A Fault-Finding Checklist for LED Lamps and Fixtures

Warranty claims and support emails both get cheaper when the first conversation follows a sequence rather than a guess. This is the sequence we use before agreeing that a unit has failed.

Work in this order

Each step eliminates a cause that would otherwise be tested later at greater cost:

1. Try the lamp in a different socket, on a different circuit, with another appliance on that circuit
2. Check the bulb, if the lamp takes one, against a known good bulb of the same base
3. Check the switch at every position and listen for a scraping or crackling sound
4. Inspect the cord and plug for strain, heat marks or a bent blade
5. Check the dimmer, if fitted, with the load reduced or increased

The five causes, ranked

In practice, reported LED lamp faults distribute roughly as follows, and the distribution is stable enough to be useful to a support team:

Flicker has its own logic

A lamp that flickers only when dimmed is a compatibility problem. A lamp that flickers at full output is a driver problem. A lamp that flickers when another appliance switches on is a wiring or circuit problem, and telling the customer that is a service rather than an excuse.

What to ask for in the first email

A photograph, the order number, whether the fault is constant or intermittent, and whether the lamp is dimmed. Those four items resolve a large share of tickets without a second exchange, and they make the remaining claims straightforward to process.

Fix the cause upstream

If a third of the volume of reported faults is a bulb the customer fitted themselves, the cheapest fix is packaging that states the requirement clearly and a bulb supplied in the carton. Neither change is a product improvement, and both reduce support cost.