Dishwasher Diverter Valve Replacement: Steps

What the diverter valve does

The diverter valve is the component that routes water to the different spray arms inside the dishwasher. When the wash cycle moves from the lower arm to the upper arm or to a spray tower, the control board signals the diverter to shift water flow. A motor or solenoid inside the valve rotates or opens a passage, directing pressurized water where it is needed.

This part sits under the tub, usually near the circulation pump or the sump. It is separate from the inlet valve, which only lets water into the machine. If the diverter fails, water still enters the dishwasher but may only reach one spray arm or none at all. For more on the pump that recirculates water, see the recirculation pump guide.

Signs of a failing diverter valve

The most common symptom is that one spray arm stops spinning while others work normally. You may also notice that dishes in the upper rack stay dry while the lower rack gets clean, or the reverse. Some dishwashers make a clicking or buzzing sound when the valve tries to shift but cannot move.

Other signs include water pooling under the dishwasher after a cycle, or error codes related to the circulation system. If the valve is stuck in one position, the wash cycle may still run but cleaning results will be uneven. Check the spray arm holes and filters first, because blockages cause the same symptoms as a bad valve. Learn how to clean the spray arm in this guide.

Before you replace: test first

A new valve will not fix a problem caused by a clogged spray arm or a blocked sump. Remove the lower spray arm and inspect every hole. Clean the filters at the bottom of the tub and clear any debris from the sump area. Refer to our guide on dishwasher filter cleaning for the full process.

Check the wiring harness that connects to the valve. A loose or corroded connector can stop the valve from receiving power. If you have a multimeter, test the valve for continuity and check whether voltage reaches the connector during a cycle. You can also listen for a faint click when the cycle should switch from one spray arm to another. If you hear no click and power is present, the valve is likely faulty.

If the spray arms spin evenly during a short cycle but the wash result is poor, the valve may be fine and the issue could be related to wash pressure or circulation. A failed circulation pump can also limit water flow. If you suspect the pump, check for blockages or wear.

Step by step replacement

Safety comes first. Disconnect the dishwasher from its power source by unplugging it or turning off the circuit breaker. Shut off the water supply valve under the sink. Wait a few minutes for any residual water to settle before opening the sump area.

Remove the lower spray arm by unscrewing or unclipping it. Take out the lower rack if it is in the way. Remove the filter assembly and any bottom cover or access panel that protects the sump. Keep screws and clips organized so reassembly is straightforward.

Locate the diverter valve near the circulation pump. It is a plastic housing with a wire connector and a water passage. Disconnect the wire harness. Some valves are held by screws, others by twist locks or clips. Release the mounting hardware and pull the valve out carefully. Note the orientation of the seal and any alignment tabs before removing the part.

Install the new valve in the same orientation. Replace any rubber gasket or O-ring that came with the new part. Push the valve into place until it seats fully, then secure the clips or screws. Reconnect the wire harness and make sure the locking tab clicks. Reinstall the filter assembly, lower spray arm, and the access panel.

Open the water supply valve and restore power. Run a short wash cycle with the dishwasher empty. Watch through the door or listen for each spray arm to rotate. Confirm that water reaches both the upper and lower racks. If the valve shifts correctly, the cycle should complete without error codes.

Common mistakes to avoid

Do not force the valve into place if it does not align. If the part has a locating tab, the wrong position can damage the housing or cause a leak. Check that the wire connector is fully seated; a loose connector may work intermittently.

Do not reuse a brittle or cracked mounting bracket. When disassembling, if the bracket breaks, replace it at the same time to prevent vibration noise and poor sealing.

Do not forget to check the wire harness for damage. If wires are frayed or the insulation is melted, a new valve will fail again. Repair the harness before installing the new part.

Also verify that the new valve is the correct type for your model. Some valves operate on line voltage, others on low voltage. Installing a mismatched part can damage the control board. When in doubt, compare the part number to the original before installation.

Prevent future diverter failures

Hard water deposits can cause the valve to stick over time. Keep the wash water properly conditioned. If you have very hard water, read about dishwasher water softener settings and consider using a water softener if the machine has a built-in unit.

Clean the filter regularly and avoid heavy food debris entering the sump. Small bones, seeds, and sticker labels can obstruct the valve passage. Fine mesh filters catch most particles, but a clogged filter can still reduce water flow. Follow the steps in the dishwasher filter cleaning guide.

Run a periodic maintenance cycle with a dishwasher cleaner or citric acid to dissolve scale. Keeping the spray arms free of mineral deposits is also important. For more tips, see how to descale a dishwasher with citric acid and how to clean dishwasher spray arm inlet screens.

Should you repair or replace?

Replacing a diverter valve is an advanced repair. If you are comfortable disassembling the lower tub area and working with electrical connectors, it is a manageable job. But if the dishwasher is more than about ten years old, consider whether the machine is otherwise reliable before investing in a new valve. A failing circulation pump, worn spray arm bearings, or a leaking tub may make replacement the better long-term choice.

Compare the condition of the wash system. If the only issue is the valve, repair can extend the life of the dishwasher for years. If other parts show significant wear, or you notice rust in the tub, read the repair vs replace decision. If you decide to buy a new dishwasher, review the best built-in dishwashers or the best countertop dishwashers if you are limited on space.

A new dishwasher will also meet current efficiency standards. ENERGY STAR certified models are independently certified to strict efficiency levels, and their key criteria limit yearly energy use and water consumption per cycle. For more on reading the label, see the EnergyGuide label guide.

What to pick for your use

Questions

Where is the diverter valve located?

The diverter valve sits under the tub, near the circulation pump or sump. You reach it by removing the lower spray arm, filter assembly, and an access panel on the bottom of the tub.

How is the diverter valve different from the inlet valve?

The inlet valve lets water into the machine from the water supply. The diverter valve routes water that is already inside the machine to the correct spray arm. If the inlet valve fails, the dishwasher may not fill. If the diverter fails, the water may only reach one spray arm. See the inlet valve guide for more.

Can I test the diverter valve before replacing it?

Yes. Check for power at the wire connector during a cycle, listen for a clicking sound when the cycle should shift, and use a multimeter to test continuity. Also remove the spray arms and check for clogs, because blocked arms can cause the same symptoms as a failed valve.

Why does the lower spray arm spin but the upper arm does not?

That pattern often points to the diverter valve not shifting water to the upper arm. But first check the upper spray arm holes for clogs and confirm that the filter and sump are clean. If those are fine, the valve is the likely cause.

Do I need to turn off the water supply for this repair?

Yes. Always close the water supply valve under the sink before opening the sump. Residual water in the tub may spill, but the supply line must not pressurize the machine during disassembly.

Is replacing the diverter valve covered by warranty?

Many dishwashers have a one year parts and labor warranty, with some components covered for longer. Check your owner manual or contact the manufacturer. If the machine is under warranty, a dealer service visit may be free.