How to Replace a Dishwasher

A dishwasher that’s past its prime may be inefficient in more ways than one. If it’s an old model, it probably wasn’t designed to be very efficient, to begin with.

But more significantly, if it no longer cleans effectively, you’re probably spending a lot of time and hot water pre-rinsing the dishes. This alone can consume more energy and water than a complete wash cycle on a newer machine.

So even if your old dishwasher still runs, replacing it with an efficient new model can be a good green upgrade. In terms of sizing and utility hookups, dishwashers are generally quite standard.

If your old machine is a built-in and your countertops and cabinets are standard sizes, most full-size dishwashers will fit right in. Of course, you should always measure the dimensions of the old unit before shopping for a new one to avoid an unpleasant surprise at installation time. Also,

Be sure to review the manufacturer’s instructions before starting any work.

On this post, I will share with you the maximum amount of experience that I have made through my Xjob, focus and keep reading.

What do I need to Replace a Dishwasher?

These are the tools that you must have before you start replacing your dishwasher: Screwdrivers, Adjustable wrench, 2-ft. level, 5⁄8″ automotive heater hose, automotive heater hose, 4″-length of 1⁄2″ copper tubing, Cable connector, Teflon tape, Hose clamps, Wire connectors, Carpet scrap, and Bowl.

How long does it take to replace a dishwasher?

Replacing an old, inefficient dishwasher is a straightforward project that usually takes just a few hours especially if the dishwasher was a standard one, it will take no more than 2 hours as maximum for removing existing to installing and testing a new dishwasher. The energy savings begin with the first load of dishes and continue with every load thereafter.

How much does it cost to replace a dishwasher?

When you are replacing an existing dishwasher, the installation will include minor adjustments to countertops, Plumbing, or wiring. Typical labor runs between 150$ to 475$, with most homeowners paying 300$. but the best thing is that you can replace it with yourself easily, and save 100% of the cost.

Steps to Replace a Dishwasher

1. Start by shutting off the electrical power to the dishwasher circuit at the service panel. Also, turn off the water supply at the shutoff valve, usually located directly under the floor.

2. Disconnect old plumbing connections. First, unscrew the front access panel. Once the access panel is removed, disconnect the water supply line from the L-fitting on the bottom of the unit.

This is usually a brass compression fitting, so just turning the compression nut counterclockwise with an adjustable wrench should do the trick. Use a bowl to catch any water that might leak out when the nut is removed.

3. Disconnect old wiring connections. The dishwasher has an integral electrical box at the front of the unit where the power cable is attached to the dishwasher’s fixture wires.

Take off the box cover and remove the wire connectors that join the wires together.

4. Disconnect the discharge hose, which is usually connected to the dishwasher port on the side of the garbage disposer. To remove it, just loosen the screw on the hose clamp and pull it off.

You may need to push this hose back through a hole in the cabinet wall and into the dishwasher compartment so it won’t get caught when you pull the dishwasher out.

5. Detach the unit from the cabinets before you pull it out. Remove the screws that hold the brackets to the underside of the countertop.

Then put a piece of cardboard or old carpet under the front legs to protect the floor from getting scratched, and pull the dishwasher out.

6. First, prepare the new dishwasher. Tip it on its back and attach the new L-fitting into the threaded port on the solenoid.

Apply some Teflon tape or pipe sealant to the fitting threads before tightening it in place to prevent possible leaks.

7. Prepare for the wiring connections. Like the old dishwasher, the new one will have an integral electrical box for making the wiring connections. To gain access to the box, just remove the box cover.

Then install a cable connector on the back of the box and bring the power cable from the service panel through this connector. Power should be shut off at the main service panel at all times.

8. Install a leveling leg at each of the four corners while the new dishwasher is still on its back. Just turn the legs into the threaded holes designed for them.

Leave about 1⁄2″ of each leg projecting from the bottom of the unit. These will have to be adjusted later to level the appliance. Tip the appliance up onto the feet and slide it into the opening. Check for level in both directions and adjust the feet as required.

9. Once the dishwasher is level, attach the brackets to the underside of the countertop to keep the appliance from moving. Then pull the discharge hose into the sink cabinet and install it so there’s a loop that is attached with a bracket to the underside of the countertop.

This loop prevents wastewater from flowing from the disposer back into the dishwasher. Note: Some codes require that you install an air gap fitting for this purpose. Check with your local plumbing inspector.

10. Push an adapter over the disposer’s discharge nipple and tighten it in place with a hose clamp. If you don’t have a disposer, replace one of the drain tailpieces with a dishwasher tailpiece, and clamp the discharge tube to its fitting.

11. Adjust the L‑fitting on the dishwasher’s water inlet valve until it points directly toward the water supply tubing. Then lubricate the threads slightly with a drop of dishwashing liquid and tighten the tubing’s compression nut onto the fitting. Keeping the brass bushing between the nut and the L-fitting.

Use an adjustable wrench and turn the nut clockwise.

12. Complete the electrical connections by clamping the cable and joining the wires with wire nuts, following manufacturer’s instructions.

Replace the electrical cover, usually by hooking it onto a couple of prongs and driving a screw. Restore power and water, and test. Replace the toe-kick.

Tube Choices, Note: Codes still allow copper supply tubes like the one shown, but a 4‑ to 5‑ft. flexible dishwasher supply tube is a better choice if you are likely to be sliding the appliance in and out. A copper tube is less likely to burst, so it may be preferable in cases where the appliance is unlikely to be moved.

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