Electrical fault finding in Harlow
Diagnosis is its own job, priced separately from the repair, and for good reason: finding an intermittent fault is the unpredictable part. Here is what the common symptoms usually mean, and what you can rule out yourself in ten minutes.
Run these checks before you call
A large share of RCD call-outs turn out to be a single failing appliance, and you can find it without tools. Unplug everything on the affected circuit. Reset the RCD. If it holds, plug items back in one at a time, waiting a minute between each. The one that trips it is your culprit — usually something with a heating element: an immersion heater, a shower, an oven, a washing machine, or an outdoor extension lead that has taken in water.
What the common symptoms usually mean
| Symptom | Usual causes | Typical diagnosis time |
|---|---|---|
| RCD trips occasionally, resets fine | Failing appliance element; damp outdoor circuit; cumulative leakage | 1–2 hours |
| RCD trips instantly on reset | Fixed-wiring fault; damaged cable; water ingress | 2–3 hours |
| One socket dead, others fine | Loose connection at the accessory or a spur back-box | Under an hour |
| Half the sockets dead | Break in a ring final circuit — needs continuity testing | 2–3 hours |
| Lights dim or flicker under load | Loose neutral or a poor connection | 1–2 hours |
| Everything dead, meter dark | Not your wiring — call 105, free | n/a |
Why it is charged by the hour
A dead socket is usually a loose terminal and takes twenty minutes. An intermittent trip that only happens when the shower runs on a cold morning can take several visits to catch. An electrician quoting a flat fee for an unknown fault is either padding the easy case or will renegotiate on the hard one. Expect £100–£200 for the first hour, an hourly rate after that, and a separate quote for the repair once the cause is known.
If diagnosis turns up widespread deterioration rather than one fault, the sensible next step is usually an EICR rather than a run of individual repairs — it tests the whole installation and tells you what needs doing, in priority order.
Describe the fault and get quotes
The more specific you are — which circuit, when it trips, what is running at the time — the more accurate the quotes come back.
What we will not do: we do not sell your details on, we do not add you to a marketing list, and we do not require a phone number. If you would rather not be called, leave the phone out — email is enough.