RCD or Circuit Breaker Keeps Tripping

If your RCD or circuit breaker keeps tripping, it usually indicates an electrical fault designed to prevent danger. This guide explains the most common causes, safe checks you can carry out, and when the issue should be handled by a qualified electrician.

If you’re unsure where the fault is, using a simple Socket tester can quickly help identify whether the issue is with the socket, appliance, or wiring.

Common Reasons an RCD Keeps Tripping

An RCD trips when it detects an imbalance between live and neutral current, which usually means electricity is leaking to earth. This is a safety feature designed to prevent electric shock or fire.

Common causes include faulty appliances, damaged cables, moisture entering sockets or outdoor equipment, wiring faults, or an overloaded circuit.

Faulty appliance plugged into the circuit
Water ingress in outdoor sockets or garden equipment
Damaged flex or extension lead
Fault within a socket, light fitting, or junction box
Wiring fault on the circuit
Neutral-to-earth fault

Safe Checks You Can Carry Out

Some basic checks can help identify whether the issue is appliance-related. These checks should only be carried out if you feel confident and safe to do so.

Unplug all appliances on the affected circuit
Reset the RCD or circuit breaker
Plug appliances back in one at a time
Check for visible damage to plugs and cables
Avoid using outdoor equipment if the weather is wet
Use a Socket tester to quickly confirm whether the socket is wired correctly — this can immediately rule out common faults without needing to remove the socket.

If you’re comfortable carrying out basic checks, using a simple tester can help quickly identify whether the fault is with the socket, appliance, or wiring.

Before calling an electrician, many common electrical faults can be quickly identified using a few simple tools at home. These are the same types of testers electricians use to diagnose problems safely.

Recommended Tools

If you’re confident carrying out basic checks, these tools can help identify electrical faults safely:

Socket tester – quickly shows if the socket is wired correctly and safe to use
Multimeter – helps check voltage, continuity, and identify faults
Voltage tester pen – detects live wires instantly without contact
Energy monitor plug – helps identify if an appliance is using too much power or behaving abnormally, which can cause tripping issues

For a full list of tools you can use, see our guide on best electrical tools for homeowners.

Using these tools can help you identify the problem in minutes and avoid unnecessary call-out costs.

Many homeowners use a simple socket tester first before deciding whether an electrician is needed.

These tools are widely available online and can be useful for basic fault finding in the home.

When to Call an Electrician

If the RCD continues to trip with all appliances unplugged, or trips immediately when reset, this usually indicates a fixed wiring fault. These issues should only be investigated by a qualified electrician.

RCD trips instantly with no load connected
Burning smells or heat from sockets or consumer unit
Tripping occurs randomly or overnight
You are unsure which circuit is affected

Need an Electrician?

If this issue keeps happening or you’re unsure what’s causing it, a qualified electrician can safely diagnose and fix the problem. Electrical faults can worsen over time, so it’s best to get professional advice rather than risk damage or injury.

UK Electrical Safety Advice

Electrical faults can be dangerous. If you are unsure, always seek advice from a qualified electrician. This guidance is for general information only and does not replace a professional inspection.
For general guidance on household electrics, see our electrical advice for UK homes.