Standing Water in the Dishwasher: Start With the Cheap Causes

You open the dishwasher expecting clean dishes and find an inch of grey water sitting in the bottom. Or the dishes are clean but the water never went anywhere.

This is the appliance complaint where people most often assume the worst. It is also the one where the cause is most often something small, cheap and reachable in ten minutes. Worth working through in order before anyone quotes you for a pump.

Start with the filter

Most modern dishwashers have a removable filter in the floor of the tub, usually a cylinder you twist out. A great many people do not know it exists, and it is designed to be cleaned.

When it packs with food, grease and label paper, water cannot get to the pump. You get standing water, poor cleaning, or a smell — sometimes all three. Pull it out, rinse it under the tap, put it back. If that fixes it, you are done.

Then the garbage disposal

This one catches people constantly, and it is worth knowing about because it is not intuitive.

Your dishwasher usually drains through the garbage disposal. If the disposal is clogged, the dishwasher cannot empty — the machine is fine, the exit is blocked. Run the disposal and try again.

And if a disposal was fitted recently: there is a knockout plug inside the inlet that has to be removed before a dishwasher can drain through it. If your dishwasher stopped draining right after new plumbing work, that plug is the first thing to check. Whirlpool covers this and the rest of the sequence in their own not-draining guide.

Then the drain hose

The hose should rise in a loop before it drops to the drain connection. That loop stops dirty sink water siphoning back into the machine. If it has been knocked flat — usually by something stored under the sink — drainage suffers and the dishwasher can refill itself with the water it just expelled.

Kinks do the same thing, and they are easy to create when a machine is pushed back into its cabinet.

When it really is the pump

If the filter is clean, the disposal is clear and the hose is fine, then the drain pump becomes the likely candidate. Typical signs:

• A humming or grinding noise at the point in the cycle where it should be draining
• No drain noise at all when there plainly should be
• Water clearing very slowly, or only partially
• The cycle stopping partway through

Small hard objects are a common culprit — a fruit stone, a chip of glass, a screw. Sometimes the pump is fine and simply jammed.

Dirty dishes is a different fault

Worth separating, because the two get conflated. Water not leaving is a drain problem. Water not cleaning is a circulation problem — the pump that drives the spray arms, or the spray arms themselves being blocked.

Spin the spray arms by hand. If they will not turn freely, or the holes are furred up with scale, that is your answer. Which brings up the local factor.

Hard water is doing this to you slowly

Water around here commonly tests between 7 and 11 grains per gallon. On the Water Quality Association scale that is hard to very hard, and scale steadily blocks spray arm holes, coats the heating element and shortens the life of seals and valves.

It is the quiet reason dishwashers in this area do not last as long as they should. A whole-house filtration system addresses it for every water-fed appliance at once, and we test your water before recommending anything.

Habits that prevent most of this

Scrape plates — you do not need to rinse them, but get the solid food off. Clean the filter monthly. Run the hot tap at the sink before starting a cycle so the machine begins with hot water. And do not pack it so tightly that water cannot reach the back of everything.

Where this comes from

• Whirlpool — dishwasher not draining
• Water Quality Association — water hardness scale
• ENERGY STAR — certified appliance list

If you would rather not deal with it

If you have worked through the filter, the disposal and the hose and it is still holding water, that is the point where it is worth a call. We cover Fayetteville, Hope Mills, Spring Lake, Raeford, Dunn, Wade, Cameron, Parkton and the rest of Cumberland, Harnett and Hoke counties.

Call or text 910-748-8423, or send us the details and we will call you back. We are a family business and we answer our own phone.