Diagnose the Type of Flicker First

  • One specific light flickers: Almost certainly a bulb, fitting or switch issue — DIY fixable
  • Multiple lights flicker simultaneously: Loose connection in the switchboard, overloaded circuit, or utility supply issue — call an electrician
  • Flickering when appliances turn on: Normal for large motors (fridge, air con, washing machine) starting — only a concern if lights dim significantly or breaker trips
  • Flickering gets worse over time: Wiring deterioration — electrician required

DIY Fixes — Try These First

  1. 1

    Turn off power and retighten the bulb

    Turn off the light switch. Wait for the bulb to cool if it was recently on. Tighten the bulb firmly in the socket — a loose bulb is the most common cause of flickering. Turn back on and test.

  2. 2

    Replace the bulb

    A failing bulb flickers as its internal components degrade. Replace with a new bulb of the same type and wattage. LED bulbs can flicker if they are low quality or incompatible with the circuit.

  3. 3

    Check dimmer switch compatibility

    LED bulbs require LED-compatible dimmer switches. Standard old dimmers cause LED flickering, buzzing and reduced lifespan. Replace with an LED-compatible dimmer switch (available at hardware stores for $20–40) or use non-dimmable bulbs on the existing dimmer.

  4. 4

    Check and clean the light socket contacts

    Turn off power at the switch AND the circuit breaker. Use a flathead screwdriver to very gently bend the centre contact tab at the base of the socket slightly upward — over time it can flatten and lose contact with the bulb base. This restores reliable contact.

  5. 5

    Check the light switch

    Worn light switches cause flickering. Toggle the switch several times — if flickering correlates exactly with switch movement, the switch needs replacing. A new switch costs $5–15 and is a straightforward DIY job if you are comfortable with basic electrical work.

When to call a licensed electricianFlickering in multiple rooms. Flickering accompanied by buzzing sounds in the walls. Lights that dim significantly when appliances run. Burning smell from a switch or fitting. Any flickering that simple bulb and switch fixes do not resolve. Electrical faults can cause fires — do not ignore persistent unexplained flickering.

Frequently Asked Questions

Occasional minor flickering from a loose bulb is not a fire hazard. Persistent flickering caused by loose wiring connections, overloaded circuits or arcing faults can cause electrical fires over time. If simple fixes do not resolve the flickering — especially if multiple lights are affected or there are any burning smells — have a licensed electrician inspect the wiring.
Some LED bulbs glow faintly or flicker when switched off — caused by a residual current in the wiring or a neon indicator in the switch leaking a small amount of current through the LED driver. Solutions: replace the switch with one without a neon indicator, use a different brand of LED bulb, or add a bypass capacitor (electrician job).