Dishwasher Inlet Valve – How to Diagnose and Which Part Fixes the Problem
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Understanding the Problem
The dishwasher inlet valve (water inlet solenoid) controls the water entering the machine. When it works correctly the valve opens only when the control board calls for water and closes tightly when filling is done. If the valve is clogged, the solenoid fails, or the valve body is cracked, the dishwasher may not fill at all, may fill slowly, may continue filling (overfill), or may leak at the base. Failures are usually caused by debris or mineral buildup in the small inlet screen, a burned or open solenoid coil that no longer actuates, or a mechanical failure of the internal diaphragm/seat that prevents the valve from sealing. Less commonly the control board or float/float switch can falsely signal the valve to open or fail to stop it from opening, so diagnosing the valve itself is important before replacing other components.
Common Symptoms
Dishwasher doesn't fill, fills very slowly, keeps filling/overflows, leaks from the bottom, or displays fill/flood error codes.
Common Causes
- Clogged inlet screen or sediment in the valve
- Failed solenoid coil or internal valve diaphragm not sealing
- Control or float/pressure switch falsely signaling the valve (electrical fault)
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 supply line, and inspect the inlet screen for debris. Then test the valve coil with a multimeter for continuity and run a diagnostic/fill cycle while measuring voltage at the valve to confirm whether the control is sending power.
Frequently Asked Questions
Can I replace the dishwasher inlet valve myself?
Yes — replacing the inlet valve is a common DIY repair if you are comfortable turning off power and water, removing the toe-kick or access panel, and disconnecting the water line and electrical connector. Always cut power at the breaker, shut off the water, take photos of connections, and test for leaks after installation. If you’re not comfortable with electrical testing or water plumbing, hire a technician.
How do I know if the inlet valve is bad or the control is sending the wrong signal?
First check the valve screen and clean any debris. Use a multimeter to check the valve coil for continuity (no continuity often means a failed coil). Next, run a fill cycle and measure for voltage at the valve when the machine should be filling — if there is voltage but the valve doesn’t open, the valve is bad; if there is no voltage, the control, float switch, or wiring is the likely cause.
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