Fuse box keeps tripping? Here’s how to find out why

A fuse box (consumer unit) that keeps tripping is your home’s electrics doing their job — cutting power to protect you from a fault. The trick is working out what’s causing it. Some causes you can identify safely yourself; others need a registered electrician. Here’s how to tell, and how to make sure any repair quote is fair.

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First, which switch is tripping?

Open your consumer unit and see what’s flipped off. An RCD (the bigger switch protecting a group of circuits) tripping usually points to a fault somewhere on that group — often a faulty appliance. A single MCB (smaller breaker) tripping points to one specific circuit.

Common causes

A faulty appliance — kettles, washing machines, and immersion heaters are common culprits. Often the easiest to find.
An overloaded circuit — too many high-power devices on one circuit.
Moisture getting into outdoor sockets, lights, or wiring.
A wiring fault — older or damaged wiring, which needs an electrician.

How to find the culprit safely

If an RCD trips, you can often narrow it down yourself: unplug everything on the affected circuits, reset the RCD, then plug appliances back in one at a time until it trips again — the last one you plugged in is the likely cause. If resetting the switch won’t hold at all, or it trips with nothing plugged in, stop and call an electrician.

Never remove the consumer unit cover or attempt wiring work yourself — that’s a job for a qualified electrician.

When to call a registered electrician

The breaker won’t reset, or trips again immediately.
It trips with all appliances unplugged — pointing to a wiring fault.
You can smell burning, see scorch marks, or sockets feel hot.
The consumer unit is old (e.g. an old fuse-wire board) and may need upgrading.

Electrical work should be done by someone registered with a scheme like NICEIC, NAPIT or ELECSA — especially anything notifiable under Part P of the Building Regulations. Ask for their registration details, and once you have a quote, check it’s fair before going ahead.

Frequently asked questions

Why does my fuse box keep tripping?

It is usually caused by a faulty appliance, an overloaded circuit, moisture, or a wiring fault. Working out which switch trips — an RCD or a single breaker — helps narrow it down. Persistent tripping with nothing plugged in points to a wiring fault that needs an electrician.

Is it safe to keep resetting a tripped fuse box?

Resetting once is fine, and if it holds, the cause may have been a one-off. But if it trips repeatedly, keeps refusing to reset, or you smell burning, stop resetting it and call a registered electrician — repeated tripping is a warning sign.

How much does an electrician cost to fix a tripping fuse box?

It depends on the cause, from a quick fault-find to replacing a consumer unit. Get a quote from a registered electrician and use our free quote checker to see whether it is in the normal range.

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