A Guide to The Most Common Electrical Problems

Introduction (symptoms you’ll recognise)

Buzzing switches, flickering downlights, tripping RCDs and beeping alarms are common in UK homes. Here’s how to interpret symptoms and what to do next.

What this involves (by fault type)

Tripping RCD/MCB: Unplug all appliances on the affected circuit, then reintroduce one at a time. If it still trips with everything unplugged, the wiring/accessory likely needs an electrician to test.
Dead socket/run of sockets: Check the consumer unit and any local fused connection units; replace damaged sockets and test ring continuity professionally if persistent.
Flickering or failed downlights: Replace lamps with correct type; consider upgrading to fire‑rated, quality LED fittings and check for overheated lampholders.
Beeping smoke/heat alarms: Replace batteries or the entire alarm if past end‑of‑life (often 7–10 years). Test monthly.
Outdoor circuits: Moisture ingress in fittings causes trips; use IP‑rated gear and weatherproof joints.

What can affect price

Fault‑finding complexity (intermittent vs consistent faults)
Height/access (lofts, high ceilings)
Upgrades to current regs (RCD protection, AFDDs in some specs)

Typical guides:

Minor repair (switch/socket/light): £60–£120 + parts
Circuit fault‑find and repair: £120–£250 depending on time/parts
Detector replacements (each): £50–£100 + device

How long it takes & safety tips

Minor fixes: 30–60 minutes
Fault‑finding: 60–180 minutes depending on complexity

Safety: Don’t open the consumer unit cover unless competent. Test RCDs quarterly using the test button. Use the correct lamp types and ratings.

DIY vs hire a pro

DIY is reasonable for lamp changes and replacing clearly compatible detectors on baseplates. Hire an electrician for tripping circuits, rewiring, consumer unit work, or anything in bathrooms/outdoors.

Next steps

Note symptoms (what/when) and gather photos of the consumer unit and affected accessories
Try safe, reversible steps (unplug appliances, change lamps)
Book a registered electrician (NICEIC/NAPIT) for persistent faults; request findings in writing