If your RCD (residual current device) keeps tripping, it is doing its job: cutting the power because it has detected a problem. That is frustrating when the lights go out, but it is not something to ignore or bypass.
An RCD watches for earth leakage — current escaping somewhere it should not. When that happens, it switches the circuit off. Repeated tripping usually means there is a fault that needs a proper test, not a workaround.
Common causes
A few everyday issues come up again and again:
- A damaged or damp appliance, such as a kettle, washing machine, dishwasher or outdoor tool
- A faulty socket, switch or light fitting
- Moisture getting into an outdoor socket, security light or garden supply
- A problem on a particular circuit, rather than the whole installation
- Wiring or accessory damage that is not obvious from the outside
The useful bit is working out whether one appliance is causing it, or whether the fault is in the fixed wiring. That is where testing helps.
What you can safely check
You do not need to open the consumer unit or start taking fittings apart. A few simple observations are enough:
- Has it only started since you plugged something in, used an outdoor socket, or had heavy rain?
- Does it trip as soon as you reset it, or only when a particular appliance or room is used?
- Have any sockets, switches or lights been damaged, loose or damp?
If you can unplug portable appliances and the RCD then holds, leave the suspect item unplugged and get it checked. If it trips again with everything unplugged, stop resetting it and call an electrician.
Do not tape an RCD in the on position, swap breakers around, or carry on resetting it if it will not hold. That removes a safety device that is trying to protect you.
When to call an electrician
Call if:
- The RCD will not reset, or trips again immediately
- You have lost power to part of the house
- There is burning smell, scorching, buzzing or a socket that feels hot
- Water has got into fittings or an outdoor supply
- You are not sure what is going on and would rather it was tested properly
I can test the circuit, find the cause and repair the fault. A lot of tripping problems look similar from the outside. The job is to find whether it is a damaged accessory, a failing appliance, a damp fitting or something further back on the circuit.
If I can repair it there and then, I will. If it needs parts or a follow-up visit, you will get a clear explanation and a price first.