If you’re tired of washing dishes by hand or having to wait for a friend to finish their dishwasher, installing your own can be an easy and relatively inexpensive upgrade. However, Dishwasher installation is a project that requires special attention to detail to ensure the electrical, water supply and drain hose connections are properly made. If you’re not confident in your ability to make these connections yourself, contact a plumbing specialist.
Before attempting to connect your new dishwasher, shut off the power at the circuit breaker and turn off the water supply using the valve under the sink. Next, disconnect the old dishwasher. Use a screwdriver to remove the screws that anchor the toe panel and left and right cabinets, then unscrew the leveling legs from each corner of the base. Place a towel or piece of cardboard in front of the dishwasher to prevent drips and carefully pull the appliance out of the cabinet opening.
Depending on your model, you may be connecting to a dedicated GFCI-protected 120V power outlet, hardwired through an NM circuit cable into the dishwasher’s wire connection box or connected to a standard wall outlet via a plug-in connector. Dishwashers also have a water inlet and a drain hose that connect to either your sink’s tail pipe or your garbage disposal. Before beginning any work, read your dishwasher’s manual for specific instructions.
Open the dishwasher box and remove any shipping materials, including the cardboard that covers the back of the unit and styrofoam pieces used to protect the interior during shipment. Obtain help from a friend and carefully tilt the appliance on its back to make the rear access panel and electrical connections more accessible.
Remove the kickplate from the base of the dishwasher and locate the junction box, which is a square metal box with three colored wires inside. Unscrew the cover, then feed the exposed end of the power cord through the round opening in the box (Image 1). Connect the wires to the terminal connectors, following the dishwasher’s manual for specific instructions.
Locate the dishwasher’s water inlet, which is typically a threaded hole that will accept water line adapters, a male- or female-threaded fitting that needs to be installed on the faucet end of the water supply tube or a 90-degree elbow that can be purchased separately and attached at the water inlet on your dishwasher. If you’re connecting the dishwasher to a faucet, install the female end of the adapter on the faucet first, then thread the hose onto the inlet.
If the dishwasher has a drain hose, attach it to the drain port, then route it through the bottom of the unit and underneath the rear legs, which should be removed as well. Connect the hose to your drain pipe and run a full cycle to ensure all connections are tight and secure. When the cycle is complete, shut off the power and water supply and disconnect the hose.
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