Dishwasher Won't Take In Water (Troubleshooting Guide)

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Quick answer

Check the water supply valve and filter. Inspect the inlet valve for clogs or damage. Clean the float switch if it's stuck.

Check Water Supply Valve
Do: Locate the valve behind the dishwasher and ensure it's fully open.
Observe: Valve is open and water flows freely.
Means: Water supply is active.
Next: Check inlet valve filter.
Check Inlet Valve Filter
Do: Remove the inlet valve and clean the filter screen.
Observe: Filter is clean and free of debris.
Means: No clog in the filter.
Next: Test inlet valve operation.
Test Inlet Valve Operation
Do: Set the dishwasher to fill and listen for a humming sound from the valve.
Observe: Valve hums and water flows into the dishwasher.
Means: Valve is working properly.
Next: Inspect float switch.
Inspect Float Switch
Do: Check if the float switch is stuck or damaged.
Observe: Float moves freely and resets properly.
Means: Float switch is functional.
Next: Check water pressure.
Check Water Pressure
Do: Use a pressure gauge to measure water pressure at the inlet valve.
Observe: Pressure is between 20–120 psi.
Means: Adequate water pressure for operation.
Next: Replace inlet valve if needed.
Replace Inlet Valve
Do: Install a new inlet valve using a wrench and screwdriver.
Observe: Valve is securely connected and water flows.
Means: New valve is functioning.
Next: Test dishwasher operation.
Test Dishwasher Operation
Do: Run a short cycle to verify water is entering properly.
Observe: Dishwasher fills with water as expected.
Means: Issue is resolved.
Next: Complete

Cause	Likelihood	Difficulty	Part often needed
Clogged Inlet Valve Filter Debris blocks water flow to the dishwasher.	Common	Easy	Inlet Valve Filter Kit
Faulty Inlet Valve Valve fails to open and allow water in.	Common	Medium	Inlet Valve Assembly
Stuck Float Switch Float prevents water intake if stuck in the up position.	Sometimes	Easy	Float Switch
Low Water Pressure Insufficient pressure prevents proper filling.	Sometimes	Easy–Medium	Pressure Regulator
Closed Water Supply Valve Valve is shut off, blocking water flow.	Rare	Easy	None
Blocked Inlet Hose Mineral buildup or debris clogs the hose.	Sometimes	Medium	Inlet Hose
Faulty Water Supply Line Cracks or kinks in the line restrict water flow.	Rare	Medium	Water Supply Line
Malfunctioning Control Board Board fails to activate the inlet valve.	Rare	Hard	Control Board

Common replacement parts for a dishwasher that won't take in water include:

Purchase OEM parts for compatibility with your dishwasher model.

How do I know if the inlet valve is faulty?

If you hear no humming sound when the dishwasher should be filling, the inlet valve is likely faulty.

Can low water pressure affect the dishwasher?

Yes, low pressure (below 20 psi) can prevent proper water intake.

How often should I clean the inlet valve filter?

Clean it every 6–12 months to prevent clogs.

Is it safe to replace the inlet valve myself?

Yes, if you turn off power and water first. Follow manufacturer instructions carefully.

Why won't my dishwasher fill even with the valve open?

A clogged filter, faulty valve, or stuck float switch could be the cause.