USB Socket Not Working

The USB charging ports built into your wall socket have stopped working, even though the main plug sockets are fine.

What's happening?

Many modern UK sockets come with built-in USB-A or USB-C charging ports. These are powered by a small internal converter that steps the 230V mains down to 5V DC. When the USB ports stop working but the main sockets still function, the internal USB converter has usually failed. These converters have a limited lifespan and can fail due to heat, power surges, or component degradation. The main socket outlets are on a separate internal circuit and continue to work independently.

What usually causes it?

Internal USB converter module has failed due to age or heat
Power surge has damaged the low-voltage converter electronics
Loose internal connection between the mains supply and the USB converter
USB port physically damaged from cable insertion
Incompatible device or cable not triggering the charge circuit

Is it dangerous?

A non-working USB port is not dangerous. The main socket outlets are unaffected and safe to use. However, if the USB port is producing heat, has a burning smell, or is visibly discoloured, the internal converter may have shorted and should be checked.

Can I fix it myself?

Try a different USB cable and device first — some cables are charge-only and some devices require specific protocols. Check if the device charges from a separate USB plug adapter in the main socket. Clean any lint or debris from the USB port with a dry toothbrush. If none of these help, the internal module has failed and the socket needs replacing.

When should you call an electrician?

Call an electrician if you want the USB socket replaced with a new one. While the fault is not urgent, an electrician needs to do the replacement since it involves working on a mains-connected device. Also call immediately if the USB port is producing heat or a burning smell.

What will the electrician actually do?

Isolate the circuit and remove the faulty socket
Confirm the USB module has failed rather than a wiring issue
Fit a replacement USB socket with matching specification
Test the new socket for correct operation on both USB and mains outlets

What will it cost to fix?

£60–£120

The main cost is the replacement socket (USB sockets cost around £15-£30) plus labour for fitting. A straightforward swap takes 15-30 minutes.

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Frequently asked questions

We’re happy to answer all your questions.

Why have my USB ports stopped charging?

The small internal converter that powers the USB ports has most likely failed. These electronic components have a limited lifespan, typically 3-5 years with regular use. The main sockets are not affected.

Can I replace the USB socket myself?

Replacing a socket involves working on mains wiring and should be done by a qualified electrician. While the wiring is straightforward, getting it wrong can be dangerous.

Are USB sockets worth replacing?

USB sockets are convenient for charging phones and tablets. When replacing, consider getting one with USB-C ports as these support faster charging speeds and are the current standard.

Could the USB port damage my phone?

A faulty USB converter could theoretically deliver incorrect voltage, but modern devices have built-in protection. If the port is not working at all, it will not damage your device.

Sources & References

Socket Not WorkingCaution Socket Cracked Or DamagedHigh risk One Side Of Double Socket Not WorkingCaution Socket Installation Cost£80–£250 Electrical Fault Finding Cost£80–£250

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