Dishwasher won't start

Q: Dishwasher won't start

In Canada, when a dishwasher won't start, the most common cause is a door that isn't latched fully — a safety switch blocks the cycle until it clicks, so press the door firmly shut first. Next, check the panel for a control-lock, delay-start, or demo mode that's holding the cycle. If it's completely dead, check the breaker and the outlet under the sink or the disposal air-gap switch. A failed door latch switch is a modest DIY repair; a failed control board or touchpad is a job for an appliance technician. If you ever smell burning or hot plastic, stop and cut the power.

Frustrating, but a dishwasher that won't start is usually a small, free fix — most often the door just isn't latched hard enough, or a setting is quietly holding it back.

tuneWhat are you noticing?

Select anything that matches and the checklist below reorders to fit. Not sure? Skip it.

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Start here

In Canadian kitchens, start with the door. Push it firmly closed until you feel and hear the latch click, making sure no rack, tall item, or handle is holding it a hair open. Then press start. Free, and the single most common reason a dishwasher won't begin.

Ranked from real-world failure data. The order updates as you select what you’re noticing above.

Likely causes, in the order to check them

Showing the typical order

Beginner-friendly Doable, with care Safety-critical Call a pro

visibilityHow to check

warning Stay dry around the outletThe outlet and switches under a kitchen sink sit near water. Make sure your hands and the floor are dry before testing them, and never poke inside an outlet or the dishwasher's wiring. If a breaker trips again right after you reset it, don't keep resetting it — that repeat trip is a sign of a real fault for a licensed electrician.

Open the breaker panel and look for a dishwasher breaker sitting between on and off, or fully tripped. Switch it firmly off, then on, once.
If your dishwasher plugs into an outlet under the sink, confirm that outlet has power — plug a lamp or phone charger in to check.
If you have a disposal air-gap switch (a small switch by the tap that also runs the sink disposal), make sure it's turned on; some share a circuit with the dishwasher.
If power is confirmed and it's still dead, stop here — the fault is inside the unit and points to the control board rather than the supply.

buildNo tools schedule5 min

handymanHow to fix it

report Kill the power before the panel comes offBehind the door panel the latch switch is wired into 120 V. Switch off the breaker or unplug the unit and confirm it's dead before you open anything — a live circuit here can shock you. If the dishwasher is hardwired and you're not sure how to isolate it safely, this small job is worth handing to an appliance technician or electrician.

Cut power to the dishwasher, open the inner door panel to reach the latch assembly, unplug the old latch switch, fit a matching replacement, reconnect it, and confirm a clean click before restoring power.

Switch off the dishwasher's breaker, or unplug it if it plugs in under the sink. Confirm it's dead before touching any wiring — this is not optional.
Remove the screws around the inside edge of the door to lift off the inner panel and expose the latch assembly at the top.
Note how the wire connectors sit on the old latch switch (photograph it), then unplug them and remove the failed switch.
Fit the matching replacement latch/switch, reconnect the connectors the same way, reassemble the panel, restore power, and close the door to confirm a solid click and a cycle that now starts.

schedule40 min savings$20–60

Dishwasher door latch / switch assemblyMatch your brand and model number — latch assemblies are model-specific; the number is on the tag inside the door frame

gavel Check your province first AB: homeowner may do this · BC: homeowner may do this · ON: homeowner may do this · PE: homeowner may do this · QC: licensed professionals only
Owner replacement of a door latch/switch on a plug-in dishwasher is generally permitted; hardwired electrical connection work is licensed in some provinces — verify locally.

verifiedWhy this one goes to a pro

The control board and touchpad sit behind the panel with live 120 V connections, and a wrong-part or mis-wired board can damage the machine or shock you. In Canada this is a job for a licensed appliance technician — they can confirm a dead board quickly and source the exact part for your model.

Your notes travel with the request — what you saw, what you ruled out, when it started — so the pro arrives with a head start instead of a mystery.

sort

Why the list is in this order

We don’t sort by likelihood alone. We sort the way a good, honest tradesperson thinks: rule out the free, safe, common causes first. That’s why the cheap checks outrank the expensive repairs — and why anything dangerous gets a hard stop instead of a pep talk. The order exists to save you money, not to sell you anything.