Determination of the exact date of manufacture of household appliances often becomes a critical point when attempting warranty repairs or purchasing used equipment. Many owners are faced with a situation where a seller or service center asks for a serial number, claiming that it can be used to determine the age of the device. This is true, but the decoding process is not always obvious to the average user.
Unlike food products, where the expiration date is printed in large font, refrigeration equipment manufacturers encode this information in long alphanumeric sequences. Serial number (S/N) is a unique identifier that carries data about the manufacturer, model, case color and, most importantly, build date. Understanding the encoding logic will help you avoid being deceived when buying equipment secondhand.
In this article we will analyze in detail the labeling algorithms for the most popular brands on the market. You will learn to find the necessary numbers and correctly interpret their meaning in order to know exactly how many years the unit has served your home.
Where to look for markings and serial numbers
The first step is always to physically search for a nameplate or sticker with technical information. Manufacturers place this information in standard places, but their location may vary depending on the design of the refrigerator compartment and the year of manufacture of the model.
Most often, the information sticker is located inside the main refrigerator compartment. Pay attention to the side wall (left or right), sometimes it can be located on the upper internal partition or even on the door. In some models, especially built-in ones, the sticker is hidden behind the base or on the back wall of the case, which requires moving the equipment away from the wall.
⚠️ Attention: Never try to peel off or damage the factory markings. The absence of a readable label with a serial number is a legal basis for refusal of warranty service by the manufacturer.
If there is no sticker inside the chamber, check the back wall of the refrigerator. There is often a metal plate or a thick sticker containing all the necessary data, including model and serial number. Also, a duplicate of this information is almost always available in the technical data sheet of the device and on the (box) if you have saved the packaging materials.
The combination you are looking for is usually designated as S/N, Serial No, Ser-No or simply “Serial number”. It consists of 9–16 characters. It is this code that we have to decipher.
Deciphering codes from manufacturers Samsung and LG
Korean electronics giants use a fairly logical, but different coding system. For Samsung and LG, the production date is often “hard-wired” at the beginning or end of the serial number, but the formatting may vary depending on the decade of manufacture.
Most modern models Samsung the serial number begins with two letters followed by numbers. The year of manufacture is coded by the letter or number following the model prefix. For example, if the number begins with HS, then the year of manufacture may be indicated by the following number or letter, depending on the specific series. However, a more reliable method is to look for a direct date format YYYY.MM.DDwhich is sometimes printed separately next to the barcode.
The company LG often uses the first two digits of the serial number to indicate the year and month. For example, if S/N starts with 210..., it could mean 2021, 10th month (October). However, in older models the logic could be reversed or biased. It is important to pay attention to the first 3-4 characters.
- 🔍 Samsung: Look for a combination of 4 digits at the beginning or end of the line, often indicating the year and month (YYMM).
- 🔍 LG: The first two digits often indicate the year, the third and fourth - the month of production.
- 🔍 General: For both brands, the date can be entered in a separate field"Manufacturing Date" next to the barcode.
It is worth remembering that in recent years manufacturers have sought to unify markings by adding an explicit indication of the date in the YYYY-MM-DD format next to the main serial number to make life easier for service departments.
Marking of Bosch, Siemens refrigerators and Liebherr
The German engineering school is famous for its pedantry, and the coding system of the BSH (Bosch, Siemens) and Liebherr brands is no exception. Here, the production date is usually encrypted at the very beginning of the serial number. The serial number most often consists of 10 digits. The first four digits are the production date code. The first digit indicates the year (last digit of the year), the second and third indicate the month, and the fourth indicate the day. For example, code
U Bosch And Siemens The serial number most often consists of 10 digits. The first four digits are the production date code. The first digit indicates the year (last digit of the year), the second and third indicate the month, and the fourth indicate the day. For example, code 9091... means September 2019 (or 2009, which needs to be specified according to the model), the 1st day. However, a more common format is where the first two digits are the year and the next two are the week of production (WW).
Brand Liebherr uses a similar approach. In a serial number, which usually begins with letters, the date is encoded in numbers immediately after the letter prefix. For example, in the number CS2841... numbers 28 can mean the 28th week, and the next digit is the year. The exact decoding depends on the specific series, but the “beginning of line” principle works in 90% of cases.
⚠️ Attention: For German brands, the numbering of weeks goes from 01 to 52 (or 53). If you see the numbers 53, this is not an error, but a feature of the calendar of a particular year of manufacture.
For an accurate check, you can use official calculators on the manufacturers' websites by entering the full Serial number. This will eliminate errors in the interpretation of the week format.
Why is the production week important?
The production week is important to determine the compatibility of spare parts. Within one model year, the manufacturer may make design changes to the compressor or defrost system, and parts from a refrigerator assembled in the 1st week may not fit the unit from the 50th week.
How to read the code on Indesit, Ariston and Hotpoint refrigerators
Branded appliances Indesit, Ariston i Hotpoint (formerly owned by the Indesit Company group, now Whirlpool) uses a system where the production date is often encoded in the first characters of the service number.
The serial number on these models usually begins with two letters, followed by a long numerical sequence. The clue lies in the numbers coming immediately after the letters. The first digit indicates the year of production (the last digit of the year), and the two following digits are the number of the week in the year.
For example, if the code begins with CI 320..., then:
- 📅 The digit
3 indicates a year ending in 3 (2013, 2003 or 2023).
- 📅 The numbers
20 indicate the 20th week of production (May).
To determine the decade (2000s or 2010s), you need to compare the year with the appearance of the model, the design of the control panel and the year such a series appeared on sale. A refrigerator with a design from the early 2000s is unlikely to be released in 2023.
Sometimes, especially on new models, the manufacturer duplicates this information in a more readable form on a separate energy efficiency sticker, where the date can be written in full.
Labeling features of Atlant and Pozis refrigerators
Belarusian Atlant and Russian Pozis (Pozis Plant, Zelenodolsk) use their own standards, which are often more understandable for the local consumer, as they correspond to GOST or internal specifications.
U refrigerators Atlant The serial number is printed on a nameplate located on the right inside the camera or on the back wall. The date of manufacture is often indicated explicitly in the "Date" or "Date" column, but if it is not there, look at the serial number. On older models, the first two digits of the number could indicate the year, and the next two - the month. Modern models (after 2010) often use the format YYMM at the beginning or end of the line.
Pozis also adheres to a clear structure. The nameplate usually has a “Date of Issue” field, where numbers in the format MM.YY or DD.MM.YYare embossed in ink or with a printer. If there is no explicit date, look for 4 digits in the serial number (S/N) that logically add up to the date. For example, in the number 12345678 the combination 12 and 23 can mean December 2023.
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Table of correspondence between codes and years of manufacture
To simplify the task, we offer a summary table that will help you quickly navigate the designations for the most common brands. Remember that manufacturers can change encoding rules, so always double-check the information on the model.
Brand
Date location in S/N
Code format
Decoding example
Samsung
Start or end of line
YYMM (Year-Month)
2105... = May 2021
LG
First 2-4 digits
YYMM or YYWW
1912... = December 2019
Bosch/Siemens
First 4 digits
YYMM or YYWW
2035... = 35th week 2020
Indesit/Ariston
Numbers after 2 letters
GWW (Year + Week)
...412... = 12th week 2014/2026
Atlant
Separate field or beginning
MM.YY or YYMM
05.22 = May 2022
Use weekly format (WW) is a standard for European technology, as it allows you to accurately plan the production and logistics of components within short time frames segments.
Frequent errors when determining the age of equipment
When decoding independently, users often make mistakes that lead to incorrect conclusions about the age of the device. The most common of them is confusion between model year and the year of actual production.
The model may have been developed and presented in 2018, but the specific copy standing in your kitchen was assembled in 2021. The serial number indicates the production date, and not the release date of the model. This is important for the warranty: it is counted from the date of sale or the date of production (if the receipt is lost).
⚠️ Attention: If you buy a refrigerator that is listed as “new”, but more than 12 months have passed since the date of production, check with the seller for the reason. The warranty period may already be running, even if the device has not been turned on.
Another error is ignoring the month indicator letter. In some systems (for example, older Electrolux or Zanussi models), the year is indicated by a number, and the month by a letter of the English alphabet (A = January, B = February, and so on, sometimes omitting the letter I so as not to be confused with the unit).
Why is it important to know the exact date of manufacture
Knowing the exact age of your refrigerator is not just satisfying curiosity. It is a practical tool for maintenance and saving money. Firstly, this is a warranty issue. If the refrigerator breaks down 13 months after purchase, but you find out that it was manufactured 18 months ago, the manufacturer may refuse free repairs, arguing that the period has expired from the date of production.
Secondly, this is important when selecting spare parts. As already mentioned, the same model released in different years may have different compressors, thermostats or control boards. When ordering a part by model, you risk receiving an incompatible unit if you do not provide the service center with the exact serial number and date.
Thirdly, when selling equipment, knowing the exact age increases the buyer’s confidence. You can provide evidence that the refrigerator is not 10 years old, as it seems from its appearance, but only 3 years old, which justifies the higher price.
Can the serial number be fake?
Theoretically, yes, the stickers on counterfeit equipment can be re-glued. However, counterfeiting refrigerators is a complex process, and scammers often change the appearance rather than tinker with electronics and nameplates. If the number looks crookedly stuck on or the numbers are stamped on top of the old paint, this is a reason to be wary.
What to do if the sticker with the number is not readable?
If the sticker has worn off, try to find a duplicate in the technical passport or on the box. The number can also be stamped on a metal plate (if there is one) or duplicated in the menu of the smart refrigerator (section “About the device” on the display). In extreme cases, the date can be known at the service center based on the history of calls, if you have previously called a technician.
Does the production date affect the quality of the assembly?
There is an opinion that equipment assembled during certain periods (for example, during holidays or changes in suppliers) may have more defects. While this is statistically possible, modern quality control lines minimize such risks. The conditions of transportation and installation are much more important than the specific week of assembly.