How to open the Atlant refrigerator relay correctly: instructions with photos and advice from experts

The refrigerator relay Atlant is a small but critical unit that is responsible for starting the compressor and protecting the system from overloads. When the refrigerator suddenly stops freezing, makes uncharacteristic clicks, or does not turn on at all, this device is often the culprit. However, before running to a service center, many owners try to diagnose the problem themselves - and the first step is the need open the relay for inspection or replacement.

In this article we will figure out how to properly dismantle the start-protective and thermal relay on refrigerators Atlant different models (from classic MHM-1705 to modern ATLANT XM 6025-031). You'll learn what tools you'll need, where exactly the relay is located in your model, and how to avoid common mistakes that can lead to a short circuit or compressor failure. And also - detailed wiring diagram after removing the relay, so as not to confuse the contacts during reassembly.

What relays are installed in Atlant refrigerators and where to look for them

In refrigerators Atlant two types of relays are used, which are often confused with each other:

• 🔧 Start-protection relay - starts the compressor and protects it from overheating. It is located directly on the compressor body (usually on the side or top) and is a black plastic box with wires.
• 🌡️ Thermostat (thermostat) - regulates the temperature in the chamber. Located inside the refrigerator, behind the plastic control panel (next to the thermostat knob) or under the top cover.

In most models Atlant (for example ATLANT XM 4021-000, MHM 1843) the start-up relay is attached to the compressor using spring clamp or a screw. The thermal relay can be hidden under a decorative cover - it must be carefully pryed off with a screwdriver so as not to break the plastic clips.

🔍 How to distinguish one relay from another? The starting protection relay is always connected to the compressor three-core cable (phase, zero, starting contact), and the thermal relay is connected to the temperature sensor (thin capillary pipeline).

Preparing for dismantling: tools and safety measures

Before starting disassembly, make sure that the refrigerator completely disconnected from the network. Even if it is not working, the capacitors in the circuit can retain charge. To work you will need:

• ⚒️ Phillips and flat screwdrivers (for screws and latches).
• 📸 Smartphone or camera - to photograph the location of the wires to them disconnection.
• 🔌 Multimeter (to check contacts after dismantling).
• 🧲 Magnet or marker - to mark the wires (if there is no diagram).

⚠️ Attention: If your refrigerator Atlant was produced after 2018, it can be used electronic relay with a control board. Such devices cannot be disassembled without special equipment - only complete replacement!

Disconnect the refrigerator from the outlet

Wait 10–15 minutes (discharge of capacitors)

Take a photo of the wire connection

Prepare tools and lighting

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If you are not sure about the relay model, look in refrigerator passport or find the markings on the device itself. For example, start-protection relays Atlant are often designated as RTK-X4, DHR or LS-08B.

Step-by-step instructions: how to remove the start-up protection relay

The start-up protection relay is attached to the compressor and is usually covered with a plastic cover. To open it:

1. Unplug the refrigerator and move it away from the wall to access the back panel.

2. Remove protective cover compressor (if any) - it is secured with latches or one screw.

3. Carefully pull the relay up or to the side (depending on the model). It should come off the guides. If it does not give in, use a screwdriver plastic retainer.

4. Disconnect the wires, having previously photographed their location. Usually there are three of them:

   • 🔌 Common - connected to the compressor.
   • 🔌 Working (run) - comes from the plug.
   • 🔌 Start (start) - thick wire, often with contact-“tablet”.

⚠️ Attention: If, when removing the relay, you saw melted contacts or smelled burning, under no circumstances reinstall it! This is a sign of a short circuit - replacement is required.

What to do if the relay is “stuck” to the compressor?

If the plastic housing of the relay cannot be removed due to corrosion or deformation, do not apply force - this can break the compressor mount. Instead:

1. Treat the joint with WD-40 or alcohol.

2. Wait 5–10 minutes.

3. Gently rock the relay left and right while pulling up.

If that doesn’t help, cut off the plastic case with a knife (but do not damage the wires!).

How to open the thermostat inside the refrigerator

Thermostat in Atlant hidden behind the control panel. To get to it:

1. Turn off the refrigerator and remove all shelves/drawers from the upper chamber (if the relay is there).

2. Pry it with a screwdriver plastic cover with the thermostat handle. It is attached with latches - pull carefully so as not to break it.

3. Behind the cover you will see round thermostat with a capillary tube (thin metal hose). Disconnect the tube from the body without bending it.

4. Unscrew the screws securing the thermostat and remove the terminals from the wires (usually 2-4).

💡 Advice: If the capillary tube is damaged (broken, freon leaking), The thermal relay must be replaced - it cannot be repaired.

Refrigerator model	Thermal relay type	Location	Features
ATLANT XM 4021-000	K-59	Under the top panel	The capillary tube runs along the evaporator
MHM 1705-80	TAM-133	Behind the regulator handle	Attached with two screws
ATLANT XM 6025-031	Danfoss 077B6	Inside the freezer	Electronic relay, non-removable

Typical mistakes when opening a relay and how to avoid them

Even experienced craftsmen sometimes make mistakes that lead to breakdown of the refrigerator. Here are the most common ones:

• ⚡ Mixed up wires —if after assembly the compressor does not start, check the contacts match in your photo.
• 🔨 Too much force —the plastic relay mounts are fragile. It is better to spend time on careful removal than to break parts.
• 📉 Ignoring the test with a multimeter - even if the relay is apparently intact, it may be faulty. Ring the contacts in resistance mode.

⚠️ Attention: If, after installing a new relay, the refrigerator Atlant turns on for 1-2 seconds and turns off, the problem may not be in the relay, but in inter-turn compressor short circuit. In this case, winding diagnostics will be required.

Checking the relay after dismantling: what to do next

When the relay is removed, it needs to be checked for functionality. To do this:

1. Take a multimeter and set the mode calls.

2. For start-protective relay:

   • Ring the contacts 3 and 4 (numbers are usually indicated on the case). At room temperature, the resistance should be 20–40 Ohm.
   • If the device shows 0 (short circuit) or ∞ (open) - relay faulty.

5. For thermal relay:

   • Turn the regulator knob to position Max —the contacts should close (multimeter beep).
   • In position Off the contacts open.

If the relay does not pass the test, it must be replaced. For Atlant original parts (RTK-X4, K-59) or analogues from Danfoss, Emersonare suitable. The cost of a new relay is from 500 to 2000 rubles, depending on the model.

FAQ: Frequently asked questions about the Atlant refrigerator relay

Is it possible to repair the relay yourself, or only replacement?

Mechanical start-up relays (for example, RTK-X4) are sometimes repairable: you can clean the contacts with sandpaper or bend the bimetallic plate. However, electronic relays and thermostats cannot be repaired - only replacement.

How to understand that the relay has burned out and not the compressor?

If you hear a sound when you turn on the refrigerator click, but the compressor does not start, the relay is at fault. If there is no click at all, the problem may be in the compressor or broken windings. An accurate diagnosis is made after checking with a multimeter.

What to do if, after replacing the relay, the refrigerator works, but does not freeze?

It is probably faulty thermostat or freon leakage. Check:

• The correct connection of the thermostat capillary tube.
• The presence of ice on the evaporator (if there is none, there is not enough freon).
• Fan operation (in models with No Frost).

Where can I buy a relay for Atlant if there are no spare parts in the city?

Original relays can be ordered:

• On the website Atlant (section "Spare parts").
• In online stores like 220-Volt, All-Zap.
• Na Avito or Yule (check compatibility with your model!).

⚠️ Beware of fakes - cheap relays without markings often fail after 1-2 months.