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Quick answer
Turn off the dishwasher power and water supply. Check the water inlet valve for clogs, ensure the water supply is on, and inspect the float switch for blockage. If the valve is faulty, replace it.
Confirm the symptom
- Dishes remain dirty after a cycle
- No water entering the dishwasher during operation
- No sound of water filling during the cycle
- Dishwasher completes cycle but doesn't clean
- Water supply line is connected and turned on
Tools and prep
- Screwdriver (flathead and Phillips)
- Needle-nose pliers
- Flashlight
- Bucket or towel
- Replacement inlet valve (if needed)
- Owner’s manual
- Turn off power at circuit breaker
- Shut off water supply to dishwasher
Step-by-step troubleshooting
- Check Water Supply Valve
Do: Locate the shutoff valve under the sink or near the dishwasher and ensure it is fully open.Observe: Valve is open and water flows freely.Means: Water supply is active.Next: Proceed to Step 2.
- Inspect Inlet Valve Filter
Do: Locate the inlet valve (usually at the back of the dishwasher near the water supply line) and remove the filter. Clean it under running water.Observe: Filter is clogged with debris.Means: Clogged filter is preventing water flow.Next: Reinstall the filter and restart the dishwasher.
- Test Inlet Valve Operation
Do: Set the dishwasher to a fill cycle (or manually start a cycle) and listen for a humming sound from the inlet valve.Observe: No sound or weak sound from the valve.Means: Valve may be faulty or not receiving power.Next: Test the valve’s electrical connections (see Step 4).
- Check Electrical Connections
Do: Unplug the dishwasher or turn off power at the circuit breaker. Inspect the wiring harness connected to the inlet valve for loose or damaged connections.Observe: Loose or damaged wires.Means: Poor connection is preventing the valve from opening.Next: Reconnect or replace damaged wiring.
- Inspect Float Switch
Do: Look inside the dishwasher tub for the float switch (a small plastic ball or lever). Ensure it moves freely and is not stuck in the raised position.Observe: Float is stuck or blocked.Means: Float prevents the dishwasher from filling if stuck.Next: Clear any blockage and test the dishwasher.
- Test Inlet Valve with Multimeter
Do: Set a multimeter to ohms and test the inlet valve’s resistance. A reading of 3,000–5,000 ohms indicates a working valve.Observe: No reading or very high resistance.Means: Inlet valve is faulty and needs replacement.Next: Replace the inlet valve.
- Check for Error Codes
Do: Consult the owner’s manual to identify any error codes displayed on the control panel that relate to water fill issues.Observe: Error code related to water supply or inlet valve.Means: Error code confirms a specific issue.Next: Follow manual instructions for the error code or replace the faulty part.
Common causes
| Cause | Likelihood | Difficulty | Part often needed |
|---|---|---|---|
| Clogged Inlet Valve Filter Mineral buildup or debris blocks water flow. | Common | Easy | Inlet valve filter |
| Faulty Inlet Valve Valve fails to open due to electrical or mechanical failure. | Common | Easy–Medium | Inlet valve |
| Float Switch Stuck Float prevents water from entering if it’s stuck in the raised position. | Sometimes | Easy | Float switch |
| Low Water Pressure Insufficient pressure from the home’s main supply. | Sometimes | Easy | None |
| Incorrect Dishwasher Settings Water-saving or quick wash settings may limit fill. | Rare | Easy | None |
| Tripped Circuit Breaker Power interruption prevents the valve from activating. | Rare | Easy | None |
| Blocked Water Supply Line Kinked or frozen line restricts water flow. | Rare | Medium | Water supply line |
Parts matching
Replace parts with the correct model number for your dishwasher. Check the owner’s manual for specifications.
- Inlet Valve: Look for model-specific valves compatible with your dishwasher brand.
- Float Switch: Ensure the switch matches the size and type in your unit.
- Water Supply Line: Use a flexible line rated for dishwasher use.
Purchase OEM parts if unsure; they ensure compatibility and reliability.
Recommended products
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When to call a professional
- Water leaks persist after replacing the inlet valve
- No power to the dishwasher despite checking the circuit breaker
- Dishwasher still won’t fill after all basic troubleshooting steps
- Error codes persist or indicate a main control board issue
- You’re unsure about electrical testing or part replacement
FAQ
Can a clogged filter cause the dishwasher to stop filling?
Yes, a clogged inlet valve filter is a common cause. Clean it with water to restore flow.
How do I know if the inlet valve is faulty?
If you hear no humming sound when the dishwasher should be filling, the valve is likely faulty.
Is it safe to test the inlet valve with a multimeter?
Yes, but always unplug the dishwasher first to avoid electrical shock.
Can a stuck float switch damage the dishwasher?
A stuck float can prevent water from entering, but it typically doesn’t cause damage unless ignored for a long time.
Why might the dishwasher fill but not clean dishes?
If water fills but dishes aren’t clean, the issue may be with the spray arms or detergent dispenser, not the fill system.