I have a newly installed Kitchenaide dishwasher. The copper pipe is secure under the sink and appears connected properly to the dishwasher. When I turn the shut off valve on, water begans to run from underneath the dishwasher. There is no water under the sink. The plastic hose does not seem to be the problem.

Go to the hardware store and buy a "Fridge Ice maker connection kit". It will come with copper tubing and fittings you will need to hook it up. You will also need a "T" fitting to connect it to your water line at the sink.

It all depends on what material your water line is made of and where you want to shut the water off at.

Under the dishwasher there is a threaded connection from the water line to the dishwasher and there is typically no isolation valve located there. You will have to follow the supply line back to where it ties in, typically it is feed from the kitchen sink water supply. Hopefully the plumber who installed the lines provided a local shut off valve under the sink, otherwise you will have to shut the water off at the main house supply.

Here is a couple of ways to cap the line off.

Copper - You can get a cap and solder it on, make sure there is no water in the line because it will not heat up enough for the solder to penetrate the joint. Use flux and lead free solder on the copper lines. When you are ready to replace, just turn the water off, cut the cap off, and install the necessary fittings to connect the dishwasher. If I was going to do this, I would install a valve and a braided stainless steel line for the dishwasher. This makes it a snap to reinstall. Any hardware store can supply these parts.

Plastic (PVC/CPCV) - same as above but use the proper cement rated for the type of plastic pipe.

PEX - You can buy a plug and a clamp ring, but you will need the proper crimping tool.

If you have a threaded connection, just go to the hardware store and buy a threaded cap.

If you need specific information, please update your question with more details, because I am just speculating what you have.

Connect your dishwasher's drainpipe to the discharge pump. Many local building codes require dishwashers to be vented using an air gap to prevent the siphoning of water from the sink drain or disposal. Mount the air gap in one of the sink holes or drill a hole for it in the countertop. Connect the drainpipes to the air gap and secure them with hose or spring clamps.

The following links will help you with your dishwasher's installation:

http://www.thisoldhouse.com/toh/video/0,,1630952,00.html

http://www.thisoldhouse.com/toh/how-to/intro/0,,20076102,00.html

Please remember to rate this solution. Thanks!

Check your disposal. If newly installed the knock out plug was not removed. The smell could be food decaying. No water should be coming out of the vent on the sink.

Remove the rubber pipe from the dishwasher to the disposal.
Stick a screwdriver into the hole and look down the disposal from the top and see if you are able to see the screwdriver.
If not get a hammer and pop the plug out and reach in the disposal with your hand and retrieve the plug after you have unplugged the electrical cord.
Once the plug is out re-install the rubber pipe and secure it plug in your electrical cord and try your dishwasher again. Good Luck

well I had a plumber connect a new hose it cost me $ 85 but it was properly install, since we added a splitter Home depot recommended but it can't take the pressure and the hose connector will leek. or if you are handy connect a splitter and a new valve

Its normal to have the water supply from under sink to dishwasher 3/8 soft copper. If there is a water stop under sink for dishwasher go ahead and shut it off. If not you will have to shut water off at main. Now you can unscrew supply at dishwasher, it's close to the front on left side. Its a 3/8 compression nut, you can use a small cresent wrench.

Usually the sink connection is not an overflow, it is the main drain from the dishwasher. It is more likely your s-bend is blocked under the sink- try putting a bucket under it and unscrewing the u-shaped piece and cleaning out (remember don't wash it in that sink while the pipe is off)

Check the hose first - it could be split or damaged esprcially if it's old. Check all the clamps to be sure they are tight. Chack all connections to the dishwasher and drain spur under the sink. Check the drain trap fro any leaks.

these vibration in water pipes or cooper lines come from air in thewater supply system..dont take your appliances apart...

To get the water to the dishwasher, it depends on your plumbing setup. If you have shutoffs under your sink(1/2" X 3/8" compression angle stop), you will need to buy a 1/2" x 3/8" compression double stop. This will be easy to change.

#1 Drill a 1 1/2" hole in the back bottom of the cabinet to run your water, drain line, and power cord through.
#2 First turn off the water at the Hot Water Tank, or the House supply, and turn on the sink to relieve the pressure.
#3 Next remove the Hot supply stop, and install the double stop.( The nut and ferrul do not have to be removed, as they will attach to the double stop. Reinstall the hot supply to the sink to one of the connections on the double stop.
#4 Install a 3/8" x 3/8" x 48" braided flex with the 1/2" MIP
x 3/8" compression ell at the dishwasher.
#5 Install the drain hose supplied with your dishwasher at the bottom of the dishwasher.
#6 Install a 6' pigtail power cord to the power box under your dishwasher.
#7 Feed the drain line, power cord and water supply through the hole in the back of the cabinet at the bottom. As you push the dishwasher back into the enclosure, you will need to feed the 3 lines into the cabinet under the sink.
#8 Attach the water line to the open connection on the double stop.
#9 The drain line will attach to your garbage disposal.(If you have one) Be sure to knock the small piece of plastic out of the drain connection, and retrieve it out of the disposal, before connecting the dishwasher drain line.
#11 Raise the middle of the drain line as high as possible under the cabinet under the sink, preferably attach it to a screw to the bottom of the counter top. This will keep the dishwasher from drawing a back siphonage and getting a bad odor.
#12 Plug in the dishwasher. Assuming you have electrical under your sink. Otherwise an electrical outlet may need to be installed.
#13 Balance the dishwasher using the front legs. After you adjust the depth of the dishwasher, and the level. Use the 2 mounting screws included with the dishwasher to fasten the 2 clips above the door to the bottom of the counter top.
#14 Remove the installation manual and styrofoam from the tray, and turn the dishwasher on. Inspect for leaks as you run a cycle.
#15 Attach the bottom kick panels

You are done.

If you have any questions, please let me know.