How to disconnect & reconnect a dishwasher
First disconnect the water supply.
Ease the machine forwards so that you can reach the pipe work behind it. There should be one rubber hose connecting the cold water supply to the back of the machine. You need to find where this joins the pipe work – often under the kitchen sink.
The rubber hose will have a washing machine valve at the end of it, which has a blue lever. Turning the lever 90 degrees so that it points across the pipe (rather than along it) this will cut off the water supply. Then you can unscrew the blue nut and pull the hose free.
Please note it is easy to accidentally knock the valve lever on, so if you are leaving the machine permanently disconnected, it is better to buy a washing machine valve cap from a plumbers’ merchant to stop unwanted leaks.
Secondly, disconnect the waste water pipe work. Locate the other end of the ridged plastic hose running away from the back of the machine. If the other end plugs into the U-bend under the kitchen sink, you will need to pull this off and plug the U-Bend with a cap from a plumbers’ merchant. If it hooks into a vertical pipe leading to the drains, then you can simply pull out the hose.
How to connect a New Dishwasher
First connect the waste hose, which leads from the back of the machine to the drains. This either simply hooks into a vertical pipe, or needs to be pushed over a spigot on the U-bend under the kitchen sink. Be sure to use a jubilee clip to secure it.
Try to keep the drain hose as high up above the U bend, as possible. If possible use the half-round hose support and screw it to the back or side of the cupboard / wall. This is to prevent any kitchen sink water leaking back into the dishwasher.
Secondly, connect up the water supply to the cold washing machine valve. Once these are firmly attached, turn blue lever on the valve 90 degrees so that it points along the pipe rather than across it. This is to turn the water supply on.
Check for leaks before pushing the machine into position.