How to Replace the Diverter Valve in Your Dishwasher

When one dishwasher rack comes out clean while the other is still covered in food, the problem may be with the diverter valve. This small component directs water between the upper and lower spray arms, helping each rack get the water pressure it needs during the wash cycle. If the valve sticks or fails, water may stay directed to one set of spray arms, leaving the other rack barely washed.

Replacing a failed diverter valve is a manageable DIY repair that usually takes about 30 to 45 minutes. You don’t need specialized skills or expensive tools, just some patience and a little room to work. Here’s how to replace it from start to finish.

Full safety notes below

What the Diverter Valve Does and Why It Matters

Inside your dishwasher, there’s a single wash pump pushing water through the system. But your dishwasher has multiple spray arms, typically one on the bottom, one in the middle, and sometimes one at the top. The diverter valve is the traffic cop that directs water flow between those spray arms at different points during the wash cycle.

When the control board sends a signal, the diverter valve rotates or shifts internally to redirect water pressure from one spray zone to another. That’s how your dishwasher manages to clean every rack evenly throughout the cycle. Without it working properly, the pump still runs, water still flows, but it only reaches part of the interior. The result is dishes that are half-clean at best.

Signs Your Diverter Valve Has Failed

A bad diverter valve doesn’t usually announce itself with error codes or loud noises. The symptoms are more subtle, and that’s what makes it easy to overlook. Here’s what to watch for:

• The top rack dishes come out dirty while the bottom rack is clean, or vice versa

• One spray arm spins weakly or not at all

• You hear the dishwasher running normally but wash results have gotten progressively worse

• Water pressure seems lower than it used to be, even though nothing else has changed

• Food particles are left on dishes that used to come out spotless

If your dishwasher used to clean beautifully and has slowly declined in performance (especially with uneven results between racks), the diverter valve should be your first suspect. A clogged filter or worn wash impeller can cause similar symptoms, so check those too. But in our experience, the diverter valve is the culprit more often than people expect.

Tools You’ll Need

Keep it simple. Here’s what to have on hand:

• Torx or Phillips-head screwdriver (varies by brand and model)

• Flat-head screwdriver or trim removal tool

• Towels

• Small bowl or container for screws

• Pliers (needle-nose if possible)

Some diverter valves are accessed from inside the tub, while others require you to tip the dishwasher and work from underneath. Your model dictates the approach. If you’re working with a GE dishwasher, we have a detailed walkthrough on how to replace the diverter valve assembly on a GE model that’s worth checking out.

Before you do anything, kill the power. Either unplug the dishwasher or flip the breaker. Also, turn off the water supply at the shut-off valve under the sink. You’ll likely encounter a small amount of standing water inside the unit, so have those towels handy.

Step-by-Step: Replacing the Diverter Valve

The exact procedure varies by manufacturer, but the general process follows the same logic across most major brands. Here’s how we approach it.

1. Remove the lower dish rack and spray arm. Pull the rack out and set it aside. The lower spray arm usually lifts straight off or unscrews by turning it counterclockwise. Some models have a retaining nut or clip. Just look underneath the arm before pulling.

2. Remove the spray arm support or sump cover. Depending on your model, the diverter valve sits beneath the spray arm assembly or inside the sump area at the bottom of the tub. You’ll typically need to remove a few Torx or Phillips screws to access the cover plate. Keep those screws organized: they’re small and easy to lose down the drain.

3. Locate the diverter valve. Once the cover is off, you’ll see the diverter motor and valve mechanism. It’s usually a small motor attached to a rotating disc or shuttle that directs water flow. Take a quick photo with your phone before disconnecting anything. That reference will save you time during reassembly.

4. Disconnect the wiring harness. There will be an electrical connector running to the diverter motor. Press the locking tab and pull the connector straight off. Don’t yank on the wires themselves. Grip the connector housing.

5. Remove the diverter valve assembly. It’s typically held in place by screws, clips, or a combination of both. Some models use a quarter-turn locking mechanism. Gently work the valve out of its seat. If it feels stuck, check for a rubber seal or O-ring that might be gripping; a slight twist usually frees it.

6. Inspect the mounting area. With the old valve out, take a moment to clean the area around the seal surface. Mineral buildup and debris can prevent the new valve from seating properly. A damp cloth works fine here.

7. Install the new diverter valve. Seat the new valve into the mounting area, making sure any alignment tabs or notches line up correctly. If there’s an O-ring or gasket included with your replacement part, make sure it’s positioned before you lock everything down. Hand-tighten screws first to make sure nothing is cross-threaded, then snug them up.

8. Reconnect the wiring harness. Push the connector onto the diverter motor terminals until you hear or feel the locking tab click into place.

9. Reinstall the sump cover, spray arm support, and lower spray arm. Reverse the order you used during disassembly. Make sure the spray arm spins freely once it’s back on: if it’s binding, something underneath isn’t seated correctly.

10. Replace the lower rack, restore water and power, and run a test cycle.

Here’s what catches most people off guard: the orientation of the valve during installation. If the diverter is rotated even slightly off its correct position, the water distribution will still be wrong even with a brand-new part. Match the alignment exactly to what you saw in your reference photo.

Testing the Repair

Run a normal wash cycle with the dishwasher empty. Open the door mid-cycle at different points to check whether both spray arms are getting water. You should be able to see water actively spraying from each arm at different stages of the cycle.

After the cycle completes, check the inside of the tub. Water distribution marks should be relatively even across both the upper and lower zones. Then run a full load of dirty dishes and see how things come out. You should notice an immediate difference compared to the uneven results you were getting before.

If one rack is still underperforming, double-check that the valve is oriented correctly and the wiring harness is firmly connected. A loose connection can cause the diverter motor to fail intermittently, which mimics a bad valve.

Need More Help?

Every dishwasher model handles the diverter valve a little differently. If you’re running into something unexpected or need help identifying the right part, head over to our community repair forum where real techs can walk you through your specific situation.

When you’re ready to order, grab your model number and find the exact diverter valve for your dishwasher. That model number is everything: it ensures you get the right part the first time so you’re not making a second trip.

Written by: AppliancePartsPros Team