Installing a new dishwasher is a simple task, but it requires work with water, waste and electrical systems. To avoid the risks of electrical shock and flooding, the first step you should take is to turn off the electrical and water supplies to your kitchen. While the job requires few tools, careful installation of a worktop dishwasher is essential to prevent damage to the new machine. Before installing any worktop dishwasher yourself, always read the manufacturer's installation instructions.
Shut off water and electricity to the kitchen.
Open the bottom panel of the old dishwasher and unhook the dishwasher's supply line, drain hose and electrical line. The supply line and drain hose should be easy to see under the dishwasher. The electrical line will run to an electrical socket, often near or under the sink.
Remove the screws holding the unit into place. The screws typically are found at the top of the open dishwasher, and attach the machine to the worktop. Once the screws are removed, remove the old dishwasher from under the worktop.
Remove the bottom cover plate from the new dishwasher. Carefully slide the dishwasher into the opening under the worktop. Be careful not to damage any of the supply lines as you move the new machine.
Attach the dishwasher's supply lines to the drain and water lines under the worktop. The lines will attach with compression nuts. Tighten them with an adjustable spanner.
Adjust the levelling legs beneath the machine, and verify that the dishwasher is level with a levelling tool.
Use screws to secure the dishwasher into position under the worktop.
Turn on the water and electricity and do a test run with the bottom panel open, checking for leaks or sparks.
Reinstall the bottom panel if there are no signs of leaks or sparks.