What compressors are installed on a Liebherr refrigerator: complete analysis

Refrigeration equipment of the German brand Liebherr is deservedly considered the standard of reliability and manufacturability on the world market. However, even the most advanced technology is subject to wear and tear, and the heart of the refrigeration unit— compressor — may require attention or replacement over time. Owners often wonder which engine is installed in their model, especially when planning repairs or purchasing spare parts. Understanding the specifics of the components used is critical for proper maintenance.

The company's engineering policy has undergone significant changes over the past decades. If the old models were dominated by classic piston units, modern lines are increasingly equipped with inverter systems. Secop (formerly Danfoss), Embraco and their own developments - these are the main players whose logos can be found on the bodies of Liebherr motors. The differences between them are significant not only in price, but also in operating principles, noise level and maintainability.

In this article we will look in detail at what types of compressors are found in Liebherr refrigerators, how to identify them by appearance and markings, and also consider typical problems that users encounter. Knowing these nuances will help you avoid unnecessary costs for service and choose the right replacement in case of breakdown.

Main manufacturers of compressors for Liebherr

For many years, Liebherr did not produce compressors on its own, but purchased them from the world's leading specialized factories. The most widespread supplier for a long time was the Danish company Danfoss, which later reorganized its division of household compressors into a brand Secop. It is these units that can be found in the vast majority of classic Liebherr refrigerator models produced before the introduction of mass inverter technologies.

The second major supplier is the Brazilian corporation Embraco. These compressors were often installed in more powerful models or in refrigerators designed to operate at elevated ambient temperatures. A distinctive feature of such motors is often a slightly higher operating current and a specific housing shape. Also, in some industrial or built-in series there could be units from Aspera (now also part of Secop) or Tecumseh, although this happens much less frequently.

⚠️ Attention: When buying a replacement compressor, never focus only on the brand of the refrigerator. The same Liebherr model could have completely different engines in different years of production. Always check the markings on the nameplate of the old unit.

The modern trend dictates its own rules, and now Liebherr is actively switching to the use of inverter compressors, often labeled as Linear Inverter. Large OEM partners are involved in the production of such components for the German brand, but the technology and quality standards are strictly controlled by Liebherr engineers. This allows you to achieve the highest energy efficiency class A+++.

Classic piston compressors Secop (Danfoss)

Secop piston compressors, which for many years were supplied under the name Danfoss, are the “workhorses” in the world of refrigeration technology. In Liebherr refrigerators they have proven themselves to be extremely reliable and durable devices. Structurally, they are a sealed casing, inside which there is an electric motor and a piston group operating on the principle of reciprocating motion.

A characteristic feature of these units is the presence of a starting relay and a protective thermal relay, which are attached externally to the three contacts of the compressor. Depending on the motor power, Liebherr refrigerators could use different types of relays: posistor (PTC) for models of lower power or relays with a starting capacitor for more powerful two-compressor systems. Refrigerant in such systems, R600a (isobutane) was most often used, which requires special care during repairs due to its flammability.

Why is Secop called Danfoss?

The Danish company Danfoss sold its hermetic compressor division to Secop Corporation in 2010. Therefore, compressors released after this date may have the Secop logo, but structurally and technically they are direct descendants of the legendary Danfoss BD and NLB series. For Liebherr refrigerators, this makes no practical difference when selecting analogues.

Among the advantages of the classic Secop piston models installed on Liebherr, we can highlight:

• 🔧 High maintainability and availability of spare parts (relays, capacitors).
• 🔊 Predictable level of noise and vibration, characteristic of piston systems.
• ❄️ Excellent cooling performance even at high condensation temperatures.
• 💰 Lower cost compared to inverter analogues.

Despite the reliability, such compressors have an on-off life. Mechanical parts are subject to wear, and the electric motor windings can burn out due to frequent power surges if stabilizing equipment is not installed. In Liebherr refrigerators, the service life of such units often exceeds 10-15 years, provided they are used correctly.

New generation inverter systems

With the development of requirements for energy efficiency and noise levels, Liebherr began to introduce inverter compressors en masse. Unlike classic models that operate in “start-stop” mode (turned on at full power, cooled, turned off), inverter motor is able to smoothly regulate its rotation speed. This allows you to maintain the set temperature in the chambers with minimal fluctuations.

Modern Liebherr models, such as the Comfort, Premium and GrandCruseries, use inverter compressors, often manufactured to order from the German company. They are compact in size and mounted on rubber dampers to reduce vibration. Such motors are controlled through a complex electronic board that analyzes data from many sensors inside the refrigerator.

Key features of Liebherr inverter systems:

• 🤫 Quiet operation: no characteristic switch-on click or hum at start-up.
• ⚡ Energy savings of up to 40-50% compared to conventional motors.
• 🌡️ Precise temperature maintenance without changes, which is useful for storing food.
• 📉 Fewer start cycles, which theoretically extends the service life of the mechanics.

However, inverters also have their weak points. They are extremely sensitive to the quality of the electrical network. Voltage surges can damage not the compressor itself, but the control board or inverter module built into the casing. Repair of such components requires high qualifications and special diagnostic equipment, and the cost of spare parts is much higher than that of piston analogues.

How to determine the model and characteristics of the compressor

To accurately identify the compressor installed in your Liebherr refrigerator, you need to gain access to the technical compartment. In most models it is located at the back, at the bottom of the case. You will need to remove the protective plastic cover or cardboard panel, which is usually secured with latches or a few screws. Before starting work be sure to disconnect refrigerator from the mains.

There is a sticker or embossed marking on the metal casing of the compressor. These data are the ultimate truth. You should be interested in the following parameters: compressor model (for example, Secop NLB11FB, Embraco EG80CLH), refrigerant type (R600a or R134a), amount of oil and its type, as well as electrical characteristics (voltage, frequency, current).

Often on Liebherr compressors you can find the following designations depending on the year of manufacture:

If the markings are erased or unreadable, you can try to determine the model by the appearance of the starting relay and the location of the tubes, but this is a less reliable method. In such cases, it is better to contact an official Liebherr dealer, citing the full serial number of the refrigerator, which is indicated on the inside wall or on the end of the door.

Typical faults and diagnostics

Despite the high quality of the build, compressors in Liebherr refrigerators may fail. The most common problem with classic piston models is turn-to-turn short circuit windings or open circuit. This manifests itself in the fact that the motor hums, tries to start, clicks the relay, but after a few seconds it turns off due to thermal protection. In this case, the case may be hot.

Another common problem is loss of performance (“does not pump”). The compressor runs continuously without turning off, but the temperature in the chambers does not drop to the required values. This may be caused by wear of the piston group, valves, or refrigerant leakage through the seals. In the case of inverter models, symptoms are often associated with electronic errors: the refrigerator may not start at all or display an error code on the display.

⚠️ Attention: If you hear a loud metallic knock or clanging sound when the Liebherr compressor is running, immediately turn off the appliance. This may indicate destruction of the internal engine suspension or valve system. Further work will lead to complete failure of the unit.

Diagnostics should begin by checking the voltage in the outlet and the integrity of the power cord. Then the starting relay is checked (for piston models) - often the problem lies precisely in a burnt-out posistor or a jammed contact. If the relay is working properly, but the motor does not start or the circuit breaker knocks out, most likely the compressor itself is faulty.

Replacement cost and repair features

Replacing a compressor in a Liebherr refrigerator is a complex technological process that requires special equipment. Unlike replacing a filter or lamp, this requires vacuumization systems, precise charging of refrigerant by weight and sealing of copper tubes. Doing this work independently without skill and tools (vacuum pump, pressure gauge station, burner) is almost impossible and dangerous.

The cost consists of the price of the compressor itself and the work of the technician. Original Liebherr compressors (or their direct analogues Secop/Embraco) are more expensive than their universal Chinese counterparts, but guarantee compliance in terms of cooling performance and noise. Inverter models can cost 2-3 times more than conventional piston models. It is also worth considering that when replacing a compressor, it is often necessary to replace the filter-drier and flush the system if there were winding combustion products in it.

When deciding on repairs, it is worth considering the age of the refrigerator. If the equipment is more than 10-12 years old and the inverter compressor has failed, it may be more economically feasible to purchase a new model, since the cost of repairs can reach 50% of the price of a new device. For classic models, replacing the compressor often extends the life of the refrigerator by another 5-7 years.

Frequently asked questions (FAQ)

Is it possible to replace the Secop compressor with an analogue from another brand in a Liebherr refrigerator?

Technically it is possible if the overall dimensions, seats, power (or cooling capacity in W) and type of refrigerant are the same. However, Liebherr engineers select compressors for a specific heat exchanger capacity. Installing a more powerful or weaker analogue can lead to incorrect operation of the system, freezing or overload. It is better to look for the original or a complete cross-analog using the correspondence table.

Why does a Liebherr refrigerator hum loudly after replacing the compressor?

There may be several reasons: the type of compressor was incorrectly selected (for example, they installed it for R134a instead of R600a), the motor was poorly secured (vibration is transmitted to the housing), or air remained in the system (poor vacuumization). Also, the new compressor may have a slightly different acoustic profile, which you need to get used to, but a strong hum is a sign of a problem.

How long does the compressor in a Liebherr refrigerator last on average?

The average service life of Secop/Danfoss piston compressors under normal operating conditions and stable voltage is 10-15 years or more. Inverter compressors have a longer stated service life (up to 20 years), but they are more vulnerable to external factors, such as voltage fluctuations in the network and overheating due to a dirty condenser at the back.

Where is the serial number of the Liebherr compressor?

The serial number and model are stamped on a metal tag glued to the case compressor. To get to it, you need to remove the back cover of the refrigerator at the bottom. Sometimes the markings are lasered directly onto the metal of the casing. It is impossible to see this data without removing the cover.