Dishwasher Won't Start? Power, Latch, Lock and Fuse Checks

Dishwasher won't start because it is not getting power, because the door latch does not register, or because a control setting such as lock or delay is on. If the lights are on but nothing happens, suspect the latch or a setting. If it is totally dead, check the breaker and the thermal fuse.

Switch off the power before opening the control panel or touching any wiring.

Dishwasher won't start: what the symptoms say

What happens	Likely cause	First check
No lights, no sound	No power, tripped breaker, blown thermal fuse	Breaker, fuse
Lights on, will not start	Door not latched, lock or delay mode	Door and settings
Clicks but no start	Door latch or control relay	Latch, control
Hums but does not fill	Inlet valve or pump issue	Water supply, valve
Starts then stops	Float switch, leak sensor or door	Dry the base, check door

Quick facts: dishwasher won't start
Time needed	10 to 30 minutes for checks
Tools	Multimeter (optional), flashlight, screwdriver
Difficulty	Easy for settings and latch; moderate for fuse and switch
Safety	Power off at the breaker before opening panels

Checks in order

1. Check the breaker and reset it by switching it fully off and on.
2. Check the outlet if the dishwasher plugs in under the sink. A tripped GFCI on the circuit can cut power.
3. Close the door firmly. The latch must click. Look for dishes or a bottle blocking the door.
4. Check the control lock or child lock. Many models need you to hold a button for a few seconds to release the control lock.
5. Check delay start or a scheduled cycle that has not begun.
6. Press the start button firmly, and follow your model's start sequence, which may require pressing start within a short time after closing the door.
7. Check the water supply valve is open.
8. Look at the base for water that may have tripped the float switch.

Parts that stop the machine

Part	Sign	Fix
Door latch assembly	Clicks, no start, door does not catch	Replace latch
Door switch	Door closed but no response	Test, replace
Thermal fuse	Totally dead	Test, replace, check cause
Float switch	Starts then stops, or no start with water in base	Dry base, test float
Timer or control board	Erratic or dead controls	Technician

Testing the thermal fuse and switches

With the power off, a multimeter on continuity can test the thermal fuse and door switch. The fuse is usually behind the lower panel or control panel and is small and cylindrical. If it shows no continuity, it has blown, and the cause, such as overheating or a faulty control, should be found. Do not bypass a fuse.

Resetting the dishwasher

Cut power at the breaker for a couple of minutes, then restore it. Some models also reset by pressing certain buttons in sequence, as the manual describes. If a dishwasher won't start after a power cut or a surge, a reset often fixes it.

Is it worth repairing?

A latch, switch or fuse is usually worth replacing. A board can be costly. Compare the quote with the machine's age and the price of a new one.

What to tell the technician

Write down what you tried and what the panel showed: any lights, clicks or hums, and whether the lights come on at all. Say whether the machine stopped suddenly or slowly stopped working, and whether there was a power cut, a leak or a recent repair. A technician can then start from the right test, which is faster and often cheaper.

When to call a professional

Call if the machine stays dead after checking power and latch, if you suspect the board or fuse, or if you smell burning. Never open the lower panel with the power on.

Dishwasher won't start: the door and the controls

When a dishwasher won't start, the first thing to check is whether the door is fully latched. Many models will not begin a cycle unless the latch closes and a switch sends the signal to the control. Open and close the door firmly, then press the start button again. If the display stays dark, check the breaker and the outlet or the wall switch that feeds the appliance.

Some dishwashers will not start if the cycle was already in progress and was interrupted. Cancel the cycle, wait a few minutes, and try again. A control panel that does not respond may have a faulty touch pad or a fault on the control board. A technician can test the switches and the board before any parts are replaced.

When a dishwasher won't start, the first check is the latch, not the motor. If the dishwasher won't start after a power cut, reset the breaker before calling anyone.

A dishwasher that won't start after a long idle period often needs its door latch and controls checked before anything else.

Write down the model number before you call, because the technician will ask whether the dishwasher won't start after a power cut or during a normal cycle.

Related reading

• Dishwasher Blinking Lights? What the Codes Mean and How to Reset
• Dishwasher Not Draining? 8 Checks Before You Call a Repair Pro
• Why Is My Dishwasher Leaking? 9 Sources and How to Fix Them
• Dishwasher Not Cleaning Dishes? 9 Causes and Fixes

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