Dishwasher Lights Flashing and Will Not Start

A dishwasher is one of the most convenient appliances in any household, so it can be frustrating when it suddenly malfunctions. One common issue homeowners encounter is when the dishwasher lights are flashing and it will not start. This problem is often a sign that something is wrong with the unit's components or operational settings. Explore the possible reasons for flashing lights, provide actionable steps for troubleshooting, and discuss how to prevent this issue in the future.

Key Reasons for the Problem:

40% of reported issues are the

Door Latch Assembly

35% of reported issues are the

Control Board

20% of reported issues are the

Control Panel/UI Board

5% of reported issues are the

All Other Causes

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Diagnostic and Troubleshooting Steps

Are your dishwasher lights flashing and it won’t start? This step-by-step guide covers everything from door latches to control boards, offering practical solutions.

Step 1:

Reset the Dishwasher

Start by resetting the dishwasher. Unplug it from the power source for 5–10 minutes, or turn off the circuit breaker.
After reconnecting, see if the lights stop flashing and the unit starts.

Step 2:

Check the Door Latch

Ensure the dishwasher door is fully closed and latched. If the latch is loose or damaged, consider replacing it.

Step 3:

Inspect the Control Panel

Look for stuck buttons or moisture buildup around the control panel.
Clean the buttons gently with a dry cloth and avoid pressing multiple buttons at once.

Step 4:

Verify Water Supply

Confirm that the water supply is turned on and the inlet hose isn’t kinked or blocked. You may also need to clean the water inlet valve.

Step 5:

Clean the Drainage System

Check for clogs in the drain hose, filter, or garbage disposal connection.
Use a cleaning brush or pipe cleaner to remove debris that could be causing drainage issues.

Step 6:

Inspect the Float Switch

Locate the float switch at the bottom of the dishwasher tub. Ensure it moves freely up and down. If it’s stuck, clean it to remove any dirt or residue.

Step 7:

Review Error Codes

Consult your dishwasher’s manual to interpret the flashing light patterns. Many models provide error codes that pinpoint the problem.

Step 8:

Test the Power Source

Check your electrical outlet, circuit breaker, and power cord to ensure the dishwasher is receiving adequate power.
Repair or replace damaged cords as needed.

Step 9:

Run a Diagnostic Test

Some dishwashers allow you to run a diagnostic cycle to identify issues. Refer to your user manual for instructions specific to your model.

Key Actions for Homeowners:

Regularly clean the filters, spray arms, and drainage system to prevent clogs.
Don’t overfill the dishwasher, as it can strain the machine and lead to malfunctioning sensors.
Periodically check the door latch for signs of wear or damage.
Only use dishwasher-specific detergents to avoid excess suds.
Ensure the water inlet hose and valve are in good condition and free from blockages.
Refer to your dishwasher’s user manual for maintenance recommendations and troubleshooting tips.

Most Common Repairs Needed to Fix Dishwasher Flashing Lights

When your dishwasher is flashing but won’t start, certain repairs are more commonly required than others. Below are the most frequent fixes:

Replace the Door Latch or Switch: A faulty door latch or switch can prevent the dishwasher from starting.
Repair or Replace the Control Board: If the control board is damaged or malfunctioning, it may send incorrect signals, causing the lights to flash.
Fix or Replace the Touchpad or Button: Stuck or unresponsive buttons on the control panel can confuse the dishwasher’s system.

Frequently Asked Questions

Why are the lights on my dishwasher flashing, and it won't start?
Flashing lights on a dishwasher often indicate an error or malfunction. Common reasons include a faulty door latch, issues with the control board, stuck buttons on the control panel, or a clogged drain system. Refer to the user manual for error code explanations specific to your dishwasher model.
How can I reset my dishwasher to stop the lights from flashing?
To reset most dishwashers, turn off the power by unplugging the unit or switching off the circuit breaker for 5–10 minutes. Reconnect the power and check if the flashing lights persist. If the issue remains, it may require further troubleshooting or professional repair.
Could a blocked drain system cause my dishwasher lights to flash?
Yes, a clogged drain system, including the filter, drain hose, or pump, can trigger error codes or flashing lights. If the dishwasher detects improper drainage, it may prevent the cycle from starting until the blockage is cleared.
When should I call a professional for flashing dishwasher lights?
If basic troubleshooting like resetting the unit, cleaning the filters, or checking the door latch doesn't resolve the issue, it’s best to contact a professional. Issues like faulty control boards, wiring problems, or sensor malfunctions often require expert repair.

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