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When purchasing a smartphone, laptop, or washing machine, we almost always find a warranty label, such as one year, two years, or even ten years for certain components like refrigerator or air conditioning compressors. Have you ever wondered why companies are willing to repair or even replace products for free if they break down during the warranty period?
Wouldn’t that cost the company money?
The answer is far more interesting than simply “attracting customers.” Behind a warranty card lies a lengthy engineering process, from product design and testing to data analysis and risk calculation. In other words, a warranty isn’t a guess, but a decision based on science and data [1].
The Warranty Has Been Considered Since the Product Was Designed
Before a product is marketed, engineers consider not only how the product will work, but also how long it is expected to continue functioning properly. The field of science that studies this is called Reliability Engineering, a discipline that aims to estimate the probability that a product will perform its function without failure over a specified period of time [1].
For example, when a company designs a washing machine, they don’t immediately specify a one or two-year warranty period. They first analyze which components are most at risk of failure, customer usage patterns, and the environmental conditions in which the product will be used.
Products Are Not Sold Immediately, But Tested First
Before reaching consumers, a product typically undergoes various product tests. The goal is to ensure the product continues to perform under various conditions, such as high temperatures, humidity, vibration, or repeated use [2].
However, companies certainly can’t wait ten years just to find out if a refrigerator can last that long. That’s why Accelerated Life Testing is used, a test that accelerates the product’s aging process by subjecting it to more demanding working conditions than normal use. From these test results, engineers can estimate the component’s lifespan and the likelihood of failure within a certain timeframe [3].
Data Determines How Long a Warranty Should Be Given
Determining the warranty period isn’t simply a gut decision. Companies utilize test data, component failure data, and statistical analysis to estimate how many products are likely to fail during the warranty period [4]. As a simple example, if the analysis shows that most products still function properly after two years of normal use, the company will be more confident in offering a warranty for that period. Conversely, if a component has a higher risk of failure, the warranty period may be shortened or the company may refine the product’s design first.
Why Would Companies Repair Products for Free?
This is the part that often raises many questions. When a company repairs or replaces a product for free during the warranty period, it doesn’t mean they’re free of costs. These costs are actually estimated from the start as part of business planning and risk management [5].
Based on product reliability data, companies can estimate the number of warranty claims likely to occur. Estimated costs for repairs, component replacements, and after-sales service are then factored into the overall product cost calculation. This way, companies can continue to provide service to customers without disrupting business continuity.
This approach is also supported by Quality Assurance, which ensures the production process produces reliable products from the start, and Quality Control, which checks quality throughout the production process to prevent defective products from reaching consumers [6]. If problems persist after the product is in use, the company will use warranty claim data as input for continuous improvement, a process of continuous improvement to improve the design and production process for the next product generation [2].
Fun Fact 💡
Did you know? Not all components in a product have the same warranty period. In some brands of air conditioners or refrigerators, for example, the compressor may have a longer warranty than other components. This is because each component has different characteristics, usage patterns, and levels of reliability. Furthermore, damage due to manufacturing defects is usually covered by the warranty, while damage due to impact, liquid exposure, or improper use is generally not covered by the warranty [1].
A Warranty Is a Reflection of Product Confidence
When a company provides a warranty, they are demonstrating a level of confidence in the product they have designed and tested. This trust doesn’t just arise; it’s built through a process of engineering, testing, data analysis, quality control, and risk assessment that takes place long before the product is sold.
So, the next time you see a warranty card inside a smartphone or electronic device box, remember that behind that card lies a combination of manufacturing science, reliability engineering, and business strategy. The better a company understands the reliability of its product, the more confident they will be in providing a warranty to its customers.
Writer: Andika Putra Pamungkas
Editor: Brian Arga Prasidio Putra
Reference
[1] Elsayed A. Elsayed. *Reliability Engineering*. 3rd Edition. Wiley. 2021.
[2] Patrick D. T. O’Connor & Andre Kleyner. *Practical Reliability Engineering*. 5th Edition. Wiley. 2012.
[3] National Institute of Standards and Technology (NIST). *Accelerated Testing Methods*. https://www.nist.gov/
[4] IEEE Reliability Society. *Reliability Engineering Resources*. https://rs.ieee.org/
[5] Kececioglu, Dimitri B. *Reliability Engineering Handbook*. DEStech Publications. 2002.
[6] ASQ (American Society for Quality). *Quality Assurance and Quality Control*. https://asq.org/
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