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Dishwasher Won't Fill With Water but Has Power

Updated August 15, 20263 min readTime needed: 10–15 minutes
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Short answer: If the dishwasher powers on normally but never takes on water, check the simplest cause first: the water supply shutoff valve behind or under the sink may be closed, often after other under-sink work. A stuck float switch (which can falsely signal 'already full') or a faulty inlet valve are the next most common causes.

Because the display and controls work normally, the machine clearly has power — this narrows things down specifically to the water supply path, which has only a few realistic points of failure.

What you noticeMost likely cause
Started after other plumbing work nearbyWater shutoff valve closed
Float doesn't move freely by handStuck float switch
Everything checks out but still no waterClogged or failed inlet valve
A specific fault code is displayedCheck your manual for the exact component it points to

Common Symptoms

  • Display and controls respond normally, but no filling sound follows starting a cycle
  • The cycle may pause or show a fill-related fault code
  • No water visible in the tub at any point
  • The problem may have started after plumbing work under the sink

Likely Causes

1. Water supply shutoff valve closed

The dedicated valve supplying the dishwasher, usually under the sink, can be closed accidentally during other plumbing work and simply never reopened.

2. Float switch stuck in the 'up' (full) position

A small float in the tub tells the machine when to stop filling — if it's stuck up (from being bumped or debris underneath it), the machine thinks it's already full and won't add water.

3. Clogged inlet valve screen

A small mesh screen where the water line enters the machine can clog with sediment over time, restricting or fully blocking incoming water.

4. Failed water inlet valve

The solenoid valve itself can fail electrically or mechanically, which is a less common but real possibility once supply and float switch are ruled out.

Safe Checks You Can Do

  • Check the water shutoff valve under the sink, confirming it's turned fully to open.
  • Check the float (a small dome or cylinder on the tub floor) to see if it's stuck up or has debris trapped beneath it.
  • Run another sink or appliance to confirm your home's water supply itself is working normally.
  • Unplug the dishwasher before doing any closer inspection near the water inlet.

Step-by-Step Solution

  1. 1

    Check the shutoff valve first

    This is the fastest and most common fix — confirm the dedicated water valve for the dishwasher, usually under the sink, is fully open.

  2. 2

    Inspect and free the float switch

    Gently lift and release the float to check it moves freely, and clear away any debris that might be trapping it in the raised position.

  3. 3

    Check for a fault code

    Check your manual for what any displayed code specifically indicates, which can point directly at the float switch or inlet valve.

  4. 4

    Note the pattern for service if it persists

    Whether the float moves freely and the supply valve is open are both useful details to have ready if you need a technician for the inlet valve itself.

What Not to Do

  • Don't assume the machine itself is broken before checking the shutoff valve — it's an easy, common, non-appliance cause.
  • Don't force the float switch if it feels stuck rather than gently checking for an obvious obstruction.
  • Don't attempt to test or replace the inlet valve's electrical components yourself.

When to Call a Professional

  • The shutoff valve is open, the float moves freely, and water still won't enter.
  • You suspect the inlet valve itself has failed and needs replacing.
  • The inlet screen is clogged with mineral buildup that a simple check doesn't clear.

Safety warning

Always unplug the dishwasher before inspecting near the water inlet valve. If the inlet valve itself needs testing or replacement, this involves both electrical and plumbing connections best handled by a qualified technician.

Frequently Asked Questions

Why would a shutoff valve just close on its own?

It rarely closes on its own — this is most often the result of other under-sink plumbing work (like fixing a leak or installing a garbage disposal) where the valve was closed and not reopened afterward.

How do I know if the float switch is the problem?

Check it for free movement by hand — it should lift and drop back down smoothly. If it's stuck in the raised position or has debris trapped underneath, that's a strong sign it's telling the machine the tub is already full.

Is this different from a dishwasher that fills but doesn't wash?

Yes — this is about no water entering at all, which points to the supply, float switch, or inlet valve. A machine that fills normally but doesn't wash has a completely different fault in the wash pump or motor.

Home Solutions Editorial Team

Reviewed against manufacturer documentation. Updated August 15, 2026. How we write guides

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