The Simple Causes: Things You Can Check Yourself

Loose or Poorly Seated Bulbs

Before you call anyone, check the obvious. A bulb that is not properly screwed in or seated in its fitting will flicker because the electrical contact is intermittent. Turn the light off, let the bulb cool down, and make sure it is firmly in place. With bayonet fittings (the twist-and-push type that is standard in most Australian homes), give it a gentle push and slight twist to make sure it is locked in properly. With Edison screw fittings, just make sure it is snug. If the bulb was loose and the flickering stops once you reseat it, problem solved.

Bulbs at End of Life

Old incandescent and halogen bulbs flicker as they near the end of their lifespan. The filament inside becomes thin and fragile, causing it to vibrate and produce an unsteady light. If you have got a single bulb flickering and it has been in there for a while, try swapping it out with a new one. If that fixes it, you are done. LED bulbs can also develop faults over time, particularly cheaper ones, so a replacement is always worth trying first.

Dimmer Switch Compatibility Issues with LEDs

This is one of the most common causes of flickering lights in Melbourne homes right now, and it catches a lot of people off guard. When you swap your old halogen downlights for LEDs (which is a great idea for energy savings), your existing dimmer switches may not be compatible with the new bulbs. Here is why.

Old dimmers were designed for incandescent or halogen bulbs, which draw a lot more power. These dimmers work by chopping up the electrical waveform, and they need a minimum wattage to function properly. A halogen downlight might draw 50 watts, but the LED replacement draws just 7 or 8 watts. When the dimmer cannot handle that low wattage, you get flickering, buzzing, or the lights refusing to dim smoothly. They might also glow faintly when switched off, which is another sign of incompatibility.

The fix is straightforward. You need a dimmer switch that is rated for LED use. We install these regularly across Melbourne, from older homes in Hawthorn and Kew that have had LED upgrades to new builds in Southbank. A quality LED-compatible dimmer from Clipsal or HPM makes all the difference, and the installation only takes about 20 minutes per switch.

Electrical Causes: When the Problem Is in Your Wiring

Loose Wiring Connections

This is where things get more serious. Loose connections at a light fitting, switch, junction box, or inside your switchboard can cause intermittent contact. When the connection is not solid, the current flow is disrupted and the light flickers. Over time, a loose connection generates heat because of arcing, which is exactly how electrical fires start.

Loose connections are particularly common in older Melbourne homes. Every time a tradie has worked on the wiring over the decades, connections have been made and remade. Add in decades of thermal expansion and contraction (Melbourne’s weather swings from 40-degree summers to single-digit winter mornings, which puts stress on connections), and things can work themselves loose. We see this a lot in the period homes throughout Carlton, Fitzroy, and Richmond, where the wiring has been added to and modified many times over 80 or 100 years.

You should not attempt to check or fix wiring connections yourself. Under Victorian electrical regulations, all electrical wiring work must be carried out by a licensed electrician with a current electrical work licence. This is not red tape for the sake of it. Working on live wiring without training and proper procedures is genuinely dangerous.

Overloaded Circuits

If your lights flicker when you turn on a particular appliance, like a heater, air conditioner, or hairdryer, you likely have an overloaded circuit. This happens when too many devices are drawing power from the same circuit, and switching on a high-draw appliance causes a momentary voltage dip that makes the lights on that circuit flicker or dim briefly.

This is incredibly common in older Melbourne homes that were wired decades ago when households had far fewer electrical appliances. A house built in the 1960s in suburbs like Bentleigh, Moorabbin, or Cheltenham might have been wired with only two or three circuits for the entire house. Today you have got air conditioning, dishwashers, clothes dryers, electric ovens, computers, and charging stations all drawing from wiring that was never designed for that load.

The solution is usually to add dedicated circuits for high-draw appliances. Your air conditioner, oven, and hot water system should each be on their own circuit. We also frequently add extra general power circuits to spread the load more evenly. This usually means upgrading the switchboard as well, which is a common job for us across Melbourne’s inner suburbs.

Old Aluminium Wiring

If your Melbourne home was built in the late 1960s or through the 1970s, there is a chance it was wired with aluminium cable instead of copper. During that period, the price of copper was high and aluminium was used as a cheaper alternative in many Australian homes. The problem is that aluminium oxidises over time, creating resistance at connection points. It also expands and contracts more than copper when it heats up, which loosens connections over time.

Aluminium wiring is not immediately dangerous on its own, but it requires specific connection techniques and compatible fittings. If your home has aluminium wiring and you are experiencing flickering lights, it is important to have an electrician inspect the connections. We will check for signs of overheating, ensure all connections are using appropriate anti-oxidant compound, and advise you on whether a rewire is necessary. In some cases, the most cost-effective long-term solution is to replace the aluminium wiring with modern copper cable, particularly if you are planning a renovation anyway.

Supply Side Issues: When It Is Not Your Wiring

Voltage Fluctuations from the Grid

Sometimes flickering lights are caused by voltage fluctuations from the electricity grid, and the problem is not inside your home at all. This can happen when there is a fault on the local distribution network, when nearby industrial equipment cycles on and off, or when your neighbourhood is experiencing high demand (like on a 40-degree Melbourne day when every air conditioner in the street kicks in at the same time).

Grid voltage in Australia should sit at 230 volts plus or minus 10 percent. If the voltage from the street is swinging outside that range, your lights will flicker and your appliances may behave erratically. We can measure the incoming voltage at your switchboard to check if this is the issue. If it is a supply-side problem, the next step is to contact your electricity distributor (CitiPower for inner Melbourne, or Powercor for western suburbs) and lodge a fault report.

Faulty Meter or Main Connection

The connection between the street mains and your switchboard, including the meter, the main fuse, and the service cable, can develop faults over time. A corroded main neutral connection is a classic cause of flickering lights throughout the entire house. If you notice that the flickering affects every light in your home and seems to be random, this could be the culprit.

Issues with the meter or main supply connection are the responsibility of your electricity distributor, but a licensed electrician can diagnose the problem and arrange for the distributor to attend and repair their equipment. We handle this coordination for our customers regularly.

Neighbour’s Load on a Shared Supply

In some older Melbourne apartment buildings, townhouse complexes, and period homes that have been subdivided into flats, the electrical supply can be shared or the neutral connection is common between properties. In these situations, heavy electrical usage next door can cause your lights to flicker. This is more common than you might think in the converted terrace houses and subdivided Victorian homes throughout suburbs like St Kilda, Prahran, and Fitzroy.

LED-Specific Flickering: The Modern Problem

LED lighting has transformed how we light our homes, but it has also introduced some new flickering issues that the old incandescent bulbs never had. Because LEDs run on very low power and are sensitive to the quality of the electrical supply, they can reveal problems in your wiring or switches that were previously invisible.

Incompatible Dimmer Switches

As mentioned above, this is by far the most common LED flickering issue. The fix is to install an LED-rated dimmer. Make sure the dimmer brand and model is listed as compatible with your specific LED bulbs. Most quality LED manufacturers publish compatibility lists on their websites.

Cheap or Low-Quality LED Bulbs

Not all LEDs are created equal. Budget LEDs from discount stores often have poor-quality drivers (the internal electronics that convert mains power to the low voltage the LED chip needs). A low-quality driver will produce flickering, especially on dimmer circuits. Investing in reputable brands like Philips, Osram, or Australian-made products makes a real difference in performance and longevity.

LED Drivers and Transformers

Some LED downlights and strip lights use external drivers or transformers. If these components fail or are mismatched with the LED, flickering results. When we install LED lighting, we always ensure the driver is correctly rated for the number and type of LEDs on the circuit. This is a detail that gets overlooked in DIY installations or when budget contractors cut corners.

When Is Flickering Dangerous?

Not all flickering is an emergency, but some situations require immediate attention. Call an electrician straight away if you notice any of the following alongside your flickering lights.

• A burning smell coming from a light fitting, switch, or your switchboard. This indicates overheating and is a fire risk.
• Scorch marks or discolouration around a switch plate, power point, or light fitting.
• A buzzing or crackling sound from switches, fittings, or your switchboard. This usually means arcing, which is dangerous.
• Warm or hot switch plates or power points. They should never be warm to the touch.
• Flickering throughout the entire house that is getting progressively worse. This suggests a main connection issue.
• Lights that dim significantly when appliances turn on, to the point where you notice a dramatic change. A slight, momentary dip can be normal, but a big, sustained dimming indicates an overloaded circuit or supply issue.

If you are in any doubt, err on the side of caution. Turn off the affected circuit at the switchboard if you can identify it, and call a licensed electrician.

What Does an Electrician Check for Flickering Lights?

When we attend a flickering lights callout, here is what we typically go through.

1. Visual inspection of the switchboard. We check for signs of overheating, loose connections, damaged circuit breakers, and overall condition. Many older switchboards in Melbourne still have ceramic rewirable fuses, which are well overdue for an upgrade.
2. Voltage and current testing. We measure the incoming voltage from the street, the voltage at the switchboard, and the voltage at the affected fitting. We also check for voltage drop across circuits, which can indicate poor connections or undersized cable.
3. Circuit loading analysis. We check how much load is on the affected circuit to determine if it is overloaded.
4. Insulation resistance testing. This checks the integrity of the cable insulation throughout the circuit. Deteriorated insulation can cause intermittent faults and flickering.
5. Connection tightness. We physically check the tightness of all accessible connections on the affected circuit, from the switchboard through to the light fitting.
6. Dimmer and switch testing. If dimmers are involved, we check compatibility and function.
7. Thermal imaging (where warranted). For hard-to-find faults, thermal imaging can reveal hot spots in wiring that indicate loose connections or overloaded cables hidden behind walls.

Why Melbourne Homeowners Choose Carlin Co for Electrical Diagnostics

Diagnosing flickering lights properly takes patience and experience. It is not always a quick fix, and it requires an electrician who is willing to methodically work through the possible causes rather than just replacing the bulb and leaving. That is the standard we hold ourselves to at Carlin Co Electrical. REC 33210.

“When we had some considerable concerns and worries about our electrical system and flashing light loose sockets, Carlin Co were able to come out and address everything professionally. They explained what was happening in plain terms and sorted it all out. Highly recommend.”

Bernadette’s experience is exactly the kind of situation we deal with regularly. Flickering lights combined with loose sockets point to connection issues that need a thorough inspection, not a band-aid fix. We take the time to trace the fault properly and fix it right the first time.

“Fantastic and prompt service. Jackson turned up on time, got the work done to an incredibly high standard, and even took the time to walk me through a couple of things he spotted at the switchboard that were worth knowing about.”

That is what a proper diagnostic looks like. When we are at your home for one issue, we do not just put blinkers on. If we spot something at the switchboard that needs attention, we will let you know. No pressure, just honest advice so you can make an informed decision.

“I haven’t met a more polite, clear and friendly, quick to respond, and thorough sparky before.”

Clear communication matters. When we diagnose your flickering lights, we will explain what we have found in plain English, tell you what needs fixing, and give you a clear price before any work starts. No jargon, no upselling, just straight answers. Pride in every detail.

Melbourne Suburbs We Service for Flickering Light Repairs

Carlin Co Electrical is based in Melbourne and services homes and businesses across inner Melbourne. No matter where your flickering lights are, we can usually get to you the same day.

Book a Flickering Lights Inspection

Do not ignore flickering lights, especially if they are getting worse or you have noticed any of the warning signs above. A quick inspection by a licensed electrician can give you peace of mind or catch a problem before it becomes a safety hazard.

Call 0432 632 346
  
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Or email us at [email protected]. Carlin Co Electrical, REC 33210. The standard you would recommend.

Frequently Asked Questions About Flickering Lights

Why are my lights flickering after I switched to LED bulbs?

The most common reason is an incompatible dimmer switch. Older dimmers designed for halogen or incandescent bulbs often do not work properly with LEDs because LEDs draw far less power. The fix is to install an LED-rated dimmer switch. Cheap LED bulbs with poor-quality internal drivers can also cause flickering. Try a quality brand first, and if the problem persists, have an electrician check your dimmer compatibility.

Is it dangerous if my lights flicker occasionally?

Occasional, very brief flickering when a large appliance starts up (like an air conditioner) can be normal and is usually not dangerous. However, persistent or worsening flickering, flickering accompanied by buzzing or burning smells, or flickering throughout the entire house should be investigated by a licensed electrician. Loose connections cause arcing, which generates heat and can lead to electrical fires.

My lights flicker when the heater or air conditioner turns on. Is this normal?

A very slight, momentary dip when a large appliance starts up can be normal because the motor draws a surge of current at startup. However, if the dimming is significant or the lights flicker continuously while the appliance runs, it usually means the circuit is overloaded or the wiring is undersized. An electrician can add a dedicated circuit for the appliance to fix this.

How much does it cost to diagnose flickering lights?

A standard diagnostic visit typically takes 30 to 60 minutes and is charged at our standard service call rate. If the fix is straightforward (like replacing a dimmer switch or tightening a connection), we can usually do it on the spot and include it in the same visit. For more complex issues like rewiring a circuit, we will give you a separate quote. Call us on 0432 632 346 for current pricing.

Can I fix flickering lights myself?

You can safely check and reseat loose bulbs, and you can try replacing a flickering bulb with a new one to see if that fixes it. However, any work involving wiring, switches, fittings, or your switchboard must be done by a licensed electrician under Victorian electrical safety regulations. Working on electrical wiring without a licence is illegal and extremely dangerous.

My whole house is flickering. Should I turn off the power?

If every light in the house is flickering, particularly if it is getting worse, you should switch off the main switch at your switchboard as a precaution and call a licensed electrician. Whole-house flickering often indicates a problem with the main neutral connection or the supply from the street, which needs professional diagnosis. If you smell burning or see sparking, switch off immediately and call 000 if you believe there is an immediate fire risk.

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Need an Electrician for Flickering Lights?

If your lights are flickering and you cannot identify the cause, our general electrician team can diagnose the issue. Common solutions include upgrading your meter box or switchboard, installing a dedicated circuit for heavy appliances like split system air conditioners, or replacing faulty downlights.