Dishwasher Won't Fill or Has Low Water — Is the Inlet Valve the Problem?
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Understanding the Problem
If your dishwasher won't fill, fills very slowly, or only gets a trickle of water, the water inlet (inlet valve) and related inlet components are among the most common causes. The inlet valve is an electrically controlled solenoid that opens to let household water into the dishwasher at the start of a cycle. When the valve or its inlet screen gets clogged, or the solenoid fails, the machine will not receive the correct amount of water. Other items can mimic inlet-valve failure: a closed or partly closed house shutoff, a clogged inlet screen (small filter) on the valve, a stuck float or float switch that falsely signals the machine is full, a faulty door latch/pressure switch, or electrical issues (no voltage to the valve). Start with simple checks (supply on, screens clean, float moves freely) before replacing the valve itself.
Common Symptoms
No water entering the dishwasher, only a trickle of water, error codes related to water fill, long fill times, audible humming from the valve without water flow, or dishwasher cancelling the cycle due to no fill.
Common Causes
- Clogged inlet screen or debris in the water supply line restricting flow
- Failed or electrically open inlet valve solenoid (no continuity or won't open when energized)
- Float assembly or float switch stuck/defective, or closed house shutoff/low incoming water pressure
Popular Parts That Fix This Problem
These are the most common replacement parts that fix this problem. When you're ready to order, click below to find the right part at PartsDiscount.com — just search by your appliance model number for a guaranteed fit.
Helpful Repair Tip
Turn off power and water, remove the dishwasher kickplate and inspect the inlet valve screen for debris. If the screen is clean, test the valve coil with a multimeter for continuity and verify it receives 120V (or the nominal voltage for your model) during the fill portion of the cycle to confirm a bad solenoid.
Frequently Asked Questions
How do I know if the inlet valve is bad or if it's a water supply problem?
First confirm the house shutoff to the dishwasher is fully open and you have normal cold-water pressure at other fixtures. Remove the inlet hose from the valve (with water off) to check for flow and debris. Inspect the small inlet screen—if clogged, clean it. If the screen is clear but the valve won't admit water during a fill cycle, disconnect power and check the valve coil with a multimeter for continuity; then with safety precautions, verify the valve receives voltage when the machine is starting a fill. No voltage points to control/board/float issues; voltage present with no open valve indicates a failed inlet valve solenoid that needs replacing.
Can I run the dishwasher with a partially working inlet valve or bypass the valve?
Do not bypass the inlet valve. Bypassing could allow uncontrolled water into the dishwasher and cause flooding. A partially working valve may allow some cycles to run but will lead to poor wash performance and potential damage. Replace a faulty inlet valve or repair the supply and inlet screen issues. If you need the dishwasher back in service immediately, only a complete replacement of the valve (or temporary installation by a qualified technician) is safe.
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