KitchenAid Dishwasher Won't Fill — Water Inlet and Sensor Troubleshooting

If your KitchenAid dishwasher runs through its startup sequence but no water enters the tub, the wash arms stay dry and dishes come out exactly as they went in. This "won't fill" condition on KDTM and KDTE models has a limited set of possible causes — the water supply path is straightforward: household hot water supply → shutoff valve → supply line → inlet valve (W10872255) → tub. A failure at any point in this chain stops water from entering.

Fast Diagnostic Path

Before spending time on disassembly, run through these quick checks:

Step 1: Supply valve open? Check under the sink. The hot water valve branching to the dishwasher must be fully open (turned counter-clockwise to stop). This gets bumped closed surprisingly often during plumbing work.

Step 2: Water pressure adequate? Run the kitchen hot faucet. If pressure is normal, your supply is good. If pressure is low or absent, the issue is household plumbing — not the dishwasher.

Step 3: Listen during fill. Start a cycle and put your ear to the lower front of the dishwasher. You should hear a click (relay on the control board energizing the inlet valve solenoid) followed by the sound of water flowing within seconds.

• No click at all → Board relay not sending fill command, or no power to board
• Click but no water → Valve solenoid engages but valve is clogged, water supply is off, or supply pressure too low
• Click and water sound → Valve is working but water may be leaking before reaching tub (check connections behind toe plate)

Common Causes

1. Inlet Valve Failure (W10872255) — 40%

The solenoid-operated inlet valve opens on command from the control board. Failure modes include burned-out solenoid coil (open circuit — valve cannot open electrically) and mineral-clogged inlet screen or diaphragm (valve mechanically stuck closed even when energized).

Test: Disconnect power. Remove toe plate. Disconnect the valve's electrical connector. Measure resistance across solenoid terminals: 500–1500 ohms is normal. OL (infinite) means the coil is burned out — replace the valve.

Also check: The small inlet screen inside the valve port (where the supply line connects). Disconnect the supply line and look inside the port — a fine mesh screen catches sediment. If clogged with mineral scale, clean with vinegar or replace the screen.

Parts Cost: $25–$55 | Professional Repair: $100–$190

2. Float Switch Stuck UP — 25%

The float in the tub floor monitors water level. If stuck in the raised position (debris around the base, detergent cake, or a utensil that fell and trapped it up), the board reads "tub full" and will not command fill.

Test: Open the door, locate the float dome (front-left of tub floor). Press it down. It should move freely with a spring-back feel. If stuck, clean around the base. Remove the lower rack and spray arm for better access if needed.

Parts Cost: $0–$25 | Professional Repair: $89–$150

3. Supply Line Restriction — 18%

The braided stainless supply line between the shutoff valve and inlet valve can kink (especially behind a dishwasher that was recently pulled out and pushed back), or the internal rubber lining can deteriorate and collapse, restricting flow even though the line looks fine externally.

Test: Disconnect the supply line from the inlet valve. Hold the end over a bucket. Open the shutoff valve briefly. Water should flow freely and forcefully. If it trickles or does not flow, the line is kinked or collapsed — replace it.

4. Control Board Fill Relay — 12%

The relay on the main board (W11413276) that powers the inlet valve solenoid can fail open — no current reaches the valve. This is confirmed when the valve tests good (proper solenoid resistance) and the supply is confirmed, but no click is heard at cycle start.

Diagnostic mode verification: Enter diagnostics (tech sheet sequence), advance to the fill test. Measure voltage at the inlet valve connector during the test: should read 120V AC. If 0V, the board relay has failed.

Parts Cost: $150–$280 | Professional Repair: $250–$450

5. Supply Valve Partially Closed or Corroded — 5%

Old gate valves under sinks can partially seize in a partially-closed position. They look open but only allow a trickle. Or a newer quarter-turn ball valve may have a corroded ball that does not open fully.

Fix: Fully close then fully open the valve several times to break any corrosion. If it still restricts flow, replace the valve (a plumber task, not a dishwasher repair).

KitchenAid-Specific Notes

• The inlet valve W10872255 is shared with equivalent Whirlpool models — parts are widely available.
• KitchenAid specifies minimum 20 PSI water pressure for proper valve operation. Well-water systems or homes with pressure-reducing valves set low may fall below this threshold.
• The Clean Water Wash system only functions once water is in the tub — a no-fill condition means the filtration system is never tested. Do not confuse a no-fill with a filtration issue.
• On models with the ProWash cycle, a no-fill condition generates no special error code — the board simply times out and stops. Check for a generic fill-timeout code in diagnostic memory.

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