Power Cuts in Your Home: What to Check Before Calling an Electrician

Home Power Cut Troubleshooting: Start Here

A sudden loss of power is one of those problems that immediately feels worse than it might actually be. Before you assume the worst — or call an electrician out of hours — there are several straightforward checks worth working through yourself. Good home power cut troubleshooting takes about ten minutes and can save you the cost of a call-out.

That said, some electrical faults are not safe to investigate yourself. This guide is clear about where the line is.

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Step 1: Check Whether the Outage Is Yours or the Network's

The very first thing to do is work out whether the problem is inside your property or on the National Grid supply.

Check your neighbours. If the street or a section of it is dark, the fault is almost certainly with your Distribution Network Operator (DNO) — in Kent, Surrey, and most of the South East, that's UK Power Networks. You can check live outages on their website or call 105, the free national power outage line.

If your neighbours have power and you don't, the fault is somewhere between the meter and your circuits. That's when home power cut troubleshooting really begins.

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Step 2: Locate Your Consumer Unit and Inspect the Switches

Your consumer unit — commonly called a fuse board or breaker box — is the first place to look. It's usually found in a hallway, under the stairs, in a kitchen cupboard, or in a utility room.

What you're looking for

Modern consumer units (installed or replaced since 2016) should conform to BS 7671:2018 and will contain:

• A main switch — isolates the entire installation
• Circuit breakers (MCBs) — one per circuit (lighting, sockets, cooker, etc.)
• Residual Current Devices (RCDs) — protect against electric shock and earth faults
• RCBO combinations — these combine both functions in a single device

If you've lost power to the whole house, check whether the main switch has tripped to the off position. This can happen after a significant fault or surge. Switch it back on firmly — it should click into place.

If only part of the house has lost power (a single room, just the upstairs sockets, just the lighting), look for an MCB that's moved to the off position, or an RCD switch that's dropped to the mid or down position.

Resetting a tripped breaker

Switch the MCB or RCD back to the on position. If it trips again immediately, something on that circuit is causing the fault and you should not keep resetting it.

If it holds, the trip was likely caused by a temporary overload — too many high-draw appliances running simultaneously, for example. This is common in homes in Maidstone, Rochester and across Kent where older properties have been rewired in sections and the load capacity hasn't been fully reviewed.

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Step 3: Identify What Was Running When the Power Cut Happened

Think back to what was switched on or plugged in immediately before the outage. A faulty appliance is one of the most common causes of a tripped RCD.

How to test this:

1. Unplug everything on the affected circuit
2. Reset the RCD or MCB
3. Plug appliances back in one at a time
4. When the breaker trips again, you've found the culprit

Remove that appliance from use. A continuously tripping RCD is a sign something is drawing current to earth — either through a damaged cable, a failed heating element, or internal component breakdown. The appliance should be PAT tested or replaced before use.

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Step 4: Check Your Meter and Incoming Supply

If the consumer unit looks fine — all switches in the on position — the problem may be upstream of it.

Look at your electricity meter. Most modern smart meters have a small display. If it's completely blank and unresponsive, there may be a fault with the meter itself or the incoming supply fuse. The supply fuse (the large fuse before your meter) is sealed and can only be replaced by your DNO or an approved contractor — you cannot and should not touch it.

Contact UK Power Networks on 0800 028 8247 if you suspect a supply or meter fault.

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Step 5: Check RCD Test Buttons and Older Fuse Boards

If your property has an older fuse board with rewirable fuses rather than MCBs, home power cut troubleshooting is more involved. You'll need to identify which fuse has blown by visually inspecting the fuse wire or using a continuity tester. Replacing fuse wire is technically a homeowner task, but if you're not confident doing it, call a qualified electrician.

Properties with older boards — particularly those in parts of Kent and Surrey with Victorian or Edwardian housing stock — often have installations that no longer meet current standards under BS 7671. A blown fuse is sometimes the first visible sign of a wider issue.

All consumer units installed in domestic properties since 2016 must include RCD protection under Part P of the Building Regulations. If yours doesn't, it's worth discussing an upgrade.

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When to Call a Qualified Electrician

There's a clear point at which you stop troubleshooting and pick up the phone. Call a NICEIC-approved electrician if:

• A circuit breaker or RCD trips again after resetting
• You can smell burning, see scorch marks, or notice a burning plastic smell near the consumer unit or sockets
• The main switch has tripped and won't reset
• You have no power but the meter appears to be live
• Your fuse board is old, has no RCD protection, or has signs of damage or corrosion
• You've lost power following water ingress or a flood
• The fault is intermittent and you can't identify the cause

Do not attempt to open the consumer unit enclosure, investigate the meter tails (the large cables between the meter and consumer unit), or tamper with anything sealed by the DNO. These are live conductors and not subject to the Part P permitted work rules — they require a qualified and authorised operative.

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What a Callout Typically Costs

For context, a domestic electrician call-out in the South East — covering areas like Bromley, Sidcup, Rochester, and into Surrey — typically ranges from £60 to £120 for the first hour, with additional time charged at £40–£80 per hour depending on complexity and contractor. Out-of-hours rates are higher.

If the fault is simple (a tripped RCD caused by an identifiable appliance), a call-out may only take 30–45 minutes. If it requires fault-finding across multiple circuits or partial rewiring, expect costs to rise accordingly. Any notifiable work — including consumer unit replacements — must be certified under Part P and registered with Building Control, either by the contractor (if registered with a competent person scheme like NICEIC) or through a separate application.

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A Quick Summary

Good home power cut troubleshooting follows a logical sequence: rule out a network fault, check the consumer unit, identify the faulty circuit, isolate the cause, and reset. Most partial outages have a straightforward explanation. Full outages with no obvious cause at the consumer unit need professional attention.

If you're based in Kent, Greater London, Surrey, or anywhere across the South East and you've worked through these steps without resolution, Cleary Electrical can help. We're a NICEIC-approved contractor based in Rochester, and we offer free quotes on all domestic electrical work. Get in touch via our contact page.