How to select a relay for a refrigerator compressor: 5 key steps and mistakes that spoil equipment

When the refrigerator suddenly stops freezing or makes suspicious clicks, the culprit is often the compressor start-up relay. This small part is responsible for starting the motor and protecting against overloads, but its malfunction can result in costly repairs. Choose a relay for the refrigerator compressor is a problem faced by both craftsmen and equipment owners who decide to save on calling a specialist.

The problem is that there is no universal solution no: relays differ in type, power, manufacturer and even form of mounting. An error in choice will lead to the compressor either not starting or burning out from overheating. In this article we will look at how identify a relay malfunctionwhat parameters to consider when purchasing, and why even an original spare part may not be suitable. We’ll also reveal the secrets of craftsmen who save time on selection.

Signs of a relay malfunction: when it’s time to change it

Before you run to the store for a new relay, make sure that this is the problem. Refrigerator compressor may not work for many reasons: from freon leakage to thermostat failure. But there are symptoms that directly point to the relay:

• 🔊 Clicks without starting the motor. The relay tries to turn on the compressor, but it is “silent” or hums and immediately turns off.
• ⚡ The refrigerator does not cool, although the light inside is on and the fan (if any) is working.
• 🔥 The relay gets hot or smells burning. This is a sign of burning contacts or a short circuit.
• ⏱️ The compressor turns on with a delay (more than 5-10 seconds) or operates jerkily.

If at least one of these signs appears, compressor relay it’s worth checking with a multimeter. But before that, disconnect the refrigerator from the network and discharge the capacitor (if it is in the circuit) - it can store a dangerous charge!

Types of relays for refrigerators: which one is suitable for your compressor

Relays are divided into three main types, and each is compatible only with certain models of compressors. An error in choosing the type is the most common reason why a new relay does not work.

• 🔄 Posistor (PTR). Used in modern refrigerators (Samsung, LG, Indesit after 2010). Inside there is a posistor (thermistor), which heats up and opens the circuit when overloaded. It is these relays that most often fail due to voltage surges.
• 🧲 Induction (tablets). Classic for old models (Atlant, Biryusa, Stinol). They work on the principle of an electromagnet, are reliable, but sensitive to position (cannot be turned over!).
• 🔧 Electronic. Installed in premium refrigerators (Liebherr, Bosch) and inverter compressors. They are controlled by a microcircuit, often built into the control board.

How to determine the type of your relay? Inspect its body:

• If you see a black cylinder with wires it is a posistor.
• If round metal “tablet” it is induction.
• If the relay soldered into the board or has an electronic microcircuit.

Relay parameters: what you must check before purchasing

Even if the relay type is the same, it may not fit the technical specifications. Here 5 key parameterswhich coincide with the compressor data:

1. Rated current (indicated in amperes, for example, 1.2 A). Should be not lowerthan that of the compressor.
2. Compressor power (in watts or horsepower). For household refrigerators, usually 120–180 W.
3. Mounting type. The relay can be mounted with bolts, latches, or simply inserted into the connector.
4. Number of contacts. PTC relays have 3–4, induction relays have 2–3.
5. Compressor manufacturer. The relay for Embraco will not fit Secop (former Danfoss).

Where can I get this data? They are indicated:

• 🏷️ On compressor sticker (usually black, on the motor itself).
• 📄 In refrigerator passport (section "Technical Specifications")
• 🔍 On case of the old relay (if it has not burned out completely).

How to decipher compressor marking?

For example, the inscription Embraco EGX 120HL means:

- EGX — compressor series;

- 120 — approximate chamber volume (120 liters);

- H — high-temperature (for the refrigerator compartment);

- L —low noise.

Look for a full explanation in the brand's technical documentation.

Step-by-step instructions: how to select a relay according to the refrigerator model

If you are not a master, the easiest way is to find a relay by refrigerator model. Here is the algorithm of actions:

1. Find the refrigerator model. It is indicated on the sticker inside the chamber or on the back wall (for example, Atlant MHM 1705-00).
2. Check the compressor model. It is written on its body (for example, Secop (Danfoss) NL6H12T).
3. Enter the data in the search engine with the request: [refrigerator model] compressor relay original or [compressor model] start-up relay.
4. Compare photos. The original relay should look identical to the old one (shape, color, location of contacts).

If the original relay cannot be found, look analogs. To do this:

• 🔍 Use spare parts catalogs: Partmaster, All-Spares, Spare parts for refrigerators in the Russian Federation.
• 📞 Call the brand's service centers (for example, for Samsung or Indesit) - they will select a compatible replacement.

Took a photo of the old relay and compressor✅

Checked rated current and power✅

I specified the type of relay (posistor/induction)✅

The found analogue has the same contacts✅

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⚠️ Attention: If your refrigerator was manufactured before 2005, the original relays may no longer be produced. In this case, the technician will select a universal relay with suitable parameters, but it will have to be modified (for example, change connectors).

Top 5 mistakes when replacing a relay: why the new one does not work

Buying a relay is half the battle. Even if the parameters are the same, it may not be installed correctly. Here the most common mistakes and their consequences:

• 🔌 Incorrect connection of contacts. If you mix up the wires, the compressor will work in the opposite direction (which is physically impossible) or will burn out. Posistor relays sensitive to polarity!
• 🔧 Poor contact. Oxidized or loose terminals lead to heating and failure of the relay.
• 🔄 Using a relay from another compressor. Even if they are similar in appearance, the difference in currents or resistance of the posistor will lead to breakdown.
• 📉 Ignoring the compressor check. If the motor is jammed or has a short circuit, the new relay will burn out immediately after switching on.
• 🔥 Lack of grounding. In refrigerators with a metal body, this can cause an electric shock when touched.

How to avoid these errors?

• 📸 Take a photo of the connection diagram Before removing the old relay.
• 🔍 Check the compressor with a multimeter (winding resistance should be within 20–50 Ohm).
• 🛠️ Use heat shrink tube to insulate the contacts.

Where to buy a relay: stores, prices and how not to run into trouble counterfeit

Relays for refrigerators are sold in four types of points:

• 🏬 Brand service centers (for example, Atlant-Service, Samsung Service). Plus: guarantee of the original. Minus: the price is 30-50% higher than the market.
• 🛒 Spare parts stores (220 Volt, All-Spares, Platan). Plus: a wide range of analogues. Minus: risk of counterfeits.
• 🌍 Online platforms (AliExpress, Yandex Market, Ozon). Plus: low prices. Disadvantage: long delivery and difficulties with returns.
• 👨🔧 Repair technicians. Plus: they will select and install. Minus: extra charge for work.

Average prices for relays (2026):

• Original posistor: 800–1500 ₽.
• Universal induction: 500–900 ₽.
• Analogue for popular models (Atlant, Indesit): 300–600 ₽.

⚠️ Attention: On AliExpress they often sell relays without markings or with fake logos Embraco/Secop. Check reviews and ask the seller for a certificate of conformity. Original relays always have a hologram or engraved logo.

Frequently asked questions about relays for refrigerators

Is it possible to install a relay from another refrigerator if it looks the same?

No, even if the relay looks identical, its parameters (current, posistor resistance) may not match. This will lead to. the compressor will overheat or will not start. The exception is universal relays with adjustable current, but they need to be adjusted.

How to check the relay with a multimeter?

1. Set the multimeter to resistance testing mode (200 Ohm).

2. Ring the relay contacts:

- Between 1 and 2 (winding) the resistance should be 30–100 Ohm.

- Between 1 and 3 (contacts) - 0 Ohm (closed) in a cold state.

3 If the values are very different - relay. faulty.

Why does the new relay burn out immediately after installation?

This happens due to:

• Short circuit in the compressor windings (check the resistance).
• Incorrect connection (phase/zero are reversed for posistor relay).
• Power surges in the network (install a stabilizer).

What should I do if I can’t find a relay for an old refrigerator?

In this case:

1. Contact the workshop - they can make an analogue from a universal one relay.
2. Buy a used relay from Avito or Yule (check with the seller which refrigerator it was removed from).
3. Replace the compressor along with the relay (relevant if the refrigerator is more than 15 years old).

Is it possible to repair the relay with your own hands?

Induction relays can sometimes be repaired: it is enough to clean the contacts or replace the spring. The posistor relays cannot be repaired - they only need to be changed. Electronic relays require soldering and diagnostics of the board, which is only possible. to the technician.