Whether you are replacing the unit, refinishing the floor underneath, or selling the appliance, knowing how to disconnect a dishwasher properly takes about 45 minutes and three basic tools. Done wrong, the result is a flooded kitchen and a tripped breaker. Done right, the unit slides out clean and dry, ready to be carted off or set aside while you work.
- Tools and Materials You Will Need
- Step 1: Shut Off Power at the Breaker
- Step 2: Shut Off the Water Supply
- Step 3: Run a Quick Drain Cycle
- Step 4: Remove the Toe Kick and Access Panel
- Step 5: Disconnect the Electrical Wiring
- Step 6: Disconnect the Water Supply Line
- Step 7: Disconnect the Drain Hose
- Step 8: Remove the Mounting Brackets
- Step 9: Adjust the Leveling Feet and Slide Out
- Cap the Plumbing and Electrical
- Disposal and Reinstallation Notes
Tools and Materials You Will Need
Pull these together before you start so you do not have to stop mid-project with water dripping out of a hose.
- Adjustable wrench or 7/8-inch open-end wrench
- Phillips and flathead screwdrivers
- Channel-lock pliers
- Old towels (at least 4 to 6) and a shallow baking pan or paint tray
- Flashlight or headlamp
- Bucket (1 to 2 gallon)
- Voltage tester (a non-contact tester from Klein or Fluke runs $15 to $25)
Step 1: Shut Off Power at the Breaker
Locate your electrical panel and find the breaker labeled DISHWASHER or KITCHEN APPLIANCES. Switch it to OFF. If breakers are not labeled, look for a 15-amp single-pole breaker on the kitchen circuit. When in doubt, turn off the main breaker. The dishwasher draws 120V power, and even a brief contact with a hot wire while you are working in cramped quarters is dangerous.
Confirm the power is off by running the dishwasher briefly before you cut the breaker; the lights and motor should die. After flipping the breaker, hold a non-contact voltage tester near the wires inside the junction box (covered in step 4) to verify there is no current.
Step 2: Shut Off the Water Supply
The water supply valve is usually under the kitchen sink. Look for a small saddle valve or quarter-turn ball valve on the hot water line that branches off to the dishwasher. Turn the handle perpendicular to the pipe to close it. Some older homes do not have a dedicated dishwasher shutoff, in which case you need to close the main water shutoff for the house.
If the saddle valve is corroded or stuck, do not force it. Snapped saddle valves are a common cause of expensive water damage. Plan to replace it with a quarter-turn valve (about $12) once the dishwasher is out, and use the main shutoff in the meantime.
Step 3: Run a Quick Drain Cycle
Set the dishwasher to a drain or rinse cycle to clear standing water from the sump and drain hose. This takes about 90 seconds and saves you from a sloppy mess when you disconnect the drain line. After the pump stops, unplug or shut off the breaker again if you turned power back on for the drain cycle.
Step 4: Remove the Toe Kick and Access Panel
Look at the bottom front of the dishwasher. There is a metal or plastic toe-kick panel, usually held by 2 to 4 screws. Remove the screws and pull the panel off. Behind it you will find the junction box (electrical), the water inlet, and the drain hose connection.
Some models have insulation hanging in this area. Pull it gently aside or fully remove it to access the connections. Set the insulation in a clean spot so you can put it back when you reinstall a new unit.
Step 5: Disconnect the Electrical Wiring
The junction box is a small metal enclosure on the bottom front of the dishwasher. Remove the cover plate (one screw). Inside you will find three wires: black (hot), white (neutral), and bare or green (ground). They are typically joined to the dishwasher leads with wire nuts.
Unscrew the wire nuts and separate the wires. Loosen the cable clamp on the back of the junction box and pull the supply cable free. Cap the wires individually with wire nuts as you remove them so nothing shorts during transport. Take a quick photo of the connections before disassembling, it speeds up the reinstall on the new unit.
Step 6: Disconnect the Water Supply Line
The water supply enters through a 90-degree fitting on the bottom front of the dishwasher. Place a small shallow pan or fold a towel under the connection. Use the adjustable wrench to loosen the compression nut and unscrew it by hand the rest of the way.
A small amount of water will dribble out (residual in the line). If a steady stream comes out, you did not fully close the supply valve. Tighten the connection back down, fix the valve, and try again. With the line free, gently bend it out of the way.
Step 7: Disconnect the Drain Hose
The drain hose runs from the dishwasher up to either an air gap on the countertop, a high loop under the sink, or directly to the garbage disposal inlet. Trace the hose to its termination point and use channel-lock pliers to loosen the spring clamp or hose clamp.
Hold the bucket below the connection as you pull the hose free. Even after a drain cycle, several ounces of water remain in the hose and air gap. Once disconnected at the top, lower the hose into the bucket and let it drain completely. Then pull the hose down through the cabinet hole and feed it back into the dishwasher area.
Step 8: Remove the Mounting Brackets
Open the dishwasher door and look at the top edge. Most units are secured to the underside of the countertop with two small mounting brackets, one on each side, held by short screws. Remove the screws and let the brackets pivot free.
Some dishwashers (especially Bosch and other European brands) mount to the side cabinets instead. Look for screws in the side panels at the top. Granite or quartz countertops cannot be drilled into, so these installations always use side mounts.
Step 9: Adjust the Leveling Feet and Slide Out
The leveling feet on the bottom corners need to come down so the unit clears the counter overhang. Use a wrench or screwdriver (depending on the foot design) to lower each foot until the dishwasher drops about half an inch. Then walk the dishwasher forward by alternating sides, pulling out 2 to 3 inches at a time.
Watch the wires and hoses as the unit comes out. They should already be free, but they can snag on the cabinet opening. Once the dishwasher is fully clear of the cabinets, you can slide it onto a moving dolly or out into the room.
Cap the Plumbing and Electrical
If you are not installing a new dishwasher right away, cap the open lines so nothing leaks or shorts. Put a brass cap on the water supply valve. Stuff the drain hose location with a rubber test plug or seal it shut with a clamp. Wire-nut the electrical leads individually and tape the cable so it cannot come loose. Turn the breaker and water supply back on.
Disposal and Reinstallation Notes
Most municipalities accept dishwashers as scrap metal at recycling centers, sometimes for free. Big-box stores will typically haul away the old unit when delivering a new one (usually for a $25 to $50 fee). Reinstallation reverses these steps. Wrap fresh Teflon tape on the water supply threads and replace the rubber washer in the inlet fitting if it looks compressed or cracked.
