Dishwasher Not Filling Properly (Troubleshooting Guide)

On this page

Quick answer
Confirm the symptom
Tools and prep
Step-by-step troubleshooting
Common causes table
Parts matching
When to call a pro
FAQ
Related guides

Quick answer

If your dishwasher isn't filling properly, check the water supply valve is fully open and the inlet filter is clean. Inspect the inlet hose for kinks or blockages and ensure the float switch isn't stuck. If these don't resolve the issue, the inlet valve or pump may need replacement.

Confirm the symptom

Dishes aren't getting clean
Dishwasher makes noise but doesn't fill
No water entering during cycle
Water only fills partway and stops
Dishwasher completes cycle without water

Tools and prep

Screwdrivers (flathead and Phillips)
Adjustable wrench
Flashlight
Bucket or towel
Replacement inlet filter (if needed)
Voltage tester
Turn off power at circuit breaker
Shut off water supply to dishwasher

Step-by-step troubleshooting

Check Water Supply Valve
Do: Locate the water supply valve under the sink or near the dishwasher and ensure it is fully open.
Observe: Valve is open and not partially closed.
Means: If closed or partially closed, opening it will restore water flow.
Next: If valve is open, proceed to next step.
Inspect Inlet Filter
Do: Turn off power and water supply. Locate the inlet filter (usually on the water inlet valve) and remove it. Clean any debris or sediment.
Observe: Filter is clean and free of blockages.
Means: A clogged filter can restrict water flow.
Next: If filter is clean, proceed to next step.
Check Inlet Hose
Do: Inspect the inlet hose for kinks, cracks, or blockages. Straighten any kinks and replace damaged sections.
Observe: Hose is clear and unobstructed.
Means: A blocked or kinked hose prevents proper water flow.
Next: If hose is clear, proceed to next step.
Test Float Switch
Do: Locate the float switch in the bottom of the dishwasher tub. Gently lift it to see if it moves freely.
Observe: Float switch moves up and down without sticking.
Means: A stuck float switch can prevent the dishwasher from filling.
Next: If float switch is functional, proceed to next step.
Test Inlet Valve
Do: Use a voltage tester to check if the inlet valve is receiving power. If powered but not opening, it may be faulty.
Observe: Inlet valve receives power and opens when energized.
Means: A faulty inlet valve will need replacement.
Next: If inlet valve is faulty, replace it.
Check Water Pressure
Do: Turn on a nearby faucet to check water pressure. Low pressure can affect dishwasher performance.
Observe: Water flows steadily from the faucet.
Means: Low water pressure may require checking the home's main water supply.
Next: If water pressure is low, investigate further.

Common causes

Cause	Likelihood	Difficulty	Part often needed
Clogged Inlet Filter Sediment and debris can accumulate and block water flow.	Common	Easy	Inlet filter
Kinked or Blocked Inlet Hose Physical obstructions or kinks in the hose restrict water flow.	Common	Easy	Inlet hose
Stuck Float Switch The float switch prevents overfilling and may get stuck in the 'full' position.	Sometimes	Easy	Float switch
Faulty Inlet Valve The inlet valve may be defective and not allowing water to enter.	Sometimes	Medium	Inlet valve
Low Water Pressure Insufficient water pressure from the home's supply can affect filling.	Sometimes	Medium	Water pressure regulator
Malfunctioning Dishwasher Pump The pump may be damaged or clogged, affecting water intake.	Rare	Hard	Dishwasher pump

Parts matching

Common parts needed for a dishwasher not filling properly include:

Inlet filter
Inlet hose
Float switch
Inlet valve
Water pressure regulator
Dishwasher pump

Purchase OEM parts or high-quality replacements to ensure compatibility and performance.

When to call a professional

If the inlet valve is faulty and you're not comfortable replacing it yourself
If water pressure issues persist after checking the main supply
If the dishwasher pump is damaged and requires professional diagnosis
If the problem persists after checking all common causes and performing basic troubleshooting

FAQ

Why is my dishwasher not filling with water even though the supply valve is open?

A clogged inlet filter or a faulty inlet valve could be preventing water from entering the dishwasher. Check and clean the filter, or test the valve for proper function.

How do I know if the inlet valve is working properly?

Use a voltage tester to check if the valve is receiving power during the fill cycle. If powered but not opening, the valve is likely faulty and needs replacement.

Is low water pressure a common issue for dishwashers?

Low water pressure can affect dishwasher performance. Check other faucets in your home to determine if the issue is isolated or a broader supply problem.