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Fix a dishwasher that will not fill

We'll shut off the water first, then check the supply valve, inlet screen, water inlet valve, float switch, and drain hose—or tell you when to call a pro.

Troubleshooting · Home appliances
15–45 min
What you'll need
  • Multimeter (for continuity tests on inlet valve)
  • Screwdriver set (Phillips and flathead)
  • Replacement water inlet valve or float switch (if tests show a fault)
Step 1 of 14

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Steps

Goal: Shut off water first, then confirm the symptom and isolate the fill fault.

  • Shut off the dishwasher supply valve under the sink (or the main supply if no valve). Open a faucet briefly to relieve pressure.
  • Start a normal wash cycle. Listen for the pump and spray arms. If the tub stays dry after one to two minutes, the fill system has failed.
  • Good: The tub stays dry—fill fault. Proceed to Check supply valve and inlet screen.
  • No problem: The tub fills normally—fill system is working. No action needed.

Shut off water first

Goal: Confirm water is off before disconnecting the supply line or working on the inlet.

  • Turn the dishwasher supply valve under the sink clockwise until it stops. If there is no valve, shut off the main water supply.
  • Open a faucet briefly to relieve pressure. You should see the valve fully closed and no water flowing when you start a cycle.
  • When the valve is off, you can safely disconnect the supply line for inspection.

Check supply valve and inlet screen

Goal: Rule out a closed valve or clogged inlet before opening the dishwasher.

  • Locate the dishwasher supply valve under the sink. Turn it counterclockwise until fully open. If the valve is stuck or corroded, do not force it—call a plumber.
  • Shut off the water again. Disconnect the supply line from the dishwasher inlet. Look inside the inlet port for the inlet screen. Remove debris, rinse, reinstall.
  • Good: Valve is open and screen is clear. Proceed to Inlet valve and float switch.
  • Bad: Valve stuck or screen cannot be cleared—call a plumber or replace the inlet assembly.

Inlet valve and float switch

Goal: Test and replace the water inlet valve or float switch if faulty.

  • Unplug the dishwasher. Locate the water inlet valve (where the supply line connects). Test for continuity with a multimeter or apply 120 V to the solenoid to see if it opens. Replace if faulty.
  • Locate the float switch (usually in the tub bottom). Move it up and down by hand. If it does not move freely, clear debris or replace the switch.
  • Check the drain hose for a proper high loop above the flood rim of the sink. Reposition if the loop is missing or too low.
  • Good: You found and replaced the faulty part. Reassemble and test—the dishwasher should fill.
  • Bad: All components check good but the dishwasher still does not fill—timer or control board has failed. Call a pro.

When to get help

Call an appliance technician if:

  • The supply valve is stuck or corroded (a plumber for the valve).
  • The timer or control board has failed.
  • You have checked all components and the dishwasher still does not fill.
  • You are not comfortable working with water connections or electrical components.

Verification

  • The tub fills with water within one to two minutes of starting a cycle.
  • No leaks at the supply connection or inlet.
  • The spray arms rotate and water circulates during the wash phase.
  • The float switch rises as the tub fills and stops the fill when full.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Confirm symptom Verify the dishwasher runs but the tub stays dry; rule out a different problem.
  2. Supply valve and inlet screen Check the valve is open and the inlet screen is not clogged.
  3. Water inlet valve and float switch Test and replace the inlet valve or float switch if faulty.
  4. Drain hose and high loop Check that the drain hose has a proper high loop to prevent siphoning.
  5. Call a pro Timer or control failure, stuck supply valve, or repeated failures—call an appliance technician or plumber.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Whether the supply valve is open
  • Condition of the inlet screen
  • Inlet valve and float switch test results
  • Drain hose loop configuration
  • Steps already tried

Does the dishwasher run but the tub stay dry?

Start a normal wash cycle. Listen for the pump and spray arms. If the tub stays dry after one to two minutes, the fill system has failed.

Start a normal wash cycle. Listen for the pump. Yes: tub stays dry—fill fault. No: tub fills normally—no action needed; the fill system is working.

Yes No

You can change your answer later.

No action needed

The tub fills normally. The fill system is working. No further action required.

Done

Is the water supply shut off before repair?

Always shut off the dishwasher supply valve under the sink before disconnecting the supply line or working on the inlet.

Turn the supply valve clockwise until it stops. If no valve, shut off the main supply. Good: valve closed—proceed. Bad: water still on—shut it off, then return to the start.

Yes No

You can change your answer later.

Shut off the water first

Turn the dishwasher supply valve under the sink clockwise until it stops. If no valve, shut off the main water supply. Open a faucet briefly to relieve pressure. Then return to the start of this guide.

Done

Is the supply valve fully open when testing?

The valve under the sink must be fully open for the dishwasher to receive water.

Locate the dishwasher supply valve under the sink. Turn it counterclockwise until fully open. Stuck or corroded: do not force—call a plumber. Open: proceed to inlet screen.

Yes No (stuck)

You can change your answer later.

Is the inlet screen clear of debris?

A clogged inlet screen blocks water flow. Disconnect the supply line and inspect the inlet port.

Disconnect the supply line. Inspect the inlet screen inside the inlet port. Remove debris, rinse, reinstall. Good: screen clear. Bad: screen damaged or cannot be cleared—replace inlet assembly or call a pro.

Yes No (clogged)

You can change your answer later.

Clean inlet screen and test

Remove the inlet screen, rinse it, reinstall. Reconnect the supply line and turn the water on. Run a test cycle. The dishwasher should fill if the screen was the only blockage.

Done

Does the water inlet valve open when energized?

The water inlet valve is a solenoid that opens when the dishwasher calls for fill. Test with a multimeter or by applying 120 V.

Unplug the dishwasher. Locate the water inlet valve. Test for continuity or apply 120 V to the solenoid. No continuity or does not open: replace with exact match. Opens: proceed to float switch.

Yes No (faulty)

You can change your answer later.

Replace water inlet valve and test

Replace the water inlet valve with an exact match. Reconnect the supply line and restore power. Run a test cycle. The dishwasher should fill.

Done

Does the float switch move freely?

A stuck float switch can prevent filling. The float should drop when the tub is empty.

Locate the float switch (usually in the tub bottom). Move it up and down by hand. Stuck: clear debris or replace. Free: check drain hose high loop. If all good and still no fill, timer or control has failed—call a pro.

Yes No (stuck)

You can change your answer later.

Replace float switch and test

Replace the float switch with a matching part. Run a test cycle. The dishwasher should fill. If it still does not fill, the timer or control board has failed—call a pro.

Done

Does the drain hose have a proper high loop?

A drain hose looped too low can siphon water out. If the loop is correct and all other components check good but the dishwasher still does not fill, the timer or control has failed.

Check the drain hose. It should have a high loop above the flood rim of the sink before descending to the drain. Reposition if needed. Loop correct, still no fill: all components good—timer or control failure; call a pro. Loop wrong: fix the loop and test.

Yes (all good, still no fill) No (fix loop)

You can change your answer later.

Fix drain hose loop and test

Reposition the drain hose so it rises above the flood rim of the sink before connecting to the drain. Secure it. Run a test cycle. The dishwasher should fill without siphoning.

Done

Call a technician

Call an appliance technician if: the supply valve is stuck or corroded (plumber for the valve); the timer or control board has failed; you have checked all components and the dishwasher still does not fill; or you are not comfortable working with water connections or electrical components.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would a dishwasher run but not fill with water?
Common causes: the supply valve under the sink is closed or partially closed, a clogged inlet screen, a faulty water inlet valve, a stuck float switch, or a failed timer or control board. Shut off the water, then check each in order.
Can I fix a dishwasher that will not fill myself?
Yes. You can check and open the supply valve, clean the inlet screen, and test or replace the water inlet valve and float switch with basic tools. If the timer or control board has failed, or if you are not comfortable with the repair, call an appliance technician.
When should I call a technician for a dishwasher that will not fill?
Call a technician if the timer or control board has failed, if you have checked all components and the dishwasher still does not fill, or if you are not comfortable working with water connections or electrical components.

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