5 Typical Quality Defects in Commercial Coffee Maker and Inspection Checklist (Updated)

Commercial Coffee Maker Introduction

Many people wait till they’ve had their first hot coffee to start their workday. Consequently, coffee machines with more outstanding functions have been created in recent years. People appreciate how convenient these coffee makers are. Besides, additional programmability, such as automatic settings, allows you to change the brewing intensity and coffee powder thickness.

Defects in the coffee machine will bring us a lot of troubles, which may endanger our life. The coffee machine’s owner should learn about the coffee machine’s defects to choose a quality coffee machine. At the same time, coffee machine manufacturers and importers must also inspect coffee machines from time to time. It ensures that the best commercial coffee maker is delivered to the customer’s doorstep.

In this article, you will find out the defects of coffee machines. Besides, we will explain the inspections carried out to ensure the quality of the best commercial coffee maker. After reading this article, you can detect coffee machine defects. Shippers and manufacturers of coffee machines can also get information on inspections of coffee machines. Let’s get started!

Types of Coffee Machines

Before we discover the coffee machine’s defects, we will explore the various types of coffee machines. The coffee machine can be separated into three big groups, which are:

1. Manual Coffee Machine

A manual coffee machine is operated by pushing and pulling a level. Some coffee machines can be categorized in this group, which are:

  • French Press Coffee Makers
  • AeroPress
  • Cold Brew Coffee Makers
  • Vietnamese Coffee Makers

2. Electric Coffee Machine

The electric coffee machine functions using electricity to brew hot coffee automatically. The coffee makers found in this group are:

  • Drip Coffee Makers
  • Thermal Coffee Makers
  • Espresso machines
  • Percolators
  • Siphon Coffee Makers

3. Stovetop Coffee Machine

You can use this type of coffee machine on a stovetop only. It is preferable for campers who like to brew coffee over the fire or on the camping stove. One of the examples is:

  • Moka Pot Coffee Makers

Typical Coffee Machine Quality Defects

Coffee machines are susceptible to failure, just like any other item. It is an annoying issue when it happens. Let’s look at some commonly found defects in the coffee machine:

1. Sharp Points or Edges on the Surface

Sharp points or edges may harm us. Coffee machines with sharp points can cut our hands when brewing coffee.

2. Inadequate Mechanical Assembly

The bad mechanical assembly caused the coffee machine to malfunction. Some examples of bad mechanical assembly include poor design and faulty wiring.

3. LEDs Not Visible

LEDs that are not visible may be caused by faulty wiring. It can be quite troublesome as we cannot view the screen of specific coffee machines.

4. Unable to Ground The Coffee Bean

It may happen because the coffee grinder is clogged with coffee grounds, which is not a huge problem. But, it could be quality defects if the issue is not caused by is not clogged grinders.

5. Over Low Coffee Temperature

The heating elements might be broken or worn out in this case. If you just bought the coffee machine and this happens, it is because of the defects of the coffee machine.

How to Make a Inspection Checklist for Coffee Maker

To avoid the coffee machine’s defects, manufacturers or importers must inspect the coffee machine from time. The purpose is to provide the best commercial coffee maker to the end user. Here are the types of inspections that usually need to be taken before the coffee machine is shipped out.

1. Packaging & Packing Inspection

Inspectors will verify whether the packaging and packages meet the client’s requirements.

2. Structure & Materials Inspection

Including materials, structure, components, accessories, labels, printings, packaging, logo/markings, etc., compared to a golden sample.

3. Workmanship

Inspector will choose samples at random, record the flaws, and draw a conclusion based on the AQL Table.

4. On-site Test

Inspectors will check the function, accessories, dependability, etc., by performing the standard tests listed below.

Common On-Site Tests of Coffee Machines

on-site-tests-for-coffee-maker-inspectionThe on-site test is usually done before the shipment of coffee machines. It is the quality control service offered by professional inspection companies. The aim is to obtain the best commercial coffee maker with top quality. Below are examples of on-site tests carried out by the inspector.

1. Assembly Check

In this test, the inspector will build the unit with the instructions. It includes a user guide, instruction sheet, or any packaging required.

2. Function Check

Inspector will inspect some functions of the coffee machine. The best commercial coffee maker will pass all the tests below:

  • Test for the power ON/OFF operation.
  • Function test for the LED indicator light
  • The display must be configured using the hour and minute buttons.
  • The program button must function as required.
  • Specifications need to be stated in the packaging box and instruction book.

3. Fatigue Test

A fatigue test can assess a material’s resistance to cyclic fatigue loading. In the coffee machine fatigue test, each button, plug, and switch are pressed 20 times.

4. Rub Check

Inspector will dip cotton in water, wipe the rating label marking with his hand for 15 seconds, and then silkscreen print or electroplate it for 15 seconds.

5. Tape Check

The inspector will completely cover the printing or electroplating with 3M (600) gummed tape before peeling it off at 90°±30°.

6. Stability Test

The inspector will place the product in the least advantageous position possible, at a 15-degree incline. It ensures that it won’t cause a plate to slip when used normally.

7. Running Test

The inspector will operate the coffee machines continuously for at least 4 hours at +/- 10% of the rated voltage or time reference to the user instruction if less than 4 hours

Commercial Coffee Maker Running Test

8. Carton Drop Test

The inspector will drop the coffee machine carton at one corner, three edges, and six corners. The best commercial coffee maker will not break if it is dropped from a certain height. The height dropped depends on the weight of the carton itself, which is listed below:

One corner, three edges, six sides, at the height of

  • 30inch (﹤9.5kg)
  • 24inch (9.5kg~18.6kg)
  • 18inch (18.6kg~27.7kg)
  • 12inch (27.7kg~45.3kg)
  • 8inch (45.3kg~68kg) on the cement floor.

9. Hi-Pot Test

High voltage is applied to the assets during the test to check the electrical insulation’s suitability. The voltage applied to the coffee machine is 3500V for class II and 1500V for class I.

Coffee Maker Hi-Pot Test

10. Earth Continuity Check

Earth continuity checks ensure that any earthed metal components and the mains plug are connected securely. For a coffee machine, it is 25A for one second, ≤ 0.1ohm.

11. Input Power Check:

For heating appliances, there are proper inspect of input power which is as listed below

  • within +5% and -10% of﹥200W,
  • within ±10% of 25W~200W,
  • within +20% of ≤25W;

12. Application Test

The inspector will use coffee beans in this test to carry out function checks. It is to ensure the quality and make the best commercial coffee maker.

Coffee Maker Application Test

13. Internal check :

The unit will be opened by the inspector, who will visually inspect it for craftsmanship and component damage. The inspectors will also verify the components’ CDF(Construction Data Form) compliance, among other things.

Coffee Maker Internal check

Standards and Procedures of Coffee Machine Inspection

The inspection company will consider some standards and procedures when establishing coffee machine inspection methods. The coffee machine that passed the criteria is regarded as the best commercial coffee maker. The examples of standards and procedures for the coffee machine are listed below:

1. Coffee Machine Safety Standards

There are a few examples of coffee machine safety standards which are listed below:

  • UL 197 Commercial Electric Coffee Machine Standard
  • UL 1082 Household Electric Coffee Machine Standard
  • UL 60730-2-9 Temperature Sensing Control Standard
  • IEC 60335-2-15 Household Electric Coffee Machine Standard

2. Coffee Machine Food Protection and Sanitation Standards

  • Household Electric Coffee Maker Food Protection and Sanitation Standard, NSF/ANSI 4-2009

3. Coffee Machine Performance Standards

  • IEC 60661 standard – The performance of the various coffee machine manufacturers and types is assessed using this standard. Some tests in this standard are intended to determine the tested coffee machine’s coffee output time, coffee temperature, and quality.
  • ANSI/AHAM CM-1-2007 standard – This standard is developed by the Association for Home Appliance Manufacturers and the American National Standards Institute. It provides a framework for comparing and assessing the performance of various household coffee machine brands and types.


Many defects can be found in coffee machines. Manufacturers of coffee machines must ensure the coffee maker’s quality to produce the best commercial coffee maker. Importers should also take care of the packaging to ensure customer satisfaction. Hence, manufacturers and importers should carry out coffee machine inspections. The best commercial coffee maker with excellent quality will undoubtedly improve the brand image and sales.

I hope this article gives you essential knowledge on defects and quality control inspection, and which is best commercial coffee maker to buy. anyway, do not hesitate to contact us for more information about quality control inspection!


Author: AQI Service as a professional quality control service company in China specialized in providing a complete range of quality inspection and testing and certification services in China & Asia for global importers, buyers, retailers, and sellers.

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