What is this?
When a single room loses power, it usually means the circuit feeding that room has tripped or has a fault. Most UK homes have separate circuits for different areas, so a problem on one circuit will not affect others.
Common causes
- MCB (miniature circuit breaker) for that circuit has tripped
- Loose connection at a socket or junction box in the circuit
- Faulty appliance on that circuit causing the MCB to trip
- Damaged cable in the wall or under the floor
- Overloaded circuit drawing more current than the MCB rating
Is it dangerous?
This is not immediately dangerous but should not be ignored. A tripped MCB is doing its job protecting you from a fault. If the MCB trips repeatedly, there is an underlying issue that could become serious if left unresolved.
Can I fix it myself?
Check your consumer unit for a tripped MCB — it will be in the off or middle position. Try resetting it once. If it stays on, unplug everything in that room and plug items back in one at a time to find the faulty appliance. If the MCB trips with nothing plugged in, you need an electrician.
When to call an electrician
Call an electrician if the MCB trips again after resetting, if it trips with nothing plugged in, or if you cannot identify the tripped MCB. Also call if you notice any burning smell or discolouration on sockets in that room.
What will an electrician do?
Identify which circuit supplies the affected room
Test the circuit for faults using insulation resistance testing
Check all connections at sockets and junction boxes on the circuit
Locate and repair any cable damage or loose connections
Replace the MCB if it is faulty
Typical cost
£80 – £200
Straightforward MCB replacements are at the lower end. Hidden cable faults requiring access to walls or floors will cost more.
