How to Replace the Water Inlet Valve on a KitchenAid Dishwasher (W10872255)

The water inlet valve controls water flow from your household supply into the KitchenAid dishwasher tub. When this valve fails, the dishwasher either will not fill at all (displaying error F8E4 or F9E1), fills extremely slowly, or in rare cases leaks water into the tub when the unit is off. Part number W10872255 is the standard inlet valve for KitchenAid KDTE and KDTM models, and it is identical to the Whirlpool equivalent since both brands share the same platform.

The inlet valve is an electrically-operated solenoid. When the control board sends 120V AC to the solenoid coil, it opens an internal diaphragm allowing water to flow. When power is removed, a spring closes the diaphragm. Failures are typically the solenoid coil burning open (no fill) or the diaphragm failing to close completely (slow leak when off).

Before You Start

• Tools needed: 1/4" hex nut driver (kick plate), adjustable wrench (supply line), needle-nose pliers (hose clamp), multimeter, towels, bucket
• Parts needed: Water inlet valve W10872255 (~$25-$55)
• Time required: 30-45 minutes
• Difficulty: Intermediate
• Safety warning: Turn off the water supply valve under the sink FIRST, then disconnect power at the circuit breaker. Residual water under pressure is in the supply line. Have a bucket and towels ready. The inlet valve is located behind the kick plate on the lower left side of the unit.

Confirming Inlet Valve Failure

Before ordering, verify the valve is the problem:

1. Check that the supply valve under the sink is fully open (most common false alarm)
2. Inspect the supply line for kinks, especially where it bends behind the dishwasher
3. Remove the kick plate and check the inlet screen. The valve has a small mesh screen where the supply line connects. Sediment clogs this screen over time. If clogged, clean it and test before ordering a new valve
4. If the screen is clear and supply is open, disconnect power, remove the wire harness from the valve, and test solenoid resistance: 500-1500 ohms is normal. Open (infinite/OL) means the coil is burned out
5. For slow-leak diagnosis (water in tub when off): close the supply valve. If water stops appearing, the inlet valve diaphragm is not sealing and the valve needs replacement

Step-by-Step Instructions

Step 1: Turn Off Water and Power

Close the water supply valve under the kitchen sink (typically a 1/4-turn ball valve on the hot water line). Turn off the circuit breaker for the dishwasher. Place a bucket under the supply line connection to catch residual water.

Step 2: Remove the Kick Plate

Remove the two 1/4" hex screws at the lower front of the unit. Pull the kick plate forward and down.

Step 3: Locate the Inlet Valve

The inlet valve sits on the lower left side of the unit (as you face the front). It is a black or blue plastic body with a brass inlet fitting (where the household supply connects) and a rubber hose outlet (going up to the tub). The solenoid is a cylindrical coil mounted on top of the valve body.

Step 4: Disconnect the Water Supply Line

Using an adjustable wrench, loosen the brass compression fitting or braided supply line nut where it connects to the valve inlet. Turn counterclockwise. Water will drain from the line into your bucket. Fully remove the nut and pull the supply line off the valve.

Step 5: Disconnect the Fill Hose

The valve outlet connects to a rubber hose leading up to the tub. This hose is secured with a spring clamp. Squeeze the spring clamp ears with pliers, slide it back along the hose, then twist and pull the hose off the valve outlet barb.

Step 6: Disconnect the Electrical Connector

The solenoid wire harness is a 2-pin connector. Press the locking tab and pull the connector straight off. Note the orientation for reinstallation, though the connector is keyed and only fits one way.

Step 7: Remove the Valve Mounting Bracket

The inlet valve is secured to the dishwasher frame with a mounting bracket and 1-2 screws (Phillips or Torx T20 depending on model year). Remove the screws and slide the valve assembly out of its bracket.

Step 8: Install the New Valve

Position the new valve in the mounting bracket. Install the mounting screws. Reconnect the electrical harness (push until click). Reconnect the fill hose to the outlet barb and slide the spring clamp back into position. Reconnect the supply line to the inlet fitting and tighten the nut.

Step 9: Check the Inlet Screen

Before connecting the supply line, verify the new valve's inlet screen is properly seated. Some replacement valves ship without a screen installed. If your old valve's screen is in good condition, transfer it to the new valve.

Step 10: Test for Leaks

Turn on the water supply slowly. Watch the supply line connection and the fill hose connection for drips. Restore power. Start a cycle and verify the dishwasher fills normally (you should hear water entering the tub within 30 seconds of cycle start). Monitor from below for any leaks at connections.

Troubleshooting After Replacement

• If the new valve does not open (no fill, F8E4 persists), verify the connector is fully seated. Then test for 120V AC at the valve connector during the fill phase. No voltage means the control board is not sending the fill signal
• If water flow is weak, check that you did not over-tighten the supply line compression fitting, which can collapse the line. Also verify the inlet screen is not installed backwards
• If the new valve hums but does not flow, water pressure may be too low. The valve requires 20-120 PSI to operate
• If water continues to appear in the tub when the dishwasher is off, verify the supply valve is closed. If it stops, the new valve is working correctly

When to Call a Professional

• If the supply line uses a non-standard connection (older copper supply with soldered compression fitting), plumbing work may be needed
• If error codes persist after valve replacement, the control board may need diagnosis
• If you notice corrosion on the supply line or valve mounting bracket, the water line should be replaced simultaneously

Cost Comparison: DIY vs Professional

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FAQ

Q: Is the KitchenAid inlet valve the same as Whirlpool? A: Yes. Part W10872255 is identical across KitchenAid and Whirlpool dishwashers on the shared platform. The valve body, solenoid, and mounting are the same physical component.

Q: Can a bad inlet valve cause my KitchenAid dishwasher to overflow? A: In theory, if the valve sticks open it could overfill. However, KitchenAid dishwashers have a float switch safety that cuts power to the valve at maximum water level, plus an overflow protection tray underneath. A stuck valve more commonly causes slow leak when off.

Q: Why does my KitchenAid dishwasher take so long to fill? A: Slow fill is usually a clogged inlet screen rather than a failed valve. Remove the supply line from the valve and inspect the mesh screen. Hard water areas accumulate sediment that restricts flow. Clean the screen before replacing the entire valve.

Q: My dishwasher fills with water when turned off. Is that the inlet valve? A: Yes, this is the classic symptom of a failed inlet valve diaphragm. The internal seal no longer holds against water pressure. Replace the valve. As a temporary measure, close the supply valve under the sink when the dishwasher is not in use.

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