How to Replace KitchenAid Dishwasher Check Valve

What the check valve does#

On the drain phase, the pump pushes water through the check valve and out the hose, holding the valve open. When the pump stops, gravity and backpressure from the disposal would push water back toward the tub — the check valve closes to stop that. Over time the rubber stiffens, food debris or mineral scale props it open, and backflow starts. KitchenAid shares the Whirlpool platform, so the part and the access are the same.

Signs it has failed#

• A thin film of dirty water in the tub after it has sat idle
• A foul smell even after a clean cycle, from drain water flowing back in
• Food bits or coffee grounds on dishes that were clean when the cycle ended
• Gurgling from the drain after the cycle, as water runs backward

Tools and safety#

• Tools: 1/4-inch hex nut driver (kick plate), channel-lock pliers (spring clamps), a flashlight, towels
• Time: 15-20 minutes · Difficulty: beginner
• Safety: switch off the breaker so a cycle cannot start while the drain path is open; no wiring needs disconnecting, but water will drain, so lay towels down.

Step-by-step#

1. Cut power and open the kick plate#

Turn off the breaker, then remove the two 1/4-inch hex screws at the front bottom and pull the kick plate forward and down.

2. Find the check valve#

Follow the drain path from the pump outlet toward the drain hose. The valve lives in one of three spots depending on model: spliced inline in the drain hose, built into the pump outlet barb, or at the sump outlet. On most KitchenAid KDTE and KDTM models it is at the pump outlet where the drain hose connects.

3. Open the housing#

Squeeze the spring clamp with the channel-locks, slide it back, and pull the drain hose off the barb (or off both ends of an inline housing). The flapper or ball is now visible.

4. Remove the old valve#

Pull the old flapper or ball out and note its orientation — it only allows flow one way, sometimes marked by an arrow or a hinge direction.

5. Clean the seat#

Wipe the housing and seat clean of food debris, mineral scale, and any crumbling rubber. The new valve can only seal against a clean seat.

6. Fit the new valve#

Set the new valve in the same orientation — flow from pump toward the drain hose, blocked the other way — and push it fully home until it seats flush.

7. Reassemble and test#

Slide the drain hose back on the barb and reseat the spring clamp. Restore power, run a full cycle, then wait 30 minutes and check the tub — a working valve leaves it dry.

Troubleshooting#

• Water still returns: the drain hose needs a high loop up under the countertop (or an air gap); without it, gravity pulls water back regardless of the valve.
• Connected to a disposal: run the disposal clear first — backed-up food creates the backpressure that overwhelms the valve.
• A lot of water, not a film: the pump or its solenoid may not be fully draining — the check valve only stops backflow, it cannot make the tub drain.

Prevent the next failure#

Run the disposal before each wash, scrape large food off dishes, and in hard-water areas run a monthly vinegar cleaning cycle to keep scale off the valve.

When to call a professional#

Get help if you cannot find the valve on your model, if it is integrated into the pump and needs the pump pulled to reach, or if backflow continues after both a new valve and a correct high loop — that points to a plumbing or vent issue.