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Why Do My Lights Flicker When the Washing Machine or Dryer Starts?

You start a load of laundry and notice the kitchen lights briefly dim. Or perhaps the lights in the hallway flicker whenever your dryer turns on.

It might happen for only a second, but it’s enough to make you wonder whether something is wrong with your home’s electrical system.

Lights that flicker or dim when a large appliance starts may be reacting to a temporary voltage drop, but repeated or significant flickering can indicate an electrical problem that needs professional evaluation.

In older Seattle homes, especially those that have been remodeled or upgraded over the years, understanding how circuits are connected can help identify the cause.

Why Do Lights Dim When a Large Appliance Starts?

Appliances with electric motors can draw a higher amount of current when they first start.

This temporary demand can cause a small voltage drop in the electrical system.

In some homes, the change is noticeable as a brief dimming of the lights.

A very slight, momentary change isn’t necessarily evidence of a dangerous condition.

However, lights that flicker repeatedly, dim significantly or change brightness throughout the house should be investigated.

1. The Appliance May Be Drawing Startup Current

Washing machines contain motors that operate during different parts of the wash cycle.

Some dryers also contain motors, while electric dryers use substantial electrical power for heating.

When equipment starts, electrical demand can change quickly.

If the home’s electrical system is operating correctly, it should generally handle normal appliance loads without substantial disruption.

Noticeable or worsening flickering may indicate that a connection, circuit or other component needs attention.

2. The Circuit Could Be Overloaded

An overloaded circuit occurs when connected equipment draws more current than the circuit is designed to carry.

For example, several appliances or devices operating on the same branch circuit may create excessive demand.

Modern electrical codes include requirements for laundry circuits, but older homes may have wiring arrangements that differ from current standards.

Don’t assume a washer or dryer is connected to the correct circuit simply because the outlet has always been there.

A qualified electrician can determine whether the circuit arrangement and conductor sizes are appropriate for the equipment.

Larry’s Electric provides residential electrical services for Seattle homeowners, including circuit troubleshooting and electrical upgrades.

3. Loose Electrical Connections Can Cause Flickering

Loose or deteriorated electrical connections are an important concern.

Connections may develop problems at receptacles, switches, junction boxes, breakers or service equipment.

Under electrical load, a poor connection can produce abnormal voltage changes, overheating or arcing.

Warning signs may include:

• Lights flickering in multiple rooms
• Brightness changing unpredictably
• Buzzing or crackling sounds
• Discolored electrical outlets
• A burning smell near electrical equipment
• Lights becoming unusually bright as well as dim

If you notice burning odors, smoke or signs of overheating, stop using the affected equipment and seek prompt professional assistance.

Don’t open an electrical panel or attempt to tighten energized connections yourself.

4. Your Electrical Panel May Need Evaluation

Electrical panels distribute power to circuits throughout the home.

An older or deteriorating panel may have connection or breaker problems that contribute to abnormal electrical behavior.

However, flickering lights alone don’t prove that the panel needs replacement.

An electrician should inspect the relevant circuits and connections before recommending a major upgrade.

If you’re concerned about your panel’s condition, Larry’s Electric provides electrical panel installation and upgrade services.

5. Could the Problem Be With the Utility Service?

Yes.

If lights throughout the house flicker, particularly when multiple appliances operate, the issue may involve the electrical service or utility connection.

A loose or failing neutral connection can create dangerous voltage imbalances.

One warning sign is lights in different parts of the home becoming brighter and dimmer unexpectedly.

This situation deserves urgent attention because abnormal voltage can damage appliances and create electrical hazards.

A qualified electrician or the electric utility can help determine where the problem originates.

6. Why Does It Happen Only With the Dryer?

Electric dryers typically operate on a 240-volt circuit, while many washing machines use a standard 120-volt circuit.

If flickering happens specifically when the dryer operates, the cause may involve the dryer’s circuit, the home’s electrical service or another connection affected by the load.

It’s also possible that the appliance itself has an electrical or mechanical problem.

The fact that one appliance triggers the flickering is a useful diagnostic clue, but it doesn’t identify the failed component.

7. Could LED Light Bulbs Be Making the Problem More Noticeable?

Some LED lamps and drivers are sensitive to voltage changes.

They may visibly flicker under conditions that produce little noticeable change in other lighting types.

Compatibility with dimmer switches can also affect LED performance.

However, don’t assume the bulbs are responsible when flickering consistently occurs as large appliances start.

Electrical supply and connection problems should be ruled out when symptoms are significant or recurring.

What Should You Check Before Calling an Electrician?

You can gather useful information without opening electrical equipment.

• Notice whether the lights flicker only when one appliance starts.
• Check whether the problem affects one room or several rooms.
• Observe whether lights briefly dim or repeatedly brighten and dim.
• Note any breaker trips or unusual appliance behavior.
• Record whether the problem is becoming more frequent.

Share these observations with your electrician.

Do not remove panel covers, inspect exposed wiring or attempt repairs inside energized electrical equipment.

When Is Flickering an Electrical Emergency?

Seek urgent professional assistance if flickering occurs with burning smells, smoke, sparking, unusual heat or rapidly changing brightness throughout the home.

Significant brightening and dimming may indicate a dangerous service or neutral problem.

Stop using affected equipment when it is safe to do so, and contact a qualified electrician or utility provider.

If there is an active electrical fire, evacuate and call emergency services.

Frequently Asked Questions

Is it normal for lights to dim when a washing machine starts?

A very brief, slight dimming can occur when a motor starts. Significant, repeated or worsening flickering should be evaluated.

Can an overloaded circuit cause lights to flicker?

Yes. Excessive electrical demand can contribute to voltage changes, although loose connections and other problems can produce similar symptoms.

Does flickering mean I need a new electrical panel?

Not necessarily. An electrician should identify the cause before recommending panel replacement.

Why do LED lights flicker when the dryer starts?

Some LEDs respond visibly to voltage changes. The dryer may be revealing an electrical supply or connection problem rather than a problem with the bulbs.

Should I stop using my washer if the lights flicker?

If flickering is substantial, worsening or accompanied by other warning signs, stop using the affected equipment until the problem is evaluated.

Get to the Source of Electrical Flickering

Lights that dim when appliances start can be caused by several different conditions. The important step is identifying whether the behavior is a minor startup effect or a warning sign of a wiring or service problem.

Larry’s Electric provides electrical troubleshooting and residential electrical services in Seattle and surrounding communities.

If your lights flicker when the washer, dryer or other large appliances operate, contact Larry’s Electric to discuss an electrical inspection.