In this video, This Old House plumbing and heating expert Richard Trethewey explains how to replace a dishwasher.
1 Turn off the electricity to the dishwasher at the main electrical panel.
2 Remove the access panel from the lower front of the dishwasher and disconnect the electrical wiring.
3 Turn off the water to the dishwasher at the shut-off valve.
4 Disconnect the copper water-supply line from the dishwasher; drain excess water from the line into a shallow pan.
5 Disconnect the drain line from the dishwasher.
6 Open the dishwasher and back out the screws holding it to the underside of the counter.
7 Slide out the old dishwasher.
8 Drill 1-inch hole through cabinet; feed soft copper tubing through hole into sink cabinet.
9 Use adjustable wrench to attach copper tubing to hot-water shut-off valve inside sink cabinet.
10 Disconnect old drain line from the garbage disposer.
11 Tape hot-water line and electrical cable to floor; slide new dishwasher into place.
12 Bend the copper line using a tubing bender.
13 Cut tubing to length and attach it to the dishwasher with a compression fitting.
14 Secure electrical wiring with twist-on wire connectors.
15 Use stainless-steel hose clamp to connect new drain hose to side of garbage disposer.
16 Screw dishwasher to underside of countertop.