Sockets Not Working But Lights Are Fine

What's happening?

In UK homes, lighting and socket circuits are separate. When sockets stop working but lights remain on, it means the socket ring circuit (or radial circuit) has a fault while the lighting circuits are unaffected.

What usually causes it?

• MCB protecting the socket circuit has tripped
• RCD has tripped affecting only socket circuits
• Break in the ring circuit (loose connection or damaged cable)
• Faulty socket causing the circuit to trip
• Overloaded socket circuit

Is it dangerous?

Not immediately dangerous, but a tripped circuit indicates a fault. If the MCB trips repeatedly, there could be a short circuit or earth fault that needs professional attention. Do not bypass the protection by using higher-rated fuses.

Can I fix it myself?

Check your consumer unit for a tripped MCB or RCD. Try resetting it. If it stays on, the problem may have been a temporary overload. If it trips again, unplug everything and try again. If it still trips with nothing plugged in, you need an electrician.

When should you call an electrician?

Call an electrician if the MCB trips with nothing plugged in, if resetting does not restore power to sockets, or if only some sockets on the circuit are affected (suggesting a break in the ring).

What will the electrician actually do?

• Identify which socket circuits are affected
• Test ring circuit continuity (R1, Rn, R2 tests)
• Locate any breaks in the ring or loose connections
• Test insulation resistance to find earth faults
• Repair connections and replace any damaged sockets or cables

Who fixes this

• Electrical fault finding
• Emergency electrician

What it usually costs

Electrical Fault Finding Cost

Priced on survey

Emergency Electrician Cost

£80–£100 / hour

Questions people ask

Sources & References

1. BS 7671: IET Wiring Regulations (18th Edition)
2. IET: BS 7671 Guidance Publications
3. Electrical Safety First: Safety Guidance
4. NICEIC: Householder Guidance