Serial number and warranty tracking for equipment dealers

The question every equipment dealer gets

A customer walks in with a machine that has stopped working. Before anyone looks at it, the counter needs three answers: did we sell this unit, when, and is it still under warranty? If stock is tracked only by quantity, those answers depend on someone finding the old invoice, if it shows a serial number at all, and on the customer remembering the purchase date.

Serial-number tracking turns that into a lookup. Each physical unit has a record that follows it from the supplier's delivery to the customer and back again.

Serial numbers and batches answer different questions

Batch or lot tracking groups identical items made together: a batch of medicine, a lot of paint. It answers "which customers received items from batch X?" and "when does this batch expire?"

Serial tracking identifies one unit: one generator, one laptop, one compressor. It answers "where is unit 4471-B now, who bought it and is it under warranty?" Machines and equipment usually need serials and rarely need batches. Treat them as separate settings per product, and switch serials on only where a unit-level record is worth the extra scanning.

Capture the serial when goods arrive

The most reliable time to record a serial number is at receiving, while the box is in front of you. Good practice:

• record one serial per unit received, including free or replacement units the supplier included;
• scan rather than type wherever possible, and allow a list to be pasted when the supplier sends serials electronically;
• record the manufacture date if the product carries one, since some warranties and recalls depend on it;
• refuse a serial that is already in your stock, so a scanning mistake is caught at the door.

If goods are billed before they arrive, keep the serials on the purchase line until the goods are physically received. A draft bill is not proof that a unit exists.

Sell the exact unit, and start its warranty

At the point of sale, the salesperson scans or chooses the serial being handed over. A final invoice should carry exactly one serial for each unit sold. The system should refuse a serial that has already been sold, is at another branch, is in transit or has been written off, and say where that unit is.

The sale date then starts the warranty clock. With a warranty period defined on the product, the warranty end date is simply the sale date plus that period. Print the serial and the warranty end date on the invoice line, so the customer's copy carries the same facts as your records.

If an invoice is cancelled or edited, its serials must go back to available stock, or be swapped for the new ones, automatically. Otherwise the record drifts from reality within weeks.

Transfers and returns

When stock moves between branches, the serials move too. While goods are on the road, a unit belongs to no branch; it is in transit until the receiving branch confirms it. Only units actually available at the sending branch should be transferable.

When a customer returns a unit, record which serials came back and in what condition:

• a unit that can be resold goes back into available stock at the branch that received it;
• a faulty or damaged unit is marked as damaged, so nobody sells it by mistake.

Keep the history of the earlier sale on the unit's record. If the unit is sold again later, its new sale and warranty replace the old ones, and the history explains why it was in stock twice.

Existing stock without serial records

Few dealers start with perfect records. When you switch serial tracking on, there will be units on the shelf whose serials were never captured. A sensible rule is to accept a typed serial for such a unit only if the branch still holds stock that no recorded serial accounts for, and to record that the serial was added at the point of sale. That keeps selling possible without letting staff invent units the branch does not have.

Warranty claims and service

Serial tracking pays for itself at the service desk. A single search by serial should show:

• the product, its status and branch;
• the purchase bill it arrived on and the invoice it left on;
• the customer and the warranty end date, clearly marked as under warranty or expired;
• earlier warranty claims and service jobs for the same unit.

A warranty claim form that fills in the customer, product, purchase date and warranty expiry from the serial removes the most common source of disputes: the purchase date the customer remembers.

How NAQIX tracks serial numbers

In NAQIX, a product opts in with Track serial numbers and an optional warranty period in months; products without it behave as before, and serial tracking is independent of batch tracking.

• Purchases: each serial-tracked line takes one serial per unit received, typed, scanned or pasted, with an optional manufacture date.
• Sales and the till: scan, type or choose serials from the branch's stock; a final invoice needs one serial per unit. Cancelling or editing an invoice releases or swaps its serials.
• Warranty: the warranty end date is the sale date plus the product's warranty months, on the company's calendar. The serial, manufacture date and warranty end print on the invoice line.
• Transfers and customer returns: serials move in transit between branches, and returned units go back to stock or are marked damaged.
• Lookup: a serial search shows the purchase bill, sale invoice, customer, warranty status, warranty claims and service jobs, and whether the unit was sold on an instalment plan.

The warranty claim form fills in the customer, product, purchase date and warranty expiry when you type a serial sold by your business. See the Inventory and Service & maintenance pages for the wider workflows.

Rolling it out

Start with your highest-value machines, where a lost warranty dispute costs the most. Count and record serials for the units already on the shelf, train the receiving team first, and only then switch on serials at the counter. Within one season, the service desk will notice the difference.