Abstract
Product repairs are at the core of sustainable consumption and user manuals can play a relevant role in facilitating them. They are the accredited source of product information for end users and are therefore sought as an important means for the diagnosis and subsequent repair of household appliances. However, despite increasing societal demand for repairable products, few studies have been conducted on the extent to which manuals contribute to the fault diagnosis and subsequent repair process. In this study, we analysed current guidance provided by manuals for the diagnosis process, answering the research question: ‘To what extent do user manuals provide sufficient information to diagnose the most frequent faults in household appliances?’ We examined the diagnosis instructions provided in the user manuals of four different household appliances using data on the appliances’ most frequently failing components, and a framework that considers three steps towards a successful diagnosis: fault detection, fault location, and fault isolation. In total, we analysed 150 user manuals of 48 brands available on the European market. We show that manuals do not instruct the diagnosis of frequently failing components. They mainly refer to causes of failure and directly recommend corrective actions after fault detection. Thus, they rarely include a three-step fault diagnosis process to identify and isolate a faulty component. Based on these results, we have extended the framework for the process of fault diagnosis to include a step from cause identification to corrective action. Both routes, the component-oriented and the cause-oriented route in fault diagnosis, should be considered during the design of products for easy fault diagnosis, and should be included in future regulations that address product reparability.
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Introduction
Repairing products instead of replacing them when they fail is at the core of sustainable consumption and is considered a core recovery pathway in a circular economy [9]. Product repairs extend a product’s lifespan and consequently, delay its disposal. They slow the flow of products that enter the economic system, which is one the strategies towards a circular economy [2]). Repairs have a low environmental impact, and in the case of small household appliances, tend to be a better option than replacement. Extending the life of products requires little energy and few resources [7] and contributes to a reduction of energy associated with new productions [31]. Moreover, product repairs run on “manpower” and can be done locally. So they can have an added positive socioeconomic impact by creating jobs at home and boosting economic development [31]. Hence, the societal, economic, and environmental impact of repairs makes them not only a circular economy strategy, but also a sustainable choice [21].
The process of fault diagnosis is important to facilitate repairs in a circular economy. It is “the action to identify and characterise the fault” (IEC, 192–06-20, [12]). In other words, it reveals what needs to be repaired in a product. It is therefore a fundamental step before effectively starting the repair action. Facilitating the fault diagnosis process can ease the repair process by reducing the amount of time, number of errors, and complexity associated with the repair process [14, 19, 22]. When successfully completed, the process of fault diagnosis identifies the defective component, thereby helping to determine whether a repair is feasible and worthwhile. Knowing which component failed helps to estimate the required skills, labour time, costs of replacement parts, shipping time, and other associated repair costs. Moreover, a smooth fault diagnosis can promote sustainable behaviour: consumers feel more inclined to repair if any uncertainties associated with a product malfunction are reduced [5, 18, 29, 30]. Hence, facilitating the diagnosis process could help in reducing commonly described consumer barriers to repair such as inconvenience, lack of time, lack of skills, and associated financial costs to the repair [13, 16, 33].
Guidance during the diagnosis process procures a more effective outcome [14]. A recent study showed that, for end users, guidance is decisive in successfully diagnosing the faults in malfunctioning appliances [24]. These findings agree with recent requirements in Ecodesign regulations and reparability studies, which concur that the provision of diagnosis information is necessary to facilitate product repairs. Ecodesign regulations for washing machines in [34], and dishwashers in [36] now require that user manuals provide fault diagnosis information. For instance, they stipulate facilitating the identification of error signals in the appliances, their meaning, and subsequent actions to take. New upcoming Ecodesign regulations aimed to enforce the Circular Economy Action Plan [35] are expected to include similar requirements. Likewise, reparability analysts and researchers have indicated that manufacturers should provide diagnosis information to facilitate repairs [27, 32]. They concur that user manuals can better support the diagnosis process if they, at least, provide sufficient information to diagnose common faults [3, 8]. Moreover, product safety standards recommend that manufacturers provide diagnosis information in user manuals. [37] requires that products intended for consumers are accompanied by a user manual which includes information and advice relevant to the product’s lifetime. The standard for compliance with the Safety Regulation (EC/IEEE 82079–1:2019) [17] recommends that manuals include information to correct potential product failures. Hence, manuals should facilitate the diagnosis and correction of potential product failures to facilitate product repairs. However, up to now, far too little attention has been paid to analysing which common product faults are included in the manuals, and how their diagnosis and correction is facilitated.
Previous academic studies on the content of user manuals examine topics like the usability and accessibility of manuals [6], their effect on customer satisfaction [11], how the content should be developed for optimal product use [26], or how alternative media such as virtual and augmented reality can be used to present the manual’s information [10, 20]. Similarly, the literature on repair practices does not discuss the diagnosis step, even though it notes that the current content of user manuals is insufficient to facilitate repairs [4, 24, 29]. Therefore, it remains unclear how much support manuals provide to end users regarding the diagnosis of malfunctioning appliances. To date, no studies have examined this claim in detail.
In this study, we address the research question: “To what extent do user manuals provide sufficient information to diagnose the most frequent faults in household appliances?”. To this end, we analysed the troubleshooting sections of a broad and varied sample of user manuals of products commonly present in European households. We limited our analysis to widely available domestic appliances, due to the variety of design features and components they embody, and the availability of data on failure rate. ICT equipment is not within the scope of this study as these products are designed and used in a different way and subject to different regulations. For the analysis, we used a framework of the fault diagnosis process, applying the data on the appliances’ most frequently reported faults.
In the following section (the “Method” section), we describe the method we employed for the analysis. In the “Results” section, we report the results of our analysis. In the “Discussion” section, we discuss the results; and in the “Conclusions” section, we present our conclusions.
Method
We present the criteria for the selection of the appliances and user manuals, and the procedure followed to analyse the manuals’ troubleshooting sections.
Selection of the Manuals
We aimed to have a broad and varied sample of manuals from frequently used products in European households. Hence, we applied criteria that considered different European manufacturers and consumers (see Table 1).
To select the manuals, we first defined the appliance types, then the brand, and finally the appliance models. The appliance type selection started with criterion “a” (see Table 1), which narrowed down our selection of product categories to large and small household appliances. These were the most sold product categories in 2017 (Eurostat statistics, accessed February 2021). Using criterion “b”, we limited our selection to those appliances with failures that had been studied in scientific papers or reports. Using criterion “c”, we selected a variety of electromechanical appliances with representative functions, e.g. heating, cooling, suction, blowing, rotating, and circulating water. We further refined our selection using criterion “d”, which helped us choose cylinder vacuum cleaners over stick or upright, or single dose coffee machine in lieu of percolators.
To select the brands, we sourced brand names from different consumers and manufacturers’ associations and applied criterion “e”. Last, we selected different models within a brand using criteria “f”, “g”, and “h”. Our final selection of appliance type and brands can be found in Table 2. Details of the models can be found in the supplementary material.
Analysis of the User Manuals
To analyse the content of the manuals, we first developed criteria based on the framework of fault diagnosis by end users presented in Pozo Arcos et al. [25] (see Fig. 1). We selected this framework because it is the most accurate representation available of the diagnosis process by end users of a household appliance. It is based on a literature review and has been refined and validated with 24 participants during an observatory study (Ibid).
The framework illustrates three steps end users follow from product failure to the identification of the fault, i.e. the diagnosis of the appliance. The first step towards the diagnosis is to detect the fault in the malfunctioning appliance. The user observes symptoms of malfunction and uses those together with other product information to deduce possible causes of failure, i.e. fault location. Subsequently, the user will test or check the condition of the suspected components. This last step is called fault isolation. The study showed that users iterate between fault location and fault isolation until the fault is found.
A manual that facilitates the diagnosis process would be expected to guide the user through these consecutive steps. Hence, the manuals are expected to provide a clear description of the symptoms to facilitate the fault detection step. In the case of error signals, it would be helpful if the manuals described both: the malfunction as well as the error signal [25]. Following fault detection, the manuals are then expected to facilitate fault location by relating symptoms to related possibly defective components. In the case of symptoms in the form of error signals, their meaning and possible causes for their occurrence should also be described. After the potentially faulty components are located, the faults need to be isolated. Fault isolation is facilitated if the manuals explain how to check the condition of components, which implies knowledge of the healthy and the defective state of the component. In some instances, components may require (partial) disassembly of the appliance to inspect the components. In those cases, the manual should also explain the required disassembly steps.
We developed a criterion from each of the diagnosis steps. We restricted the analysis to the five most frequent faults in the appliances and added a criterion to consider possibly unexpected findings. A summary of the criteria for analysing the user manuals is presented in Table 3.
As a second step, we collected data on the five most frequently failing components for each of the four appliances, the related symptoms, and possible defects in the components. Data on frequently failing components were available in the literature [24, 32], and reports from consumer and repair associations like Test ankoop, Which?, and the Repair Cafe [3, 27]. Table 4 presents a description of the datasets and the top 5 frequently failing components for each of the appliances. Data on common defects and symptoms were gathered from online repair tutorials found on the video platform YouTube. We chose this source due to its wiki-based nature, which provides large amounts of information from different product experts and users. Moreover, we preferred to rely on an audio-visual medium to be able to quickly compare whether the appliances corresponded to those selected in our criteria. We searched for terms such as “troubleshooting [appliance type]” or “most common symptoms of [appliance type]”.
In a next step, we analysed the manuals quantitatively and qualitatively. We limited the analysis to one manual per brand and appliance type because we observed that within a brand, product models of similar technology and function had the same troubleshooting sections. For each of the frequently failing components, we analysed the manual’s troubleshooting sections by first checking whether the component was mentioned at all, and next, by mapping the extent to which the manual guided the user through the fault diagnosis process (from symptom to faulty component) in order to identify the defective component. We used the five criteria in Table 3 to structure our analysis. The framework’s steps were used as indexes for the content, as suggested by Ritchie and Lewis [28].
Results
In this section, we describe the guidance provided by user manuals on diagnosing the appliances’ top five common faults. At the end of the section, we provide a summary of our findings. The complete dataset of the analysis is provided as supplementary material.
Single-Dose Coffee Makers
We analysed 11 user manuals for single-dose coffee makers. The manuals rarely referred to faults in the most frequently failing components, and focused on limescale, a more generic potential cause of failure. Fault detection was facilitated but instructions for fault location and fault isolation were rarely provided. Instead, the manuals commonly advise users to perform maintenance tasks or restart the appliance to remove the cause of the failure (see Tables 5 and 6).
Cylinder Vacuum Cleaners
We analysed 13 cylinder vacuum cleaner user manuals. For frequently failing components, the manuals mostly focused on the filter and the hose, or referred to a cause like blockage in the airflow. Fault detection and fault location were often facilitated. Fault isolation was occasionally recommended. In most instances, the manuals advised performing a corrective action, often related to overdue maintenance (see Tables 7 and 8).
Washing Machines
We analysed 15 user manuals for front load washing machines. For the most frequently mentioned failing components, the manuals described internal errors in different electronic components. In most cases, these were sensor errors, and some referred to a blocked pump impeller. Fault detection and location were always facilitated. However, the manuals skipped fault isolation and instructed maintenance tasks or resetting the appliance depending on the component. In a few instances, the manuals directly referred the user to customer support after fault detection (see Tables 9 and 10).
Fridge–Freezers
We analysed 15 user manuals for free standing fridge-freezer units. The manuals rarely described the complete diagnosis of common faults. Fault detection was always facilitated while fault location was only mentioned for electronic components. Fault isolation instructions were never provided. Instead, the manuals usually advised performing maintenance tasks or resetting the appliance (see Tables 11 and 12).
Interestingly some refrigerators included a feature called smart-diagnostics by which the fridge could perform a self-diagnosis test and communicate the results to a smartphone app. The results of the test (audible sound signals) could only be interpreted by the app. Similar to the content of the manuals, the app either located the faults and directly recommended maintenance tasks or referred the user to customer support. The manuals did not include the meaning of the smart-diagnostics audible signals. Hence, we could not conclude for which faults this feature could be used.
Discussion
In this study, we aimed to analyse to what extent user manuals facilitate the diagnosis of the most frequent faults in four types of household appliances. The results show that manuals usually lack information to accurately diagnose frequent faults as reported by repair centres and consumer organisations. The manuals only facilitate the diagnosis and correction of faults caused by a lack of maintenance, or that are due to an internal state failure of electronic components. Other types of faults, for instance due to wear and tear, were hardly ever mentioned, although statistics show they are among the top five most frequent faults.
For those faults included in the manuals, fault detection was always facilitated: the manuals described symptoms related to the faults. The fault location step was facilitated in some cases. Generally, different descriptions of symptoms were related to a single, defective component. However, we also observed specific instances in which the manuals did not locate the fault, and instead referred to the most likely cause of failure in the appliance, e.g. limescale. Last, we observed that the fault isolation step was rarely facilitated. The manuals occasionally advised isolation actions, e.g. inspecting the sound of a pump or checking for blockages in components; but it was more common to find instructions for carrying out maintenance tasks, e.g. cleaning, descaling, unblocking, defrosting; or restarting the appliance. Therefore, we conclude that manuals do not provide support for users to diagnose frequent faults such as a broken pump or a defective magnet in a coffee maker, a motor failure in a vacuum cleaner, or a short circuit in electronic components. In such cases, the user receives no guidance, but is simply referred to customer support or a service centre.
An important finding is that the manuals provide a “shortcut” for the diagnosis of faults caused by lack of maintenance or internal state failure of electronics. After the initial step of fault detection, the detected symptom(s) are immediately related to a potential cause of failure, thus bypassing the process of fault location and fault isolation. Based on the anticipated cause, a corrective action is advised, like decalcification of the appliance or resetting the electronics. This fault diagnosis route (referred to as “cause-oriented”) seems especially effective if (1) the observed symptoms are known to be strongly related to a specific cause, or (2) the observed symptoms are difficult to relate to a specific component (e.g., in the case of scale deposition throughout the appliance), and (3) the subsequent corrective action is straightforward, easy, and inexpensive. We have expanded the framework of the diagnosis process to reflect this new finding (see Fig. 2).
The choice made by manufacturers to not give full disclosure on how to diagnose and repair frequently failing components, and instead to limit themselves to faults that occur due to a lack of maintenance, has both advantages and disadvantages. These are discussed from the perspectives of manufacturers and of end users (consumers).
From the perspective of manufacturers, limiting the diagnosis information to faults due to lack of maintenance and only facilitating the cause-oriented route makes the diagnosis and troubleshooting process relatively risk-free and safe for end users. By only allowing the most basic and straightforward corrective actions (like resetting an appliance, running an automatic descale program, or replacing filters), manufacturers avoid potential safety risks that could occur when a user dismantles an appliance in order to diagnose a fault and repair the product. In principle, it also allows manufacturers to acquire valuable data on frequent failures, as the customer support and service centres can log the complaints, returns, and repairs. This data can be valuable information for manufacturers and designers [15, 23]. Moreover, the current approach in user manuals may drive up sales and profits, as consumers who cannot diagnose and fix their appliances may be inclined to replace them instead of having them repaired, especially when the appliances are inexpensive. The inconvenience and complexity associated with a repair are well-identified barriers for repair practices [13]. At the same time, providing a limited amount of diagnosis information could cause dissatisfaction among a subset of consumers who want to be able to fully diagnose and repair their products. This may damage the brand’s image, as exemplified by iFixit’s campaign about low reparability scores of certain brands of smartphones. Moreover, Raihanian Mashhadi et al. [17] found that repair convenience can influence future repurchase decisions or recommendations to other product users of a certain product or brand. In addition, limiting the diagnosis information available in manuals could drive up costs for manufacturers. For instance, in the case of frequently failing components that are not mentioned in the manuals, manufacturers may have to deal with relatively high return rates and in-warranty repairs.
From the perspective of end users, the current approach in user manuals provides an easy, quick, and cheap correction and fault diagnosis process. In many instances, the advice given in the manuals will help consumers fix their appliance without having to open it up. Various manuals of coffee makers now support fault diagnosis due to limescale by simply pressing a button (see results coffee maker Tables 5 and 6). Other examples include error codes that have clear explanations in the manuals. This shows that a successful fault diagnosis does not always have to result in dismantling an appliance, preventing users from incurring safety risks. Another advantage of the current approach is that the manuals educate consumers about the need for maintenance. Having to decalcify a coffee maker in order to make it operational again teaches a consumer that regular decalcification will prevent this kind of troubleshooting in the future. It might lead to more attention for maintenance (although further research would need to establish whether this learning effect actually happens in practice). At the same time, the lack of provision of diagnosis information in manuals hampers a consumer’s ability to assess the costs of a repair. Not being able to diagnose a fault reliably means that consumers cannot make a cost estimate as to whether to repair or replace a product. This could lead to premature product replacement. Moreover, it may discourage the user from trying to repair the product. If users perceive that the process of fault diagnosis is difficult to perform, e.g. it requires skills, time, and effort, they may perceive it as being highly inconvenient and decide not to continue. In a recent study, Terzioğlu [33] found that the required knowledge, skills, and efforts to take on a product repair are some of the perceived technical barriers experienced by users. Furthermore, limiting diagnosis information in user manuals may lead to a further erosion of consumers’ “product literacy” [15]. Lack of information about the product and increased automation of the tasks can limit users’ ability to understand how a product works and how it should be maintained and repaired.
Overall, our findings indicate that both routes in the fault diagnosis process, the component-oriented and the cause-oriented route, are needed for the diagnosis of household appliances by end users and should, therefore, be considered during the design of products for easy fault diagnosis. The framework of the diagnosis process presented here (Fig. 2) can be useful to that end. Based on the results of this study and previous findings on the perceived difficulties during the diagnosis process by end users [25], we also recommend that fault diagnosis should be facilitated as much as possible without the need to open up or dismantle the appliance, for instance through feedback signals and other visual or auditory cues. One example of a coffee maker showed how a pump could be diagnosed following the component-oriented route without disassembly (see coffee maker results Tables 5 and 6). Moreover, the use of augmented reality and other digital support systems like smartphones is currently being explored in practice [1, 10, 20] and may open up interesting avenues to facilitate the diagnosis of household appliances. In addition, our study contributes with criteria to assess the guidance for the diagnosis of appliances provided in user manuals (Table 3). While current Ecodesign regulations and product safety standards recommend that user manuals should support the user in solving common faults (see the “Introduction” section, paragraph 3), the analysis of the manuals has revealed that the content is currently insufficient to inform the user on frequently occurring faults. Based on this evidence and in view of facilitating product repairs for end users, it is recommended that future sustainable product policy provides clearer directions as to which faults should be diagnosed. The criteria presented in this study (Table 3) could be a starting point, and a potential good addition to repair policy requirements such as product reparability scoring systems aimed at informing consumers on the ease of product repairs and incentivising design for repair.
Conclusions
In this study, we addressed to what extent user manuals facilitate the diagnosis of frequently failing components. We examined 150 manuals of 4 different household appliances with regard to their top 5 occurring faults, and three steps towards the diagnosis of an appliance: fault detection, fault location, and fault isolation. The manuals insufficiently facilitate the diagnosis of common faults; most only address overdue maintenance and faults related to the internal state of electronics. Hardware failure due to other causes is rarely addressed.
Our research has led to an expansion of the framework of the fault diagnosis process by end users. In addition to the component-oriented sequence of fault detection, fault location, and fault isolation, all aimed at pinpointing a specific faulty component; we observed a cause-oriented route when a symptom (i.e. fault detection) could be directly related to a probable cause. This cause-oriented alternative is especially clear for those faults due to overdue maintenance and internal error states of electronics. This alternative provides users with a rapid, safe, and cheap way to solve a potential cause failure and successfully conclude the diagnosis process, especially if the cause is removed.
Our complete depiction of the diagnosis process contributes to design practice, helping designers to consider both alternatives when facilitating the diagnosis process in products and in user manuals. Moreover, we present an example on how the inspection of components can be guided and facilitated without requiring disassembly, thus, with minimal risk for users. Similar approaches could be used for the diagnosis of components if the cause-oriented approach does not resolve the issue. Our study also provides an original contribution to literature on design for repair and user repair practices. The findings of the study show the support for diagnosis currently provided by manufacturers in user manuals. Hence, it contributes to a better understanding of the fault diagnosis process by end users, and expands our understanding on the end user’s perspective upon a product failure. Furthermore, the criteria used in this study can be used in future analyses and included in product reparability policy and requirements. This would assure that the most commonly occurring faults in appliances could be diagnosed by end users.
Future studies should investigate other types of consumer products to further validate the framework of the diagnosis process. Fault diagnosis might be different for other widely adopted consumer products such as fully electronic consumer products. Future research might also explore the implications of the cause-oriented approach to existing design guidelines for diagnosis, and whether successfully diagnosing the appliances by either route would translate into better product care. Furthermore, examining the impact of facilitating different levels of diagnosis information on a real-life repair-or-replace decision process would help designers, policy makers, and manufacturers better understand to what extent diagnosis information impacts a sustainable behaviour in comparison with other factors.
Data Availability
Supplementary material has been provided.
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Funding
This work was funded by the European Commission under the Horizon 2020 Marie Skłodowska Curie Action 2016 (Grant Agreement number 721909).
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Pozo Arcos, B., Bakker, C. & Balkenende, R. How User Manuals Support the Diagnosis of Common Faults in Household Appliances: an Analysis of 150 Manuals. Circ.Econ.Sust. 3, 535–555 (2023). https://doi.org/10.1007/s43615-022-00195-5
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DOI: https://doi.org/10.1007/s43615-022-00195-5