RCD keeps tripping: why it happens and what to do
The RCD (residual current device, or 'diferencial') protects people from earth leakage. When it trips repeatedly it is not a minor nuisance: it is the protection warning that something is wrong.
Why it trips
- A faulty or damp appliance (washing machine, water heater, oven, air conditioning).
- Damp in a socket, a junction box or outdoor wiring.
- Damaged or poorly insulated cables.
- Small leakages from several appliances adding up.
How to find the cause
- Unplug every appliance in the home and reset the RCD.
- If it holds, plug appliances back in one by one until it trips again.
- If it trips with one particular appliance, stop using it: it is faulty.
- If it trips with nothing connected, there is a problem in the installation.
What not to do
Do not keep resetting it without finding the cause, and never bypass or disable it. Do not tamper with the inside of the consumer unit unless you have the knowledge to do so.
When to call a professional
- It trips with nothing connected.
- It trips often for no obvious reason.
- There is a burning smell, a hot socket or sparks.
- You cannot tell which circuit or appliance causes it.
Send us a photo and your area on WhatsApp: we will advise you and give you a quote. We reply within 2 hours during working hours (Monday to Saturday, 8:00 to 19:00, excluding public holidays).
Frequently asked questions
What is the difference between the RCD and the circuit breaker?
The RCD protects against earth leakage and contact with live parts; the circuit breaker protects against overloads and short circuits.
Can I just switch it back on?
Once, to check, yes. If it trips again there is a cause to find.
How do I contact you?
By WhatsApp with a photo of the consumer unit and what is happening.