Belarusian-made refrigerators Atlant are deservedly popular due to their reliability, but even time-tested models sometimes experience malfunctions in the No Frost system or defrosting circuit. One of the key elements to ensure proper refrigerant circulation or air flow control is the valve. If you notice that it has become warmer in the refrigerator compartment, and a coat of ice has formed on the back wall of the freezer, the cause is often the failure of this unit.
Diagnostics of valves in refrigeration equipment is a process that requires care and basic skills in working with electrical measuring instruments. In models Atlant most often there are solenoid valves that regulate the supply of freon to the evaporator, and check valves that prevent its reverse flow. Understanding the principle of their operation will help you quickly determine whether a part needs to be replaced or the problem lies elsewhere.
In this article we will analyze a step-by-step algorithm of actions that will allow you to carry out the check yourself. You will learn what tools you will need, how to properly test the windings with a multimeter, and what visual signs of a malfunction you should pay attention to first. Competent diagnostics will save your time and avoid purchasing unnecessary spare parts.
Symptoms of valve system failure
Before disassembling the unit, it is necessary to compare the observed symptoms with typical signs of valve failure. If solenoid valve stops opening or closing at the controller's command, the refrigerant stops flowing into the evaporator or, conversely, circulates uncontrollably. This leads to the fact that the compressor works without stopping, trying to gain temperature, but the chambers are warm.
In systems with No Frost the defrost valve or check valve in the condensate drain circuit often fails. In such cases, you may notice a build-up of ice on the fan, the appearance of puddles under the refrigerator, or a characteristic hum that the fan makes as it hits ice build-ups. Also an alarming signal is the absence of a characteristic click when switching operating modes.
⚠️ Attention: If you hear the hissing of gas or smell a specific smell of refrigerant, immediately stop diagnostics and ventilate the room. Dealing with freon leaks requires special equipment and qualifications.
Another indirect sign may be incorrect operation of the indicators on the control panel or frequent switching on and off of the compressor (clocking). However, it is worth remembering that similar symptoms can be caused by malfunctions of the thermostat, start relay or the compressor itself, so a comprehensive check is required.
Necessary tools and preparation
For high-quality diagnostics, you will need a minimum set of tools that most home craftsmen can find. The main device will be a digital multimeter capable of measuring resistance in Ohms and checking circuit integrity. Without it, it is almost impossible to determine a break or an interturn short circuit in the valve coil.
You will also need screwdrivers (Phillips and flathead) for dismantling the panels, pliers and, possibly, electrical tape for marking the wires. Do not forget to prepare a container for water and a rag, since when disassembling the evaporator area, condensation or residual refrigerant from the defrost system may leak out.
- 🔧 Digital multimeter with dial function
- 🪛 Screwdriver set (PH2, SL4)
- 🔦 Flashlight for illuminating hard-to-reach places
- 🧤 Dielectric gloves for safety
Before starting any work be sure to unplug the refrigerator from the power supply. Even briefly touching exposed live contacts can lead to serious consequences. Let the unit stand unplugged for 10-15 minutes so that the capacitors discharge and the pressure in the system stabilizes.
☑️ Preparation for diagnostics
Access to the valve and visual inspection
Location of valves in refrigerators Atlant depends on the specific model and type of cooling system. In classic two-compartment models, the solenoid valve is often located at the bottom of the unit, next to the compressor, or hidden behind the back panel of the freezer. In models with No Frost air flow control elements are located directly in the air ducts behind the evaporator.
To access the units in the freezer, you must remove all shelves, drawers and dismantle the plastic back wall. It is usually attached with self-tapping screws or plastic latches. Proceed carefully, as plastic becomes brittle after prolonged use at low temperatures and may crack if tugged carelessly.
After gaining access, conduct a thorough visual inspection. Look for signs of corrosion on the contacts, melted wire insulation, or visible mechanical damage to the valve body. If you notice black marks on the connection connector, this is a sure sign of overheating and poor electrical contact.
⚠️ Attention: Do not try to forcefully tear off frozen parts. If the plastic or tubes are stuck with ice, use a hairdryer at minimum power or simply let the ice melt naturally so as not to damage the system.
Pay special attention to the condition of the tubes suitable for the valve. The presence of oily spots may indicate microcracks or a violation of the tightness of connections, which also requires the intervention of a technician with refueling equipment.
Where to look for the valve in different models?
In two-chamber Atlant models with one compressor, the solenoid valve is often located in a foamed circuit or hidden in a niche next to the motor. In models with the No Frost system, look for it behind the rear panel of the freezer compartment, next to the defrost heating element.
Method of checking the solenoid valve
The solenoid valve is a solenoid that opens or closes the passage for refrigerant when voltage is applied. The main test is to measure the resistance of its coil. To do this, switch the multimeter to resistance measurement mode (Ohms) and connect the probes to the valve connector contacts.
The normal resistance of a working coil is usually in the range of 1 to 2 kOhms (1000–2000 Ohms), although the exact values depend on the model. If the device shows one (infinity), it means that there is a break in the winding and the valve will not be able to open. If the resistance is close to zero, there is a short circuit.
It is also important to check whether voltage is coming to the valve from the control board. To do this, you will need to turn on the refrigerator and carefully move the multimeter probes in AC Voltage mode to the connector contacts at the moment when the valve should open. Be extremely careful not to short the contacts together.
| Multimeter indicator | Value | Action |
|---|---|---|
| 1000 - 2500 Ohm | Normal | The valve is working, we are looking for another reason |
| 0 Ohm or close | Short circuit | Valve replacement is required |
| ∞ (Unit) | Open circuit | Valve replacement is required |
| Floating values | Unstable contact | Checking wires and connector |
If the electrical part of the valve is in order, but it does not click when voltage is applied, the mechanical rod may be stuck inside. In domestic conditions, it is almost impossible to disassemble and restore the sealed valve body - a complete replacement of the assembly is required.
Diagnostics of the check valve and the No Frost system
In the system No Frost An important role is played by the check valve, which is often installed in the drainage system or defrost circuit. Its task is to pass melt water or vapor in only one direction. Checking this element differs from checking its electromagnetic counterpart, since it does not have an electrical winding.
To diagnose the check valve, it is necessary to dismantle it and blow it out. In one direction the air should flow freely, and in the opposite direction the flow should be completely blocked. If air passes in both directions or does not pass in either direction, the valve is faulty and requires replacement.
- ❄️ Remove the valve by disconnecting the pipes
- 🌬️ Try blowing it on one side
- 🔄 Turn the valve over and blow it on the other sides
- 🛑 Replace the part if the blowing direction does not change
Often problems with the check valve are associated with debris getting in or the formation of an ice plug inside it. Thorough washing with warm water can temporarily solve the problem, but it is better to install a new element, since rubber seals become tanned over time. Atlantakh associated with the ingress of debris or the formation of an ice plug inside it. Thorough rinsing with warm water can temporarily solve the problem, but it is better to install a new element, since rubber seals will harden over time.
It is also worth checking the sensors that control the operation of the valves in the defrost system. If the defrost sensor is “lying,” the controller will not send a signal to open the valve or turn on the heating element, which will lead to ice fouling on the evaporator. The sensors are checked by dialing: at room temperature they should ring, and when cooled, open the circuit.
Valve replacement and assembly system
If the check confirms a malfunction, the valve must be replaced. For electromagnetic models working with freon, the replacement process requires pumping out the refrigerant, soldering the tubes and subsequent evacuation and charging of the system. Independent soldering without a license and equipment is prohibited by the legislation of many countries due to environmental regulations and the danger of explosion.
However, if we are talking about replacing a valve in the air system flaps or drainage (plastic elements), you can handle it yourself. Carefully disconnect the old unit, remembering the order in which the pipes and wires are connected. It is advisable to photograph the connection diagram before dismantling.
Install the new valve, making sure that all the rubber seals are in place. A loose fit can lead to warm air being sucked in and condensation forming. After installation, reassemble the housing in the reverse order, remembering to fasten all the screws.
⚠️ Attention: If you have changed elements associated with the refrigerant circuit, starting the refrigerator without professional evacuation and refilling with freon will lead to compressor failure. Call a technician to complete the work.
After complete assembly, turn on the refrigerator and listen to its operation for 30-60 minutes. Make sure that there is no extraneous noise, and the temperature in the chambers begins to decrease according to the set values.
What to do if a new valve is not on sale?
If the original valve cannot be found, you can select an analogue based on the electrical parameters (coil voltage and resistance) and the geometric dimensions of the connecting pipes. It is important that the operating pressure and temperature of the new valve medium meet the requirements of the Atlant refrigerator.
Frequently asked questions and answers
Is it possible to temporarily short-circuit the valve contacts to make the refrigerator work?
Doing this is strictly not recommended. Forced supply of voltage can lead to overheating of the compressor, freezing of the evaporator “to stone” and failure of the control board. The system should operate in normal cyclic mode.
Why does the new valve hum more than the old one?
A slight hum or vibration when the solenoid valve operates is normal. If the hum is very strong, check whether the valve is securely attached to the body. Sometimes the vibration is transmitted to the plastic panels, amplifying the sound.
How often do you need to change the valve in the Atlant refrigerator?
The service life of the valves is not strictly regulated and depends on operating conditions, power surges and the quality of the refrigerant. During normal operation, they last 10 years or more. Replacement is required only if a malfunction is detected.
Can a faulty valve cause high energy consumption?
Yes, if the valve does not close completely or the refrigerator operates in emergency mode due to its breakdown, the compressor can work without stopping, which will significantly increase energy consumption.