What to Do If a Fuse Keeps Tripping (UK Step by Step Guide)
Quick Safety Checklist
Keep hands dry
Stand on a dry surface
Use a torch if power is off
Never remove consumer unit covers
Step 1: Stay calm and don’t force it
If a fuse or circuit breaker trips, it’s doing its job protecting you from overloads, faults, or electric shock risks. Do not repeatedly force it back on without checking first.
Step 2: Identify what has tripped
Open your consumer unit (fuse box) and look for:
MCB (circuit breaker) – usually one switch flipped down
RCD – a wider switch that controls multiple circuits
RCBO – looks like an MCB but only affects one circuit
Most modern UK homes use breakers rather than old wire fuses.
Step 3: Unplug appliances on the affected circuit
Before resetting anything:
Unplug all appliances on that circuit
Common culprits: kettles, toasters, washing machines, tumble dryers, heaters
Turn off any fixed appliances (cookers, showers) if possible
This removes the load and helps identify the problem.
Step 4: Reset the breaker or RCD
Push the tripped switch fully to OFF, then back to ON
If it stays on → move to Step 5
If it immediately trips again → skip to Step 7
Step 5: Plug appliances back in one by one
Reconnect items one at a time, waiting 30–60 seconds between each.
If the fuse trips when a specific appliance is plugged in:
That appliance is likely faulty
Stop using it immediately
💡 Tip: Kettles, heaters, and white goods are the most common causes.
Step 6: Consider overload vs fault
Ask yourself:
Were multiple high-power appliances running together?
Did it trip when turning something on?
Does it only happen at certain times?
Overload
✔ Too many appliances on one circuit
✔ Often fixed by spreading loads or upgrading circuits
Fault
❌ Damaged appliance
❌ Faulty socket
❌ Wiring issue
❌ Moisture ingress (outdoor sockets, garages, bathrooms)
Step 7: If the RCD keeps tripping
RCDs are very sensitive and trip when they detect a leakage of electricity to earth.
Common causes:
Faulty appliances
Water getting into sockets or outdoor electrics
Garden equipment
Bathroom or kitchen issues
If the RCD won’t reset even with everything unplugged, this usually means:⚠️ A wiring fault = electrician required
Step 8: Do not ignore repeated tripping
Repeated tripping is a warning sign. Ignoring it can lead to:
Electric shock risk
Appliance damage
Fire hazard
❌ Never wedge a breaker on
❌ Never replace fuses with higher ratings
❌ Never dismantle the consumer unit yourself
Step 9: Call a qualified electrician if:
✔ The breaker won’t reset
✔ The same circuit trips repeatedly
✔ You smell burning or see scorch marks
✔ Sockets feel warm
✔ Lights flicker or dim before tripping
A registered electrician can safely test:
The circuit
Insulation resistance
Appliance faults
RCD performance
Final Thought
A tripping fuse is not a nuisance, it’s protection. The key is identifying whether it’s a simple appliance issue or something deeper that needs professional attention.
Need help with your fuse board? Contact our qualified team of electricians:
01733 601698
If your fuse keeps tripping and you're trying to pinpoint the root cause, following the guide’s advice to methodically unplug appliances and reset your breakers can be lifesaving. While you're there, consider checking your mepco bill to ensure there aren’t any unusual spikes in usage that might hint at an overload issue. This proactive approach not only keeps things safe but might save you a call to the electrician if it’s just a case of too many gadgets on one circuit!