Dishwasher Leaking? Common Causes & What to Check

1. Record the leak location without running another cycle

From what you already observed, note whether the first water appeared at the front door, under the centre, behind the cabinet or at the sink connection. Also note whether it began during filling, washing or draining. Water can travel along the floor, so the final puddle may be away from the source. Photograph visible damp areas for the technician without removing panels.

2. Inspect the door edge and loading

With power off, look for food or a utensil caught along the door seal. Check whether racks are fully seated and dishes prevent the door closing normally. Wipe an accessible dirty gasket as the manual directs; cracks, a loose seal or a door that will not sit square need assessment. A damaged spray arm or misdirected spray can also send water toward the door, so a front leak does not automatically mean a gasket replacement.

3. Check for detergent-related suds

Hand dish soap and detergent left from pre-soaking can create excess foam in a dishwasher. Note which product and amount were used, and look for suds without restarting the appliance. Use only automatic dishwasher detergent in the quantity recommended for the model and water conditions. Do not add another chemical or an improvised foam remedy; follow the manufacturer's recovery instructions.

4. Look at visible hoses and connections

A water supply fitting, inlet hose or drain connection can leak, particularly after the appliance or nearby plumbing was moved. With power and water isolated, look only at safely accessible under-sink connections for moisture or damage. Do not tighten fittings blindly, disconnect lines or pull out the dishwasher. Tell the technician about any recent installation work and whether the leak occurs while the appliance is idle.

5. Leave overfill and internal seals for diagnosis

An inlet valve that does not close correctly, a water-level or float fault, or a leaking pump or sump seal can produce water beneath the appliance. Some models activate leak protection and run a drain pump when water reaches a base tray. Do not tilt the dishwasher to clear the warning or bypass a float. The source needs diagnosis before a seal, valve or pump is selected for replacement.

When professional diagnosis is appropriate

Request service for an active or recurring leak, damp cabinetry, a damaged seal, water beneath the unit or a leak-protection error. Keep power and water isolated where safe. A leak at household plumbing may require a plumber; an appliance leak needs assessment of its hoses, seals, valves and pump area. Waiting for a puddle to disappear does not establish that the fault is resolved.

For an appliance fault, learn about our dishwasher repair service, including diagnosis, documented work and booking options in Toronto and the GTA.

What to share when requesting service

Share the model, where and when water first appeared, any error code, the detergent used and whether plumbing or installation work occurred recently. Photos taken safely before cleanup can help explain the location.

Related guidance

• Dishwasher Not Draining? Causes & What to Check
• Dishwasher Not Cleaning Properly? Causes & Fixes