Dishwasher Drain Into Sink instead of Under?

1 Answer

Dishawasher floods

Two possible reasons come to my mind. First, and simplest, I've seen Dishwasher installations that did not use a air gap in the Dishwasher drain (usually a dome device mounted on the back of the kitchen sink or sometimes mounted in the wall just above the sink in older homes).When an air gap is not used, it is imperative that a high loop is formed in the dishwasher drain line, and tied up in that position (usually under the kitchen sink,as high as possible- the underside of the sink faucet usually works, or a screw into the bracing under the counter top to wrap a soft wire looped around the drain hose to hold it there permanently). If you do not use a air gap, or have a high loop in the dishwasher drain hose, then likely you are getting a back flow of dirty water into your dishwasher from the drain plumbing to which the dishwasher is connected (likely the garbage disposer or the tail from the sink basin.) So every time you either run the...

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Why does my dishwasher drains into my sink?

In most cases, dishwashers and sinks share a common drain. When a wash cycle ends, a pump pushes water from the dishwasher up and into the sink drain. This can take a variety of paths:

It can run to a ‘Tee’ in the drain pipe

It can run into the garbage disposal, if one is present

It can even be run into its own section of drain pipe

In some areas, code requires that an ‘air gap’ be installed, to separate the two systems

If the water from your dishwasher is entering your sink, it is most likely backing up from the drain. When the dishwasher drains, the water is pumped into the sink drain, and if the drain is backed up, the water will have nowhere to go but back up and into the sink. In that case, the answer is to clear out the drain so the water can flow smoothly.

On the other hand, if your area requires an air gap, and the gap is installed backward… you might have other issues


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A dishwasher consists of a hot water supply, electrical plug and a drain hose.

If you have installed a new dishwasher and have made the first two connections, you may be wondering how and where the drain hose connects. A dishwasher drain hose connects to the sink drain and requires a special drain pipe with an additional drain port. You can install the drain hose for your dishwasher by following a step-by-step procedure.

Step 1

Locate the straight drain pipe under the sink that connects the drain stub to the p-trap. The p-trap is the curved pipe.

Step 2

Loosen the large nuts on either side of the straight pipe using a pair of slip-joint pliers. Turn the nuts counterclockwise until they can be loosened completely by hand.

Step 3

Pull out the top of the p-trap from the bottom of the straight pipe and twist the p-trap slightly in either direction a few inches. You may need to loosen the nut on the other end of the p-trap that connects it to...

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A dishwasher that won't drain, is an annoying problem, simply because every time you open it, you find that a large amount of water is left behind at its bottom. Many of you must have faced this situation. You feel helpless as you have no clue why it is happening. You often defer such repair work of kitchen appliances on your own, in the fear that the situation may worsen further. However, actually, it is not so much of a major issue in most cases.


In this section, we are trying to figure out all the possible causes behind the problem. We are also providing you with some solution to fix each one of those problems:

Cause #1: The most common cause is clogging of the household drain under the kitchen sink. Observe the dishwasher carefully while it is draining. If you find that water bubbles are coming up into the sink, then it is likely that the problem lies in the drain pipe, and not the machine. Detach the pipe from the kitchen sink, and clear out all the...

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Dishwasher Drain How To Guide

Most residential dishwashers have the same hook up for the dishwasher drain and the water supply.

The standard dishwasher drain hose size is 5/8"(I.D.) inside diameter on both ends.

The drain, electric, and water connections are all located on the bottom of the dishwasher.

It is Recommended by the manufactures that you install the dishwasher water supply line to the hot water supply.

The water supply line for a dishwasher will have a 3/8" compression connection on both ends.

The dishwasher drain gets connected to either the garbage disposer(if you have one) or gets connected to a "dishwasher tee".

A dishwasher tee gets installed between the tail piece and the trap and creates the connection for the dishwasher drain.

To determine the length needed for the water supply line, drain hose, and the electric wire(for hard wiring direct) you would add three feet to the measurement. Measuring from the shut off...

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As part of the overall installation of a dishwasher, hooking up the drain is usually pretty easy, but there are a few things to consider before you do it. Take a look at the different methods of connecting a dishwasher drain, so you will know your options when installing a garbage disposal or a new dishwasher.

If you are replacing an existing one, it is usually easier to simply copy the same drain hookups that were used on the old dishwasher. If you are adding a dishwasher for the first time,... then you will need to install a special drain fitting to give the dishwasher a place to drain.

The following pages will show several different variations you may encounter, including:

Drain line connected through an air gap to garbage disposer.Drain line connected through an air gap directly to drain.Drain line configured in a "high loop" to garbage disposer.Drain line configured in a "high loop" directly to drain.

TIP: An air gap fitting is a safety device mounted on...

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@VideoJoeKnows - Troubleshooting a clogged dishwasher drain line

@dereton33 - How to fix water coming up through your sink from the washing/laundry machine/dishwasher.

@Appliance Princess - My Dishwasher is Draining into My Sink!

@ramonasplumber - The Diswasher Air gap - how to clean it and why it's important

@leksicon1 - Clogged Drain - How to unclog a clogged kitchen sink easy fix


@chasitygayle - Dishwasher to Garbage Disposal - NOT Draining

@FreedomToFix - Freeing a Dishwasher Drain Line

@Lydia Witter - Water settling in dishwasher.

@HomeShowRadio - Why does water backup on the disposal side of my sink

@Scott Makseyn - Is Your Dishwasher Drain Installed Properly?

@FortEllsworth - Water From Common Drain Backing Up In Kitchen Sink 05052013 021

@HomeAdvisor - How to Fix a Clogged...

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It’s not pleasant to discover that your dishwasher is not draining. A flooded kitchen is usually the first and worst symptom of draining problems. There are several possible causes, some of which can be easily fixed or avoided. In order to troubleshoot problems, you will need to know how your dishwasher’s motor operates. Direct drive motors continue in the same direction throughout all of the cycles. Forward-reversing motors stop and then spin in the opposite direction to help drain the water out of the dishwasher.

Why Won’t It Drain?

Many things, some simple and some complicated, can cause your dishwasher to have drainage problems. If your machine has a forward-reversing motor that is malfunctioning, that can cause the problem. This is one of the more complicated issues to resolve.

If the problem started shortly after installing a new garbage disposal, then the solution can be simple. For the disposal to operate, it’s necessary to remove what’s called the...

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Water failing to drain is one of the most common problems that people have with their dishwashers. It’s also an issue that’s easy to diagnose, with standing water in the basin being the obvious symptom.

There are several different reasons that this fault can arise, but fortunately in the majority of cases a simple blockage is the culprit – usually an easy fix that won’t require replacement parts or an engineer call-out.

If your dishwasher has detected a drainage problem it will stop the wash cycle which will prevent any flooding/leaking, and display an error code which might give you a clue as to the source of the fault.

You can find fault code definitions for your make/model of dishwasher by selecting a manufacturer from this list.

Is the Dishwasher Filter Blocked?

If your dishwasher isn’t draining properly then checking the filter in the sump should always be your first course of action – it’s the most common cause and the easiest to fix.

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Whether you’re putting in all new appliances or simply replacing a worn-out machine, installing a dishwasher yourself is a DIY project that’s not that difficult and can save you a hefty installation fee.

Preparations for Dishwasher Installation

The first step is making sure the machine will fit in the opening. Most standard dishwashers require a 24” opening. If you’re installing new cabinets, it’s important to consider the width of the dishwasher ahead of time. The height of most machines is adjustable within certain limits, but check to be sure the dishwasher you plan on purchasing will fit your opening before buying.

Depending on your cabinet configuration, you may need to drill one or more holes to run supply lines, electrical wiring, and the drainpipe through. Hole saws make quick work of drilling larger diameter holes.

Remove the faceplate at the base of the machine to access the supply line inlet and electrical box. It’s a...

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In some dishwasher machines it is easier pull the whole machine out from under the kitchen counter to get to the pump or the motor. Specifically: GE/Hotpoint, Thermador/Waste King, WCI/Westinghouse, and late model Whirlpool.

In yet other machines, the pump and motor can both be easily removed with the machine in place. Specifically: Whirlpool Vertical Machines, Maytag, ISE/Kitchenaid, D&M.

Note that D&M, Kitchenaid and Thermador pumps can easily be rebuilt with the machine in place, but getting the motor out can be a bit persnickety. Give it a try, but if you have trouble getting the motor out or back in, yank the machine.

Most dishwasher problems can be diagnosed and fixed with the machine in place. However, some problems cannot. In either case, you'll usually need to get to the components beneath the tub. This section describes cabinet access and removal of a built-in machine.

Most built-in models are built with removable kickplates as shown in Figure...

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Once you’ve used the kitchen sink to clean the dishes, or anything else for that matter, you may end up with the unfortunate side effect of a dirty kitchen drain. One would think a sink used for cleaning would basically clean itself, but on the contrary, it takes a bit of effort to keep the kitchen drain clear and odor free.

Before you can clean and deodorize your kitchen drain, you have to remove any food or other debris that is clogging it. If it’s just a minor clog, you can probably remove it by running the garbage disposal if you have one, or picking the food out of the drain with your hands if you don’t. (Be sure that the garbage disposal is turned off before sticking your fingers in the drain!) To find out how to deal with a more seriously clogged kitchen sink drain, see how to unclog a drain. To find out how to deodorize your drain, just keep reading.

Kitchen Drain Cleaning Instructions

1. Run hot water in the drain

The stinky scent in...

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Yes, there is a secret to installing a Bosch dishwasher. Let's get there together:

First, There is a very small amount of electrical wiring that needs to be done. If you're uncomfortable or unsure how to hook up household electrical components, you should call for help from someone who is experienced to show you how, at least the first time!

These are the steps to installing ANY dishwasher in an existing space, in other words replacing an existing dishwasher:

1) Turn off the electrical power to the dishwasher at the breaker box.

2) Turn of the hot water supply under the sink that goes to the dishwasher, and remove the hose from the supply. Make sure that the hose can freely move out through the hole in the cabinet so that it leaves with the old machine.

3) Locate the screws that are holding the dishwasher into the cabinet. In most cases there are 2 small screws up under the front of the counter, but sometimes they are screwed to the sides of the cabinet,...

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