The reason it's hard to nail down how long this remodeling task will take is that usually it can't be known in advance exactly how the broken or outdated existing unit is configured or how many return trips to the home improvement store will be required.
Plumbing standards have changed over time and the current trend is to purchase and install Energy Star appliances. In many cases, the combination of reduced operating costs and the federal energy tax credit is enough to justify replacing a still-functional dishwasher. Although the details vary by appliance manufacturer and model, this article addresses the basic steps.
Remove the Old Dishwasher
The first thing to do is isolate power to the appliance by tripping the circuit breaker or removing the fuse in older homes. Next, remove the bottom front access panel on the appliance. On most models it is secured with a pair of screws or it may be held in place with friction clips.
The wiring connection is usually hidden behind an electrical cover plate; remove it. Use an electrical testing probe or an analog or digital multimeter to ensure that no electricity is reaching the unit. There should be two color-coded wires (black and white) and a ground wire. Disconnect the supply wires from the dishwasher side wires.
The next step is to disconnect the water supply line. This should be connected to a shut-off valve under the kitchen sink. Close the valve and remove the supply line with a pair of slip-joint pliers. Have a bucket and towel handy to catch residual water. Next, disconnect the supply line at the dishwasher.
Disconnect the appliance drain line at the garbage disposal or the sink drain line and then at the washer end. There will be a couple of screws securing the unit to the underside of the kitchen counter. Remove these and carefully slide the old unit out.
Install the New Dishwasher
Basically, installation is the reverse of the removal just completed, in addition to leveling the new one. Details on the leveling procedure will be included with the new unit but is commonly done by tweaking a pair of screw adjustments at the base.
It's best to purchase a new dishwasher installation kit which consists of a flexible braided supply line with 3/8” fittings as well as a 90 degree elbow that attaches to the appliance. Connect metal fittings using Teflon tape.
Show-stopping issues can arise. For example, if the old supply line was copper, the new 3/8” fitting will likely not make up at all, but even if it does, leaking is inevitable. It will be necessary to turn off the main water supply to the home and replace the valve with a new one. It's an inexpensive fix but requires more work and an additional trip to the home improvement store.
Kelly Smith - Kelly has over 30 years experience as a journeyman carpenter and 20 as a freelance writer and photographer.
Join the Conversation