RCD Trips When Washing Machine Starts

If your RCD trips when the washing machine starts, the appliance may have developed an internal electrical fault. Washing machines use heating elements, pumps, and motors that can cause earth leakage when damaged. This guide explains the most common causes, safe checks you can carry out, and when to call 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 a Washing Machine Trips the RCD

Faulty heating element inside the machine
Water leaking onto internal electrical parts
Damaged power cable or plug
Motor insulation fault
Overloaded circuit shared with other appliances
Internal component failure

Safe Checks You Can Carry Out

Unplug the washing machine and reset the RCD
Try running the machine on an empty cycle
Check the power cable for visible damage
Ensure the socket is dry and undamaged
Avoid using extension leads for large appliances
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 the RCD only trips when the washing machine runs, the appliance may need repair.

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 overnight even with appliances unplugged, the issue may be within the fixed wiring.

The RCD trips instantly when reset
The problem occurs frequently overnight
The affected circuit cannot be identified
There are burning smells or buzzing sounds from sockets or the consumer unit

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.

If you’re dealing with recurring faults or safety concerns, it may help to speak with a local electrician who can assess the issue properly.

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.

If your RCD continues to trip frequently, see our guide on why an RCD or circuit breaker keeps tripping.