Why won't my RCD reset – Advice from Electriman, North London Electricians

Why Won't My RCD Reset?

An RCD (Residual Current Device) is a safety switch in your consumer unit (fusebox) that trips automatically when it detects electricity leaking to earth — which could mean danger to life. When it won't reset, it almost always means the fault is still there. Forcing it to stay on isn't possible by design, and that's protecting you.

What Does the RCD Actually Do?

It monitors the balance of electrical current flowing in and out of a circuit. If more than 30 milliamps goes missing (leaking through a fault or through a person), it cuts power in under 40 milliseconds.

Safe Checks You Can Do Yourself

Unplug every appliance connected to circuits protected by the tripped RCD — including lamps, phone chargers, kettles, washing machines, and TVs

Switch off all lighting circuits on the affected side if you can identify them

Try to reset the RCD — push it firmly up (or press the reset button depending on your board type)

If it holds, plug appliances back in one at a time, waiting a few seconds each time, until the RCD trips again — that appliance is faulty

Check for obvious signs — burn marks on sockets, smell of burning, a circuit that was wet (outdoor socket after rain, kitchen splash)

Common Causes

A faulty appliance (washing machines and dishwashers are frequent offenders)

A damaged extension lead or adaptor

Water ingress into an outdoor socket, light fitting, or shower unit

Worn wiring insulation causing an earth fault

A faulty RCD itself (less common but possible)

When You Must Call an Electrician

The RCD still won't reset after unplugging everything

It trips again immediately when you reset it

You can smell burning or see scorch marks

The fault is in a bathroom, kitchen, or outdoor circuit

The RCD trips repeatedly over several days

Never bypass or tape up an RCD. It exists to prevent fatal electric shock and fire. If in doubt, leave the circuit off and call a Part P registered electrician.

Need a qualified electrician in North London? Electriman covers Mill Hill, Barnet, Finchley, Edgware, Enfield and surrounding areas. Call us on 07701 366 284 or get a free quote at www.electriman.co.uk

Need a qualified electrician in North London?

Electriman covers Mill Hill, Barnet, Finchley, Edgware, Enfield, Watford and surrounding areas. All work is Part P certified and fully insured.