A two-chamber refrigerator is a reliable technique, but even it requires maintenance over time. One of the common problems is a malfunction of the compressor start-up relay, which is responsible for starting the motor and protecting against overloads. If the refrigerator does not turn on, hums, but does not freeze, or turns off cyclically after a few seconds, the relay may be the culprit. Atlant two-chamber is a reliable technique, but even it requires maintenance over time. One of the common problems is a malfunction of the compressor start-up relay, which is responsible for starting the motor and protecting against overloads. If the refrigerator does not turn on, hums but does not freeze, or turns off cyclically after a few seconds, the relay may be the culprit.
Removing the relay from the compressor Atlant with your own hands is possible if you act carefully and follow the instructions. This article contains a step-by-step analysis of the process with photos, connection diagrams, as well as tips for diagnostics and replacement. We took into account the features of two-chamber models MHM-1705, MHM-1842 and similar ones, where the relay is attached in a standard way.
Important: if you are not If you are confident in your abilities or the refrigerator is under warranty, it is better to contact the service. But for those who are ready to figure it out on their own, these instructions will help you save on repairs.
Symptoms of a malfunction of the Atlant refrigerator compressor relay
Before removing the relay, make sure that it is the problem. Typical symptoms of a malfunction:
- 🔊 Refrigerator buzzes, but does not start - the compressor tries to start, but the relay does not make contact.
- ⚡ Cyclic clicks with an interval of 5-10 seconds - the relay tries to start the motor, but works protection.
- ❄️ The compressor is running continuously without stopping —thermal protection does not work.
- 🔥 Hot relay body —a sign of a short circuit or overheating windings.
The same symptoms may indicate a malfunction compressor or thermostat. To exclude other causes, check:
- 🔌 Presence of voltage in the socket (connect another device).
- 📏 Correct installation of the refrigerator (tilting forward/backward can block the door).
- 🌡️ Operation of the thermostat (turn the knob to maximum - if the compressor does not start, the problem may be there).
If the symptoms match, it’s time to remove the relay for diagnostics or replacement. But first, prepare your tools and ensure safety.
Preparing for dismantling: tools and safety measures
For work you will need:
- ⚒️ Phillips screwdriver (usually PH2).
- 🔧 Flat screwdriver (for prying fasteners).
- 📸 Smartphone —to photograph the wiring diagram.
- 🧲 Marker or stickers —for marking wires.
- 🧤 Dielectric gloves (optional, but recommended).
Protect yourself and your equipment:
⚠️ Attention: Before starting work unplug the refrigerator and wait until the capacitor is discharged (10-15 minutes). The capacitor can store dangerous voltage even after being turned off!
Unplug the refrigerator
Wait 15 minutes for the capacitor to discharge
Take a photo of the wire connection diagram
Prepare tools and markers
Give access to the compressor (remove the back panel if necessary)-->
If your Atlant with the system No Frost, please note that the compressor can be covered with an additional panel. In classic models (drip system), access is easier - just remove the bottom cover.
Where is the relay located on the compressor of the Atlant refrigerator
In two-chamber refrigerators Atlant the relay is located on the compressor housing —black cylindrical block at the bottom of the rear wall. It is attached to the compressor using:
- 🔗 Metal clamp (in old models).
- 🔩 Plastic clamp (in new ones, for example, MXM-1705-80).
- 🔌 Plug connector with 3–4 wires.
Typical connection diagram (may differ depending on models):
| Wire | Color | Purpose |
|---|---|---|
| 1 | Brown/Black | Phase (220V power supply) |
| 2 | Blue | Zero |
| 3 | Red/Orange | Compressor start winding |
| 4 | Yellow-green | Ground (if any) |
The photo below shows a typical relay location (marked in red) on the compressor Atlant:
Photo of the relay location (description)
A rectangular plastic relay is installed on the compressor (black cylinder) on the right or top form. 3-4 wires are attached to it, secured with a plastic clip. In some models, the relay is covered with a protective casing that needs to be removed.
If your model is different, check with refrigerator passport or take a photo before disconnecting the wires.
Step-by-step instructions: how to remove the relay from the compressor
Follow the algorithm to avoid damaging the wires and contacts:
- Unplug the refrigerator. Unplug the plug from the socket.
- Remove the back panel. In most cases models Atlant it is attached to 4-6 screws. Carefully set it aside.
- Find the compressor and relay. The compressor is a black cylinder with tubes, the relay is a small box on it.
- Take a photo of the wire connection. This will help connect them back correctly.
- Disconnect the wires.
- If the wires secured with a retainer —carefully press it out with a flat-head screwdriver.
- If connected terminals —loosen the screws with a Phillips screwdriver.
- In models with clamp —unscrew the fastening screw.
- In models with latch —pry it with a screwdriver and pull the relay up.
Important: Do not pull the wires - they can come off the relay terminals. Hold only the relay body.
After removal, inspect the relay for:
- 🔥 Blackened or melted contacts a sign of a short circuit.
- 💧 Traces of corrosion —may indicate moisture ingress.
- 🔊 Cracks on the body —the relay must be replaced.
How to check a removed relay for functionality
Before buying a new relay, make sure that the old one is really faulty. To check you will need a multimeter.
Diagnostic procedure:
- Ring the contacts.
- Set the multimeter to mode
200 Ω. - Connect the probes to the contacts 3 and 4 (starting and operating windings). The resistance should be 20–40 Ohm.
- Between 1 and 2 (phase and zero) the resistance should be infinite (open circuit).
- Set the multimeter to mode
- Switch the multimeter to
2000 Ω. - Measure the resistance between 1 and 3 contacts. Normal: 100–300 Ohm.
If the readings differ from the norm, the relay is faulty. Also inspect bimetallic plate inside the relay (if the housing is collapsible):
- 🔍 It should be solidwithout cracks.
- 🔥 If the plate is deformed —the relay needs to be replaced.
How to install a new relay on a compressor
If the relay is faulty, replace it with a similar one. For refrigerators Atlant relays of the following types are suitable:
- 🔧 RTK-X (for compressors Danfoss).
- 🔧 RTP-1 (universal, for most models).
- 🔧 DANFOSS 103N0210 (original for new Atlant).
Installation procedure:
- Compare marking old and new relays. They must match by:
- Trigger current (for example,
3.5–5.0 A). - Type of fastening (clamp/latch).
- Number of contacts (3 or 4).
- Trigger current (for example,
- Secure the housing (with a clamp or latch).
- Connect the wires according to photodone earlier.
- Make sure that wire lock is latched all the way.
After installation, turn on the refrigerator and check:
- ✅ The compressor starts without clicks.
- ✅ The relay does not heat up (maximum warm after 10 minutes of operation).
- ✅ The refrigerator is gaining temperature (check after 1-2 hours).
⚠️ Attention: If after replacing the relay the refrigerator the compressor does not turn on or the protection is triggered. data-i="244">Common mistakes when removing and replacing relays —the problem may be compressor. Do not try to turn it on repeatedly: this will lead to overheating of the windings.
Common mistakes when removing and replacing relays
Even experienced craftsmen sometimes make mistakes. Here's what you can't do:
- 🔌 Connect wires at random - this can burn the compressor or relay!
- 🔧 Use a relay from another model —even if it looks similar, the response parameters may differ.
- 💡 Check the relay without disconnecting capacitor —the residual charge can damage the multimeter.
- 🔨 Use force when removing —plastic clips are fragile and easy to break.
Also avoid:
- 🔥 Soldering wires directly —this violates safety and warranty (if applicable).
- 🧲 Use metal tools without insulation risks a short circuit.
If you are in doubt about the correct connection, contact electrical diagram your model. It is usually stuck on the back panel of the refrigerator or in. passport.
FAQ: Frequently asked questions about the Atlant refrigerator relay
Is it possible to repair the relay or just change it?
In most cases, the relay do not repairand replace. The exception is if the problem is in oxidized contacts (they can be cleaned with sandpaper). It is impossible to repair a bimetallic plate or coil at home.
What relay current is suitable for Atlant MXM-1842?
A relay with operation current 3.5–5.0 A. Optimal options: RTP-1 or DANFOSS 103N0210. Check the parameters according to the markings on the old relay.
What to do if after replacing the relay the compressor does not start?
Possible reasons:
- Incorrect wire connection (check in photo).
- Compressor malfunction (needs checking multimeter).
- Problem with the thermostat or control board.
Disconnect the refrigerator and repeat the diagnostics.
How much does a new relay cost for Atlant?
The price depends on the type:
- Universal RTP-1: 500–800 rub.
- Original DANFOSS: 1000–1500 rub.
- Analogs (for example, Lg Electronics): 600–1200 rubles.
Buy in trusted stores (for example, 220-volt, AllInstruments.ru) and check the labeling.
Is it possible to start a refrigerator without a relay to check the compressor?
Absolutely not! The relay protects the compressor from overheating. Without it, the motor will burn out in a few minutes. For a short-term test, use starting relay from other equipment with similar parameters.