Have you ever noticed your lights dimming when you turn on certain appliances? While it may just seem like a little inconvenience, it’s best not to ignore it. The change in your lights is an alert to a larger, more significant issue that could lead to complications for your home if the problem is not fixed.
Why Lights Dim When You Turn on Large Appliances
When you switch on a large appliance, it will need a surge of energy to turn on. This change in voltage, called an inrush current, draws extra energy to start the appliance and often causes lights to dim as energy is temporarily drawn from them.
Which Appliances May Need a Surge of Energy When Turned On?
- Air conditioner
- Clothes washer
- Clothes dryer
- Electric stove
- Microwave
- Refrigerator
The power grid in Orlando, Florida, can also experience low or intermittent power, increasing the chances that your home’s lights can flicker or dim when appliances are switched on. If you experience an unusual light dimming, checking online for local power outages can alert you to problems outside of your home that may cause this. But if there are no power outages or problems with the power provider, then the surge causing your lights to dim is coming from inside your home. If you can rule out your power provider, a call to Orlando Mister Sparky can help with the problem causing your dimming lights.
Common Reasons for Voltage Drops When You Turn on Large Appliances
There are a few reasons why a power surge can pull voltage from your lights, causing them to dim. A certified electrician can check out spots inside and outside of your home to check for problems that can lead to unsafe voltage drops.
Overloaded Circuits 
A single circuit in your home may have too many high-demand appliances connected to it, causing voltage drops when the energy is over capacity. If an overloaded circuit is powering more than one large appliance, like both a washer and a dryer, then turning them both on could cause the lights to dim or trip the breaker.
How to Check For This: One way to test if you have an overloaded circuit is to check which appliances are connected to each circuit. Turn on a single appliance at a time and note whether or not the lights dim with each. Identifying which appliances and lights share the same circuit can help you know if you have a potentially overloaded circuit and need an electrician to remedy the problem.
Insufficient Wiring
Modern appliances require larger voltage pulls than many older homes are equipped to provide. Wiring that was installed incorrectly, or wires that have degraded over time, may cause voltage surges in your home, causing your lights to dim or more serious problems if the wires fail or break completely.
- How to Check for This: If you suspect your writing may be the problem, you can visually inspect wiring. Look for fraying of the insulation surrounding the wires or any discoloration of the areas around an outlet or switch that may indicate problems with the wiring.
Neutral Wire Sharing
Some circuitry setups include a shared neutral wire between more than one circuit. If the shared neutral wire becomes loose or is faulty, the voltage can become imbalanced between the circuits it serves. This imbalance can cause lights to dim when the voltage sags for one of the parts of the shared neutral wire.
How to Check for This: To learn if neutral wire sharing is causing a problem with your lights, a certified electrician can evaluate your wiring for this type of structure.
Issues with Utility Service
If your external power supply is low or a local transformer is malfunctioning, you may see problems in your home like dimming lights. These issues, including power grid failure, will cause a reduction in voltage in your home.
How to Check for This: If you suspect problems with your home’s utility service, contact your local provider for updates or information about the situation.
When to Call for Professional Help
Lights that dim once or only occasionally are not typically indicative of a larger problem. But when some situations occur, it’s time to call your local electrician, like Mister Sparky Orlando, for an evaluation of your home to make sure you are safe from future damage or problems.
- When the lights dim in multiple rooms at the same time or for more than one second
- When multiple appliances cause the light to dim
- When you hear a buzzing sound at the same time as a light dimming
- When you notice heat coming from an outlet
- When you see discoloration at an outlet
- When you have recently added a workshop or a large appliance to your home
How to Fix The Problem
A certified electrician can assess the problem in your home causing your lights to dim when an appliance is turned on, and they will usually recommend one of these solutions.
- Adding dedicated circuitry panels for new or large appliances
- Improving or replacing old or faulty wiring
- Upgrading outdated electrical panels
Call Mister Sparky Orlando To Keep Your Home Safe
If your lights dim when you turn on appliances, it may be alerting you to a problem that can result in a dangerous situation for your home. Don’t put up with any malarky, call Mister Sparky to have your circuits and wiring evaluated so you know that your home and family will be safe from malfunctions resulting from power surges.
FAQ’s – Lights Dimming When Appliances Start
Why do my lights dim when I turn on appliances?
Lights may dim because large appliances draw a surge of electricity when they start, temporarily lowering voltage on the circuit.
Is it normal for lights to dim when an appliance starts?
A slight, brief dimming can be normal, but frequent or severe dimming may indicate electrical issues.
Which appliances commonly cause lights to dim?
Appliances like air conditioners, refrigerators, washing machines, and microwaves can cause temporary voltage drops.
Can dimming lights indicate an overloaded circuit?
Yes. If too many devices share the same circuit, the electrical load may exceed the circuit’s capacity.
Could an outdated electrical panel cause lights to dim?
Yes. Older panels may struggle to supply enough power when large appliances turn on.
Are loose wiring connections a cause of dimming lights?
Loose or damaged wiring can cause voltage fluctuations that lead to flickering or dimming lights.
Should I be concerned if lights dim throughout the house?
Whole-house dimming may indicate a problem with the electrical service, panel, or main wiring.
Who should inspect electrical issues causing dimming lights?
A licensed electrician at Orlando Mister Sparky can evaluate your electrical system and recommend repairs or upgrades.
