Spare parts: a design decision, not an after-sales task

After-sales · 2026-07-14

A replacement-part list defined during design costs almost nothing. The same list assembled from field failures costs more and covers less.

Where the parts list usually gets written

After the first warranty claim, in practice. A distributor reports that cord sets are failing, someone asks the factory for replacement parts, and the factory quotes what happens to be on the shelf.

That list is a record of what failed rather than a plan of what will fail. It misses the parts that fail rarely but block the product entirely, and it misses the parts that differ by voltage build or by production revision — which is how a distributor ends up holding stock that does not fit.

What changes when it is designed in

A parts list built during design carries the variant structure with it: which parts are shared across the platform, which differ by model, and which differ only by destination market. That last distinction is the one distributors get wrong most often, because cord sets and plugs are market-specific while baskets and seals are platform-wide.

Designing the list in also changes the commercial conversation. Accessory attach-rate becomes a planned objective rather than a side effect, and after-sales cost becomes something that can be quoted instead of absorbed.

The practical minimum

If a full list is not yet feasible, the minimum viable version is short: for each model in the range, the cord set, the plug, the basket, the grate, the seal and the control board, with the variant each one covers. That is one page, and it is the difference between a distributor who can service the product and one who cannot.

Where this sits in more detail

The reference pages behind this note, and the models it applies to.

Models this note applies to

Accessories & Spare Parts

Retention category. Attach rate is the commercial argument.

Air Fryers

Core adjacent category. Four architectures, and the strongest attach rate for accessories.

More notes

• Why a platform structure lowers the cost of your second SKU2026-10-02Multi-model programmes are usually justified by volume discount. The stronger argument is that models sharing a platform share tooling, fixtures, test jigs and inspection points.
• Decide the destination market before the specification is frozen2026-09-18Six things change as soon as the destination country is fixed — voltage, plug, test scope, marks, labelling and importer identity. Most of them are expensive to change afterwards.
• Usable capacity versus total capacity: the cheapest return-rate fix available2026-08-27The most-cited reason for returns in the air fryer category is a specification wording problem rather than a product problem.
• Exhibition report: what buyers asked that the catalogue did not answer2026-06-30Two days of conversations produced a list of questions that a product catalogue structurally cannot answer — and the pattern behind them.
• Lead time is a design decision more than a factory fact2026-05-21The number of distinct platforms in a range moves delivery time more than the number of machines on the floor does.