Tripping & Circuit Breakers
RCDs, MCBs, and circuit breakers that keep tripping or won't reset.
RCD Keeps Tripping? Common Causes & How to Fix It (2026)
Your RCD keeps tripping and cutting power to multiple circuits. This guide covers every common cause — from faulty appliances and moisture to wiring faults and nuisance tripping — plus exactly what to do about it.
RCD Tripping At Night
Your RCD trips during the night, and you wake up to find the power off.
RCD Tripping When It Rains
Your electrics trip whenever it rains, suggesting water is getting into your electrical installation.
Circuit Breaker Keeps Tripping
A circuit breaker in your consumer unit keeps tripping, cutting power to part of your home.
Circuit Breaker Won't Reset
A trip switch in your consumer unit will not stay in the on position no matter what you try.
Fuse Keeps Blowing
A fuse in your fuse box or a plug fuse keeps blowing and needs replacing repeatedly.
Consumer Unit Tripping With Nothing Plugged In
Your consumer unit trips even when no appliances are plugged in, pointing to a fault in the fixed wiring.
Trip Switch Goes Off Randomly
A trip switch in your consumer unit goes off at random times with no obvious pattern.
MCB Keeps Tripping
A specific MCB (Miniature Circuit Breaker) in your consumer unit keeps tripping off.
RCBO Keeps Tripping
An RCBO in your consumer unit keeps tripping, cutting power to a single circuit.
Electrics Trip When I Plug Something In
Your electrics trip the moment you plug in a specific appliance or device.
Upstairs Circuit Keeps Tripping
The circuit supplying power upstairs keeps tripping, leaving the upstairs without electricity.
Downstairs Circuit Keeps Tripping
The circuit supplying power downstairs keeps tripping, leaving the ground floor without electricity.
Lighting Circuit Keeps Tripping
Your lighting circuit keeps tripping, plunging rooms into darkness.
Related Cost Guides
Electrical Fault Finding Cost
Electrical fault finding in the UK typically costs between £80 and £250, covering a diagnostic visit and testing to identify the source of electrical problems such as tripping circuits, power loss, or flickering lights.
Fuse Box Replacement Cost
Replacing a fuse box (consumer unit) in the UK typically costs between £350 and £800, including the unit itself, labour, and certification. Upgrading to a modern consumer unit with RCD protection is one of the most important electrical safety improvements you can make.
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