RCD Won't Reset?
Don't keep trying to force it. There's a fault that needs finding. We can diagnose and fix the problem quickly.
What is an RCD and Why Does it Trip?
An RCD (Residual Current Device) monitors the balance between live and neutral current on your circuits. If even 30 milliamps (0.03A) leaks to earth – which could happen through a person – it trips in under 40 milliseconds. That's fast enough to prevent a fatal shock. When it refuses to reset, there's an active fault drawing current to earth right now, and the RCD is correctly preventing you from energising a dangerous circuit.
The most common cause we find is a faulty appliance – washing machines, dishwashers, and immersion heaters are the usual suspects because their heating elements operate in wet environments. Over time, the element's insulation breaks down and current leaks through the water to the metal casing. The second most common cause is moisture ingress into outdoor sockets, garden lighting junction boxes, or bathroom fittings – especially after heavy Devon rain.
Important Safety Warning
Never attempt to bypass or disable an RCD. It's protecting you from potentially fatal electric shock. If it won't reset, the safest option is to call a qualified electrician.
Why Your RCD Won't Reset
Here are the most common reasons an RCD refuses to stay on.
Faulty Appliance
A damaged appliance is causing a current leak to earth. The RCD detects this imbalance and trips to protect you.
What to try: Unplug all appliances and reset. Plug them back one by one to identify the faulty item.
Damaged Wiring
Old or damaged cables can allow current to leak to earth, triggering the RCD repeatedly.
What to try: This requires professional investigation and potentially rewiring affected circuits.
Water Ingress
Moisture in sockets, light fittings, or junction boxes can cause earth leakage.
What to try: Check for damp around electrical fittings, especially in bathrooms and kitchens.
Faulty RCD
The RCD itself may have developed a fault and needs replacement.
What to try: An electrician can test the RCD and replace if necessary.
Nuisance Tripping
Some appliances (especially older fridges and freezers) can cause nuisance tripping due to small earth leakage currents.
What to try: Consider upgrading to an RCBO board for better circuit separation.
What You Can Try First
- 1
Unplug everything
Disconnect all appliances from the affected circuit(s). This includes things plugged in but switched off.
- 2
Try to reset the RCD
Push the switch firmly up. If it stays on, the fault is likely in one of your appliances.
- 3
Plug appliances back one at a time
When the RCD trips again, you've found your faulty appliance. Don't use it until it's been checked or replaced.
- 4
If it still won't reset
The fault is likely in your fixed wiring or the RCD itself. Time to call an electrician.
Frequently Asked Questions
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