics, it is necessary to understand the role played by the element indicated by the error. In refrigerators Atlant with a No Frost or drip defrosting system, the evaporator temperature sensor (thermistor) plays a critical role. It monitors the degree of cooling of the heat exchanger and transmits data to the main controller.
When the control module detects a sensor circuit resistance that is outside the permissible limits (usually an open or short circuit), it blocks the normal operating cycle and displays a code F5. This means that the system is “blind” and does not know when to turn on or off the compressor, as well as when to start defrosting.
⚠️ Attention: Prolonged operation of the refrigerator with error F5 can lead to the evaporator becoming coated with ice ("coat"), since the defrost cycle will not start correctly. This will significantly increase the load on the compressor.
Thermistors used in this technique are semiconductor elements whose resistance varies depending on temperature. In good condition, their resistance curve is strictly linear over the operating range. A violation of this dependence or a complete break in the circuit is what the electronics records as a malfunction.
Primary diagnostics: resetting and checking the power supply
Before you begin Before disassembling the case and testing the contacts with a multimeter, it is necessary to eliminate the possibility of a software “freezing” of the controller. Electronic modules are sensitive to voltage changes in the network, and sometimes they can go into an error state even with working sensors.
The first step is to perform a complete system reset. To do this, disconnect the refrigerator from the electrical network. Do not just remove the plug from the socket, but ensure that the power circuit is completely broken. Leave the device turned off for at least 15–20 minutes. This time is necessary for the capacitors on the control board to discharge and temporary data to be erased from the controller's RAM.
After a pause, turn on the appliance again and carefully watch the display. If error F5 disappears and after some time (usually 15–30 minutes of operation) does not appear again, it means that a single failure has occurred. If the code comes on again almost immediately after turning on the compressor, the problem is hardware in nature.
Pay attention to the behavior of the compressor. If, when turned on, it starts to work continuously without turning off, or, conversely, does not start at all, this confirms that the control module has entered emergency mode due to the lack of a signal from the temperature sensor.
Required tools and safety measures
To carry out further diagnostics and possible repairs, you will need a minimum set of tools. It is important to prepare the workplace in advance so as not to look for a screwdriver in the midst of the diagnostic process.
- 🔧 Phillips and flat screwdrivers - for removing panels and covers.
- 🔌 Multimeter (tester) - required to check the integrity of the sensor circuit.
- ✂️ Wire cutters or a knife - for stripping wires when replacing an element.
- 🧤 Insulating tape or heat shrink - for sealing connections.
Safety is priority number one. All manipulations inside the case associated with touching wires and electrical components are carried out ONLY with the device completely disconnected from the network. The residual voltage may be small, but the risk of electric shock or damage to the board if handled carelessly is real.
Caution should also be exercised when working with plastic interior elements. Plastic in refrigerators is often brittle, especially if the appliance has been left for a long time at low temperatures. Remove the panels smoothly, without sudden jerks, after first checking the presence of all fastening screws.
☑️ Ready for repair
Searching and checking the evaporator temperature sensor
Localizing the faulty element is a key step. In refrigerators Atlant the sensor responsible for code F5 is usually located in the refrigerator compartment. Access to it is often closed by a plastic panel on the back wall or side wall, depending on the model.
Carefully remove the decorative trim. Underneath it you will see an evaporator (finned radiator) and a small plastic element on a wire that fits it, often fixed in a special socket or pressed against the tube. This is the thermistor you are looking for.
To check, remove the sensor connector from the control board (it may be located behind the back cover of the refrigerator or inside the chamber, depending on the design). Connect the multimeter probes to the contacts of the sensor wire in resistance measurement mode (Ohm).
⚠️ Attention: The resistance of a working sensor at room temperature is usually several kilo-ohms (for example, 5–15 kOhm). If the multimeter shows "1" (infinity) or "0", the sensor is faulty. The exact values depend on the specific series of the refrigerator.
If the resistance is normal, check the integrity of the wire itself along the entire length. Fractures often occur at the points where the sensor exits the housing or near the connector. Lightly bending the wire during measurement can help identify a “floating” contact.
What to do if you don’t have a multimeter?
If there is no tester, you can try to temporarily replace the suspicious sensor with a known good one of the same rating. If the error disappears, the problem has been found. However, this method requires the presence of a spare part.
Replacing the temperature sensor and restoring the circuit
If diagnostics confirmed the failure of the sensor (break or short circuit), it must be replaced. These elements cannot be repaired, as their characteristics are irreversibly changed. You will need a new sensor with similar parameters (resistance at 25°C).
The replacement process involves disconnecting the old element and installing a new one. Often the sensor wires are simply cut, and a new one is soldered or connected through twisting. However, for reliability and durability, it is better to use soldering.
| Parameter | Norm / Action | Deviation |
|---|---|---|
| Resistance at 20-25°C | 5–15 kOhm (depending on the model) | 0 or ∞ (infinity) |
| Insulation integrity | No damage | Cracks, melting |
| Connector contacts | Clean, without oxides | Green coating, black |
| Fixing | Tight fit to the tube | Hanging in the air |
When connecting wires, be sure to use heat-shrink tubing or high-quality insulating tape. Moisture inside the refrigerator is an aggressive environment, and water entering the twist will lead to oxidation and a second error in a short time. The tightness of the connection is the key to the long service of the new sensor.
After installing the new element, reassemble the case in the reverse order. Turn on the refrigerator and check that the F5 code disappears. The system should start operating normally, turning the compressor on and off based on temperature.
Other possible causes and complex cases
Sometimes replacing the sensor does not bring results, and error F5 continues to light. In this case, the circle of suspects expands. The problem may lie in the control board itself, where the elements that process the signal from the sensor may have failed, or in poor contact in the connector.
Inspect the connector on the control board. If the contacts are oxidized or loose, current will not flow correctly. Cleaning the contacts with alcohol and bending the connector tabs may solve the problem. It is also worth checking the tracks on the board for microcracks.
In rare cases, the cause may be damage to the wiring harness running from the door to the housing (if the sensor is located there) or inside the camera. Frayed wires are often masked under insulation, so a visual inspection may not yield anything - you need to “test” each wire separately.
Is it possible to operate a refrigerator with an error? F5?
Short-term - yes, if you control the temperature manually. However, in the long term, this is dangerous: the compressor can work without stopping, which will lead to its overheating and failure, or the products will defrost due to the lack of cooling cycles.
Where to buy an original sensor for Atlant?
It is better to purchase original spare parts from authorized service centers of the brand or specialized stores of spare parts for household appliances. When purchasing, pay attention to the markings and resistance, since sensors of different models may be visually identical.
How long does it take to replace a sensor?
For an experienced user, the diagnostic and replacement process takes from 30 to 60 minutes. Most of the time is spent on carefully disassembling the panels and high-quality insulation of the connections so as not to damage the plastic and ensure tightness.
Why did the error appear after a power surge?
Power surges in the network are a common cause of failure of sensitive electronics. The pulse could damage the thermistor itself or the elements on the control board that regulate the flow of current to the sensor. In such cases, it is recommended to use a voltage stabilizer.
Does error F5 affect the freezer compartment?
In two-compressor models, the refrigeration and freezer compartments operate independently. Error F5 refers to the refrigeration chamber evaporator sensor. The freezer may continue to work normally, but the total energy consumption will increase due to incorrect operation of the primary circuit.