If lights dim when a kettle is switched on, it is usually due to high current draw on the circuit.
Common Reasons Lights Dim
This issue is often related to electrical load.
- High power demand from kettle
- Shared circuits
- Loose wiring
- Poor connections
- Voltage drop
Safe Checks You Can Carry Out
You can carry out simple checks to confirm the cause.
- Try kettle on a different socket
- Check if other appliances cause the same issue
- Observe if lights return to normal quickly
For a full list of tools you can use, see our guide on best electrical tools for homeowners.
When to Call an Electrician
Further checks may be required.
- Lights dim excessively
- Problem affects whole house
- You notice flickering or buzzing
- Issue worsens over time
Need an Electrician?
If this issue keeps happening or you’re unsure what’s causing it, a qualified electrician can safely diagnose and fix the problem. Electrical faults can worsen over time, so it’s best to get professional advice rather than risk damage or injury.
If you’re dealing with recurring faults or safety concerns, it may help to speak with a local electrician who can assess the issue properly.
UK Electrical Safety Advice
Electrical faults can be dangerous. If you are unsure, always seek advice from a qualified electrician. This guidance is for general information only and does not replace a professional inspection.
For general guidance on household electrics, see our electrical advice for UK homes.
Related electrical problems
- Lights flickering or dimming
- LED lights flickering
- Power keeps cutting out in house
- Fuse blowing repeatedly
This issue is one of several common electrical problems found in UK homes. You can view other related electrical faults on our Common Electrical Problems (UK) page.