Why Are My Lights Flickering? Common Causes & When to Call an Electrician
Quick Answer
Flickering lights can be as simple as a loose bulb or as serious as a loose wiring connection. Common causes include an old or poorly seated globe, a faulty switch or dimmer, voltage fluctuations from the grid, or a loose connection in the circuit. Flickering that's isolated to one light is usually minor; flickering across multiple lights, especially when appliances switch on, can point to a wiring issue worth having checked by a licensed electrician.
What Could Be Causing the Problem?
- A loose or failing globe/bulb, especially with older halogen or incandescent fittings
- A faulty light switch or dimmer switch not rated for the globe type (common with LED retrofits)
- Loose wiring connections at the light fitting, switch or switchboard
- Voltage fluctuations on the electricity network, particularly during peak demand
- An overloaded circuit, especially if flickering happens when other appliances (like the air conditioner) switch on
What Can I Safely Check?
- Try replacing the globe first — this solves the issue more often than people expect
- Note whether the flickering is limited to one light, one room, or happens across the whole house
- Check if flickering coincides with a specific appliance turning on (e.g. air conditioner, oven, pool pump)
- If it's a dimmer switch, check the globe is dimmable and compatible — many LED globes aren't
When Should I Call an Electrician?
- Flickering affects multiple lights or the whole house, not just one fitting
- Flickering happens at the same time as a burning smell, buzzing sound, or warm switch plate
- The problem persists after replacing the globe and checking the switch
- Lights flicker whenever a large appliance starts up
- You notice flickering alongside other electrical issues, like an RCD tripping
What Will an Electrician Check?
- Test voltage at the switchboard and affected circuits
- Inspect wiring connections at the light fitting, switch and switchboard for looseness or corrosion
- Check the load on the circuit to identify overloading
- Assess whether the switchboard or wiring needs upgrading to handle current household demand
- Confirm whether the issue is inside the property or related to the incoming power supply
FAQs
Frequently asked questions
Are flickering lights a fire risk?
Occasionally — a loose connection can generate heat over time. It's not usually an emergency, but persistent flickering, especially with warmth or a burning smell, should be checked promptly.
Why do my lights flicker when the air conditioner turns on?
This usually points to voltage drop caused by the large current draw of the air conditioner starting up, which can indicate wiring or capacity issues worth assessing.
Can LED globes cause flickering?
Yes — LED globes are sometimes incompatible with older dimmer switches designed for incandescent or halogen globes, which causes flickering or buzzing.
Is flickering worse in older homes?
Older wiring and switchboards are more likely to develop loose connections or struggle with modern household electrical loads, so flickering can be more common.
Should I ignore flickering if it only happens occasionally?
Occasional, brief flickering during storms or grid fluctuations is usually not a concern, but a pattern of regular flickering is worth having assessed.
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