German brand refrigerators Liebherr deservedly considered the standard of reliability in the segment of premium household appliances. However, even the most advanced equipment requires maintenance over time, and the heart of any refrigeration chamber - the compressor - is no exception. Owners often wonder about the origin and type of installed unit, especially when faced with the need to repair or replace a failed unit.
Unlike budget brands, where suppliers can change depending on the batch, Liebherr engineering philosophy implies the use of time-tested components from the world's leading manufacturers. Understanding exactly what type of engine is installed in your model is critical for selecting analogues and correctly diagnosing faults. In this article we will analyze in detail the evolution of compressor units in the equipment of this brand.
The modern spare parts market is overflowing with offers, but not all of them meet the high quality standards of the original components. Original Liebherr compressors often have specific markings and mounting design features that distinguish them from mass-produced analogues. Therefore, before purchasing a spare part, it is necessary to accurately identify the current device in order to avoid problems with installation or performance.
Main suppliers and types of compressors
For decades, the main partner of Liebherr has been the Danish corporation Danfoss (now Secop). It is these units that can be found in the vast majority of classic two-chamber models released before the mid-2010s. They have established themselves as “workhorses” capable of functioning for years without the intervention of service departments.
With the development of technology and tightening environmental standards, the brand began to implement more complex systems. In particular, models with inverter controlhave appeared, which allow you to smoothly regulate engine power. This reduces noise levels and energy consumption, which is a key factor for class A++ and A+++ equipment.
It is worth noting that in some specific series, especially built-in or compact ones, units from other manufacturers could be used, such as Tecumseh or Aspera. However, their share in total production is much smaller. Below is a list of the most common characteristics:
- 🔧 Secop (Danfoss): Classic piston compressors, known for their maintainability and availability of spare parts.
- ⚡ Inverter systems: Brushless motors with electronic speed control, ensuring quiet operation.
- 🌍 Environmentally friendly: All modern units are adapted to work with R600a (isobutane) refrigerants.
- 🔊 Noise level: New models are much quieter than their predecessors thanks to an improved engine suspension system.
⚠️ Attention: When ordering spare parts according to the catalog Always check the installation dimensions with the number of the old compressor. Even if the electrical parameters are the same, the geometry of the case may differ, which will require modification of the fasteners.
Inverter technologies versus classics
The division into classic and inverter models is not just a marketing ploy, but a fundamental difference in design and operating principle. Classic single-speed compressor works on the “on-off” principle. It starts at full power, cools the chamber to the set temperature and turns off until the next cycle. This creates temperature differences and a characteristic click at startup.
In turn, inverter motor does not turn off completely. Once the target temperature is reached, it reduces the speed to a minimum, maintaining the cold at a constant temperature. This avoids power surges in the network and reduces wear on mechanical parts, since there are no constant starting currents.
However, inverter systems also have their own operating features. They are more sensitive to power quality and power surges in the network. If the light in your home often “jumps”, it is recommended to use a stabilizer to protect the expensive compressor control electronics.
Fault diagnosis is also different. If a classic unit can often be “revived” by replacing the starting relay or capacitor, then in inverter systems the control module itself or the motor winding most often fails, which requires a complete replacement of the unit.
How to find out the model of the installed compressor
Identifying the device is the first step to successful repair. There is an information sticker on the body of every Liebherr refrigerator, regardless of the year of manufacture. It is usually located inside the refrigerator compartment on the side wall or at the end of the door. However, the information on it may be general for the entire model of the refrigerator, and not a specific unit.
To find out the exact model of the compressor, you need to gain visual access to the unit itself. To do this, unplug the refrigerator, move it away from the wall and remove the rear metal or plastic panel at the bottom. A nameplate with technical data is stamped on the metal housing of the motor.
You should be interested in the following parameters:
- 🏷️ Model: For example, BD35F, TL43G or a specific Liebherr code.
- ❄️ Refrigerant type: Must match that is charged in the system (usually R600a).
- 🔌 Voltage and frequency: Standard 220-240V / 50Hz.
- 📏 Dimensions: Height, width and depth of the housing to check compatibility.
Sometimes the factory sticker on the compressor may be filled with oil or damaged by corrosion. In such cases, experienced craftsmen focus on the appearance of the starting equipment and the shape of the case, but for the average user this can be difficult.
☑️ Check before replacement
Compatibility and characteristics table
To simplify the search for information, we have prepared a summary table reflecting the typical characteristics of compressors installed during different periods of production of Liebherr equipment. This will help you navigate the variety of models.
| Production period | Compressor type | Probable manufacturer | Refrigerant |
|---|---|---|---|
| Until 2005 year | Piston, single-speed | Danfoss / Secop | R134a / R600a |
| 2005 – 2015 | Piston, optimized | Secop / Embraco | R600a |
| 2015 – present | Inverter / Piston | Secop / Own development | R600a |
| Built-in series | Compact piston | Aspera / Tecumseh | R600a |
It is important to understand that the table is for reference only. Within the same model range, a manufacturer could use different components depending on the availability of components on the global market. Therefore, a visual check is always a priority over theoretical data.
If you are planning a replacement, pay attention not only to the power, but also to the diameter of the fittings of the suction and discharge tubes. For different manufacturers, these dimensions may differ by fractions of a millimeter, which will create problems during soldering.
Is it possible to install a compressor of a different power?
Theoretically, it is possible if the fasteners match. However, installing a more powerful motor will lead to incorrect operation of the automation and possible defrosting of food, while a less powerful one simply will not cope with the load in the heat.
Typical faults and diagnostics
Despite their high quality, Liebherr compressors are not immune to breakdowns. The most common reason for failure is interturn short circuit motor windings. This occurs due to voltage surges or natural aging of the insulation. Symptoms are a buzzing sound without starting or constant knocking out of plugs.
The second common problem is jamming of the piston group. This often happens after a long period of equipment downtime or when the tightness of the circuit is broken when moisture gets inside the system. Moisture reacts with oil, forming an acid that corrodes parts.
It is also worth mentioning the malfunction of the start-up relay. This is an inexpensive element that protects the engine. If the refrigerator hums for 5-10 seconds, then there is a click and silence, most likely the problem is in the relay or capacitor, and the compressor itself may be working.
⚠️ Attention: Never try to start a “jammed” compressor by applying voltage directly bypassing the relay. This is guaranteed to lead to burning of the windings and will make the unit beyond repair.
Diagnostics should begin by measuring the resistance of the windings with a multimeter. Normal values vary depending on the model, but are usually between 10 and 30 ohms for the run winding and slightly more for the start winding. If the device shows a break or zero, the engine is faulty.
Replacement cost and feasibility of repair
The issue of economic feasibility of repair is always acute. Original compressors for Liebherr are not cheap, and to their price it is necessary to add the cost of evacuation of the system, refilling with freon and replacing the filter-drier. In total, repairs can amount to up to 50% of the cost of a new refrigerator.
However, given the overall reliability of the rest of the structure (chambers, plastic, electronics), replacing the compressor is often a reasonable solution. High-quality repairs can extend the life of equipment for another 7-10 years.
When making a decision, consider the age of the device. If your refrigerator is over 15 years old and has worn out door seals or electronic problems, it may be easier to consider purchasing a new model. Modern units will save energy and operate more quietly.
FAQ: Frequently asked questions
Is it possible to replace the Danish Secop with a Chinese one analogue?
Technically this is possible if the dimensions, power and type of refrigerant are the same. However, Chinese compressors often operate louder and have a shorter lifespan. For expensive Liebherr equipment, it is better to look for the original or high-quality European analogues.
Why does the refrigerator freeze poorly after replacing the compressor?
Most likely, the technology for vacuuming the system was broken or the dosage of refrigerant charging was incorrectly calculated. Also, the reason may be a clogged capillary tube, which needed to be washed or replaced along with the compressor.
Is the compressor getting very hot - is this normal?
The operating temperature of the compressor housing can reach 70-90 degrees, so it can be hot to the touch. The alarm should be sounded if the unit is so hot that it is impossible to touch it, or if it does not cool down even in idle mode.
Where to buy an original compressor for Liebherr?
Original spare parts are best ordered from the brand’s authorized service centers. There are many refurbished or counterfeit units on the market that are passed off as new. Always ask for a warranty on the spare part.