Symptômes :Symptoms:

Dishwasher Won’t Start? 6 Causes Ranked by Likelihood (With Tests)

Most non-starts trace back to a door that isn’t fully latched, a tripped breaker, or an accidentally engaged control lock, not a failed control board.

Risk: Low
Difficulty: Beginner
Estimated time: 10 to 25 minutes

Before any repair attempt

Unplug the appliance, shut off the water if needed, and stop immediately if you smell burning. When in doubt, call a qualified professional.

On this page

Tools needed
Probable causes
First checks
Step-by-step diagnosis
Mistakes to avoid
When to stop
Parts potentially involved
When to call a professional

Press start and nothing happens: no hum, no lights, no cycle. Before you assume the control board has failed, work through a short list of things that stop most dishwashers from starting: the door latch, the power supply, and a control lock a lot of owners don’t even know exists.

For the rest of the symptoms we cover, see our full dishwasher troubleshooting guide. If yours starts but then stops partway through, check dishwasher not draining instead.

Quick Diagnosis Table

Cause	Likelihood	Difficulty	Typical Cost
Door not fully latched	Very likely	Easy	$0
Tripped breaker or GFCI outlet	Likely	Easy	$0
Control lock (child lock) engaged	Likely	Easy	$0
Delay start set by mistake	Possible	Easy	$0
Door switch failed	Possible	Moderate	$15–40
Main control board failed	Rare	Professional recommended	$150–300+

Repair or Replace?

Everything above the control board is free or under $40, so repairing wins here almost every time. A dishwasher under 8 years old is worth fixing even at the higher end of a board replacement; past that, weigh the quote against a new unit, since board failures often show up alongside other aging parts.

Door latch and switch designs vary by brand. Whirlpool, GE, Samsung, LG, Bosch, KitchenAid, Frigidaire, and Maytag each mount the switch a little differently behind the door panel. Brand-specific guides for this symptom are coming.

Frequently Asked Questions

The display is completely dark, not just unresponsive. Does that change anything?

Yes. A blank display almost always means a power problem, so check the outlet, breaker, and door switch (which cuts power when open) before anything else on this page.

Can a full silverware basket really stop the door from latching?

Yes, tall items in the top rack or a utensil basket pushed too high are one of the most common reasons a door looks closed but the latch never engages.

My dishwasher starts, then stops immediately. Is that the same problem?

No, that's usually a water supply or door-lock-confirmation issue partway through the fill, not a start failure. Check the inlet valve rather than the door latch.

How do I know if the control lock is on?

Most models show a small padlock icon on the display. Hold the control lock button (check your manual for the exact one) for about 3 seconds to release it.

This is intended to help you narrow down the cause, not to stand in for a qualified technician’s diagnosis.

Tools needed

Multimeter
Flashlight
Phillips screwdriver

Probable causes

Very likely Door not fully latched
Likely Tripped breaker or GFCI outlet
Likely Control lock (child lock) engaged
Possible Delay start set by mistake
Possible Door switch failed
Rare Main control board failed

First checks

Push the door firmly closed and listen for the latch to click before pressing start again.
Check the breaker panel and any GFCI outlet under the sink, reset if tripped.
Look for a small padlock icon on the display, indicating the control lock is engaged.
Check for a delay-start countdown on the display and cancel it if present.

Step-by-step diagnosis

Close the door firmly and confirm you hear the latch click, then press start again.
Reset the breaker or GFCI outlet if tripped, then wait 60 seconds before restarting.
Hold the control lock button for about 3 seconds to clear it.
Cancel any delay-start setting shown on the display.
Test the door switch with a multimeter: it should show continuity when the door is closed and none when open, replace it if it doesn't switch correctly.
If the switch tests fine and the dishwasher still won't start, the main control board is the likely remaining cause.

Mistakes to avoid

Forcing the door shut when something is blocking it, this can crack the latch mechanism.
Repeatedly power-cycling the breaker without checking the door switch first wastes time on a less likely cause.

When to stop

If the door switch tests fine with a multimeter and the dishwasher still won't start, the control board is the likely cause, and that's best left to a technician given the diagnostic equipment involved.

Parts potentially involved

When to call a professional

If the simple checks turned up nothing, if the repair involves electricity, gas, or the sealed refrigerant system, or if you have any doubt at all: stop there and hand the appliance over to a qualified technician.

Related guides

Error codes for this appliance

The information provided is a diagnostic aid and does not replace the intervention of a qualified professional.

Mis à jour le

25 August 2026

Updated on

August 25, 2026

Chriss R. — DiagnosFix

Réviseur technique

Dernière vérification : 2026-07-19