Why does my RCD keep tripping?
Common reasons an RCD trips, the safe checks a householder can make and when to call an electrician.
Updated 9 September 2026 · 5 min read
What an RCD trip usually means
An RCD is designed to disconnect the supply when it detects current flowing somewhere it should not. A single trip can follow a faulty appliance or a temporary problem, while repeated trips may point to damaged wiring, moisture, a deteriorating appliance or a fault on a particular circuit.
The RCD is a safety device, so repeatedly resetting it without finding the cause is not a repair.
Safe checks you can make
If there is no burning smell, smoke, visible damage or water near electrics, switch off and unplug portable appliances on the affected circuit. Reset the RCD once, then reconnect appliances one at a time. If one item causes another trip, leave it unplugged and arrange for it to be checked.
- Do not remove the consumer-unit cover
- Do not keep resetting a device that trips immediately
- Do not use electrical equipment that is wet, scorched or damaged
- Note which switch moves and what was running at the time
When an electrician is needed
Arrange an electrician when the RCD will not reset, trips with everything unplugged, affects fixed wiring or keeps returning without an obvious appliance cause. Burning, crackling, smoke or exposed live parts require urgent attention; move away from the hazard and call 999 if there is fire or immediate danger.
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