How Repairability Scoring Actually Works

Repairability arrives in most companies as a compliance request and is handed to whoever owns documentation. That is the wrong department, because the score is largely determined by decisions made two years earlier by mechanical engineering.

EN 45554 provides the general method for assessing the ability to repair, reuse and upgrade energy-related products. Understanding what it actually measures makes clear why it cannot be improved retrospectively by writing a better manual.

What the standard measures

The assessment works on priority parts — the components that actually fail in service — rather than on the product as a whole. That focus matters: a product can be broadly modular and still score poorly if the one part that fails is the one buried deepest.

Three of those seven are commercial rather than technical. That is worth noticing, because it means a meaningful part of the score can be improved by decisions that cost nothing to implement and are frequently opposed for reasons unrelated to engineering.

Why disassembly depth dominates

Depth is counted as the number of steps needed to reach and remove a priority part. Each step is a fastener removed, a component displaced, an adhesive released. The count rises quickly in dense assemblies.

The economic consequence is direct. A repair requiring twenty minutes of skilled labour to reach the failed part is uneconomic against the price of a replacement product for most consumer goods. The score is not measuring inconvenience; it is measuring whether repair happens at all.

Fasteners are the cheapest lever

Fastener choice affects several criteria at once and is usually the least contested change, because the alternatives are comparable in cost and the decision is often made by default rather than deliberately.

• Reusable fasteners — screws that survive removal and reinstallation. The strongest position, and rarely more expensive.
• Removable fasteners — clips that release without damage. Acceptable, and dependent on the release being possible without a specialist tool.
• Non-reusable fasteners — rivets, or clips designed to break. These cap the score regardless of everything else.
• Permanent joins — adhesive and welds. These make a part non-separable in practice, which affects recyclability as well as repairability.

Adhesive is the recurring problem. It is chosen for assembly speed and thinness, and it converts a repairable product into a disposable one more decisively than any other single decision.

The commercial criteria

Spare part availability is a stated commitment: parts remain orderable for a defined number of years after the last unit is placed on the market, within a maximum delivery time. It is a supply chain and finance decision rather than an engineering one.

Spare part price is assessed as a ratio to the product price, which prevents the common evasion of technically offering a part at a price nobody would pay. A display assembly priced at eighty per cent of a new unit is not a repair option in any meaningful sense.

Repair information access is where policy most often contradicts engineering. A product designed to be serviced, whose service documentation is restricted to authorised partners, scores worse than the hardware deserves. Where a delegated act requires information to be available to independent repairers, restricting it becomes a compliance failure rather than a commercial choice.

How the score enters the passport

For product groups where a delegated act sets reparability requirements, the score and its underlying parameters become passport attributes. That has two consequences worth planning for.

The first is that the score becomes publicly comparable. A consumer or a procurement officer can compare two products directly, which converts repairability from a sustainability talking point into a purchasing criterion.

The second is that the supporting parameters have to be evidenced, not merely asserted. Spare part availability stated as ten years is a commitment somebody can check in year six, and the passport is where they will check it.

What to do with an existing product

For a product already in production the architecture is fixed, which leaves the commercial criteria. Those are worth pursuing precisely because they are the ones available.

Extending the spare part window, publishing a realistic parts price list, and releasing service documentation to independent repairers can each move a score without touching tooling. They also address the criteria most visible to the people comparing products.

For the next product, the useful intervention is much earlier: assess repairability at the architecture review rather than at the compliance review. By the time a compliance team is asked for a score, the answer has already been decided.