Step testing

What this usually means

If a socket, switch, light, spur or breaker is behaving oddly, the useful first step is usually to follow the fault in stages. What changed, what still works, what trips, and whether the problem is repeatable all help point the visit in the right direction.

What is usually checked first

• The symptom pattern: dead point, intermittent fault, repeated trip, or a problem that started after something was changed.
• The affected accessory, fitting or nearby point, plus the relevant protective device at the consumer unit.
• Whether the fault looks local to one point or more likely sits on the wider circuit.

What step testing can help rule in or out

• A failed accessory or fitting that can be repaired or replaced locally.
• A loose, damaged or heat-affected connection near the point of failure.
• A fault that only looks local but actually points to something wider.
• The difference between a straightforward small-job repair and a broader remedial plan.

What can change the scope

• Signs of heat, burning, repeated tripping, hidden joints or poor previous work can move the job beyond a simple local repair.
• If the fault is intermittent or only appears under certain use, the useful outcome may be a clearer diagnosis rather than an instant fix.
• If there is a burning smell, visible damage or a breaker that will not stay on, use emergency help rather than treating it as a standard guide enquiry.