Refrigerator RV: purpose, principle of operation and fault diagnosis

Have you ever heard of Refrigerator RAC and wondered what is hidden behind this abbreviation? If your refrigerator suddenly stops freezing, a strange noise appears, or the compressor runs nonstop, the problem may lie in this small but critically important unit. The RAC (reverse action valve) is one of those parts that most users do not even suspect exists until it fails.

In modern refrigerators with a system No Frost or models with two compressors, the RAC plays a key role in distributing the refrigerant between the chambers. Its breakdown leads to a whole bunch of problems: from insufficient cooling to complete equipment failure. In this article we will analyze in detail what is a CRFhow it works, what symptoms indicate its malfunction and whether it is possible to cope with the repair yourself - without calling a specialist.

If you notice that the refrigerator has become worse at freezing, and the freezer, on the contrary, is covered with ice - do not rush to blame thermostat or compressor. With a 60% probability, the reversing valve is to blame. Next, you will learn how to check it and what to do if it fails.

What is an EAC in the refrigerator and why is it needed?

Abbreviation KRV stands for reversing valve (sometimes it is called four-way valve or solenoid valve). This is an electromechanical device that controls the flow of refrigerant (freon) between the evaporators of the refrigerator and freezer compartments. Its main task is switch the direction of freon movement depending on the current needs of the system.

In refrigerators with one compressor and two chambers (for example, in models Atlant, Samsung RL or LG GC), the RAC works on the “either-or” principle: when the freezer is cooled, the refrigerator compartment is temporarily disconnected from the refrigerant supply, and vice versa. This allows one compressor to effectively serve both zones without additional energy costs.

• 🔧 Where is the KVV located? It is usually installed on the pipeline next to the compressor, at the rear of the refrigerator. Outwardly it looks like a small metal cylinder with wires and tubes.
• ⚡ How does it work? The valve is controlled by an electromagnetic coil (solenoid), which, at the command of the electronic unit, opens or closes the passage for freon.
• ❄️ Why is it needed? Without It is impossible for the KRV to independently regulate the temperature in the refrigerator and freezer compartments.

In models with the system No Frost The KRV also participates in the evaporator defrost cycle, switching the refrigerant flow to distribute the cold evenly. If the valve gets stuck in one position, one of the chambers will begin to freeze, and the other will overheat.

The design and principle of operation of a reversing valve

To understand how the RCV works, let's analyze its design. The valve consists of several key elements:

1. Case —a metal or plastic shell with inlet/outlet pipes for the refrigerant.
2. Solenoid (coil) —an electromagnet, which, when voltage is applied, moves the internal piston.
3. Piston (spool) —a movable element that blocks or opens channels for freon.
4. Spring —returns the piston to its original position when the power is turned off.

The principle of operation is based on switching the refrigerant flow between two circuits:

1. When voltage is applied to the solenoid, the piston moves, opening the way for freon in freezer compartment and blocking its supply to the refrigerator.
2. When the power is turned off, the spring returns the piston to its original position, and the freon is directed to fridge compartment.

In refrigerators with electronically controlled (for example, Samsung RB or Bosch KAN) the switching of the CVR is controlled by a control board based on the readings of temperature sensors. In mechanical models, the valve is activated by a timer or when the specified parameters are reached.

Signs of a malfunctioning valve: when it’s time to sound the alarm

The reversing valve is a consumable item that wears out over time. Its average service life is 5–7 years, but with intensive use or power surges it may fail earlier. Here main symptomsindicating problems with CRF:

• ❄️ The refrigerator compartment does not cool, and the freezer is working as usual (or vice versa).
• 🔥 One of the chambers freezes, the other - overheats. For example, in the freezer -25°C, and in the refrigerator +15°C.
• 🕒 The compressor runs without stopping, but the temperature does not stabilize.
• 💥 Clicking or buzzing noises from the back of the refrigerator (especially when switching modes). Clicking or buzzing noises associated with the cooling system (for example, data-i="145">Errors on the display
• ⚡ Errors on the displayrelated to the cooling system (for example, E1 V Indesit or F7 V LG).

One of the most obvious signs is uneven coolingFor example, if you notice that the food in the refrigerator compartment is spoiling in a day or two, and the freezer is covered with a thick layer of ice, there is a 90% chance that the problem is in the refrigerator. works, but the temperature in both chambers is equally high - this may mean that the valve is stuck in the neutral position, and freon does not flow into either chamber.

What will happen if you ignore the malfunction of the valve?

If you do not replace the valve on time, the compressor will start working at wear, trying to compensate for the lack of cold. This will lead to its overheating and failure - and repairing the compressor will cost 3-5 times more than replacing the air conditioner.

⚠️ Attention: In refrigerators with inverter compressor (for example, Samsung Digital Inverter or LG Smart Inverter) CRF can cause a malfunction of the electronic board. If after replacing the valve the refrigerator does not turn on, diagnostics of the control module will be required.

How to check the refrigerator's EAC yourself

Before calling a technician, you can Attempt self-diagnosis. To do this you will need:

• 🔧 Screwdriver (Phillips/flat head).
• 📊 Multimeter (to check the coil resistance).
• 👓 Flashlight (to inspect the back of the refrigerator).

Step 1. Disconnect the refrigerator from the network and carefully remove the back cover (if there is one). The RAC is usually located next to the compressor - it is a small cylinder with 3-4 tubes and two wires.

Step 2. Check the mechanical part:

• Inspect the tubes for signs icing or oil drips (indicates a freon leak).
• Try to gently move the valve with your hand - if it does not give in or moves with difficulty, most likely the piston is jammed.

Step 3. Check the electrical part:

• Disconnect the wires from the KRV coil.
• Measure the resistance between contacts using a multimeter. The normal value is 200–600 Ohm (for exact data, see the technical documentation of your model). If the device shows 0 (short circuit) or ∞ (open), the coil is faulty.

If the valve is externally intact, but the refrigerator is not working correctly, you can check it “by ear”: when switching modes, a working valve emits distinct click. Its absence is a sign of a malfunction of the solenoid or a jammed piston.

⚠️ Attention: Do not try to disassemble the control valve yourself - there is a spring inside under high pressure. If you open it carelessly, you can damage the valve or get injured.

Is it possible to repair the valve or just replace it?

Unfortunately KRV is a non-repairable part. Its design does not require disassembly or replacement of individual components (for example, a coil or piston). If the valve is faulty, it can only be replaced with a new one.

The cost of a new KRV depends on the model of the refrigerator:

• 💰 For budget brands (Atlant, Biryusa) — 1 500–3 000 ₽.
• 💰 For the middle segment (Indesit, Samsung, LG) — 3 000–6 000 ₽.
• 💰 For premium brands (Liebherr, Bosch Serie 8) — 6 000–12 000 ₽.

Independent replacement is possible if you have experience working with refrigeration equipment. For this you will need:

1. Purchase exact analogue valve (the part number is indicated on the body of the old valve).
2. Drain the freon from the system (special equipment will be required).
3. Replace the valve and vacuum system.
4. Fill the refrigerator with freon (the volume and type of refrigerant are indicated on the compressor nameplate).

If you are not confident in your abilities, it is better contact professionals. The average cost of replacing the valve at a service center is 5 000–10 000 ₽ (including work and refilling freon).

Prevention: how to extend the life of the valve

Although the reversing valve is a consumable, its service life can be increased by following simple recommendations:

• ⚡ Stable voltage: Use voltage stabilizer —surges in the network most often damage the KRV coil.
• 🧊 Regular defrosting: Even in models with No Frost Once a year, turn off the refrigerator for 12-24 hours for preventive maintenance.
• 🔧 Cleaning condenser: Dust on the rear grille impairs heat transfer and forces the compressor (and therefore the air cooler) to work at the limit.
• 🚫 Do not overload the chambers: Excess products disrupt air circulation and make the cooling system work harder.

Also avoid frequent door openings - this leads to increased load on the compressor and, as a result, on the valve. the region has hot summers, install the refrigerator away from direct sunlight and heating appliances.

⚠️ Attention: In refrigerators with linear compressor (for example, Samsung Digital Inverter), the EAC experiences increased loads due to frequent mode switching. For such models, it is recommended to carry out. preventive diagnostics every 2-3 years.

Frequently asked questions about refrigerator EFC

Can a refrigerator operate without an EFC?

Technically, yes, but only in emergency mode. Without a reversing valve, the compressor will cool only one chamber (the one set to by default), and the second will remain without cold. In the long term, this will lead to overload of the compressor and its failure.

How to distinguish a breakdown of the compressor valve from a malfunction of the compressor?

If there are problems with the compressor both chambers do not cool, and the motor itself either does not turn on or works intermittently. If the ECV is faulty, one of the chambers will be freeze, and the other will be overheatAlso, if the valve breaks down, the compressor usually works without stopping, trying to compensate. imbalance.

How long does it take to replace the EAC in the service?

On average - 1.5–3 hours, if additional work is not required (for example, repairing a freon leak). In complex cases (for example, when replacing a valve in refrigerators Side-by-Side), the process can take up to 5–6 hours.

Possible Is it possible to temporarily do without replacing the valve?

Yes, but with reservations. If the valve is stuck in the “freezer” position, you can turn off the refrigerator. camera use only the freezer (and vice versa). However, this is a temporary solution - in the long term, a faulty valve will lead to breakdown of the compressor.

Why does a new VCR break down quickly?

Most often this is due to moisture entering the system when replacing or poor quality vacuuming before refilling freon. Also the reason may be unstable voltage on the network or compressor overload due to improper operation of the refrigerator.