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ErrBase

Whirlpool Dishwasher H2O Error Code: No Water Fill Detected

Quick Answer

H2O on a Whirlpool dishwasher is a no-fill detected error. Unlike F6 E1 which triggers on a slow fill, H2O triggers when the float switch or pressure sensor reports zero water even after the inlet valve should have opened. Check the supply valve, then the inlet valve (W10327249), and finally the float switch (W10195039).

H2O on a Whirlpool dishwasher is a no-fill detected error. Unlike F6 E1 which triggers on a slow fill, H2O triggers when the float switch or pressure sensor reports zero water even after the inlet valve should have opened. Check the supply valve, then the inlet valve (W10327249), and finally the float switch (W10195039). The float is a small plastic dome at the tub front-left - if it is stuck in the raised position, it permanently signals 'tub full' to prevent overfill, but paradoxically this also prevents filling from starting.

WhirlpoolDishwasherSeverity: moderate85% DIY Success
Time to Fix
15–45 min
Difficulty
beginner
Parts Cost
$8 – $38
Tools Needed
Multimeter, Flathead screwdriver

What Does the H2O Code Mean?

No water was detected in the tub after the fill cycle opened the valve. Unlike F6 E1 (slow fill), H2O means the sensor registered zero water. Check the float switch for debris causing it to stick in the up position.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Float switch stuck in raised position due to debris under it40%
Water inlet valve screen clogged or solenoid failed24%
Float switch itself failed (stuck contacts)22%
Supply valve under sink closed or partially closed14%

Symptoms You May Notice

  • H2O code displayed immediately at cycle start
  • No water heard entering the tub at all
  • Cycle aborts within 1-2 minutes
  • Tub is completely dry when code appears

Can you reset a Whirlpool dishwasher to clear the H2O code?

Hold Cancel/Drain for 3 seconds. After fixing the float or inlet valve, run a short rinse cycle to confirm water fills normally before running a full wash.

Tools Required for Diagnosis

MultimeterFlathead screwdriverAdjustable wrench

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

1

Open the door and look at the tub floor front-left corner

Open the door and look at the tub floor front-left corner. There is a small plastic dome or cap - the overfill float. Press it down and release it. It should pop back up with spring resistance. If it stays down freely or feels gritty, clean the area around its base with a damp cloth.

2

Confirm the dishwasher supply valve (angle stop) under the sink

3

With power disconnected

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name
Water Inlet ValveW10327249 · $22–$38
Float SwitchW10195039 · $8–$18

Repair vs. Replace Calculator

Appliance Age (Years)7 Yrs
Labor Approach
Our Verdict
REPAIR
Estimated Cost: $23 (Parts) vs $700 (New Machine)

Frequently Asked Questions

What is the difference between H2O and F6 E1?
F6 E1 triggers when the tub fills too slowly (partial blockage or low pressure). H2O triggers when the fill sensor detects zero water - typically a complete valve failure, a stuck float switch, or an immediately blocked supply.
Why would the float be stuck up?
Food particles, grease, or hard water scale can accumulate under the float base and physically prevent it from descending. When stuck up, the safety circuit interprets the tub as full and blocks the inlet valve from opening at all.

Related Whirlpool Dishwasher Error Codes

Code: F6 E1Whirlpool Dishwasher F6 E1 Error Code: Water Inlet FaultCode: E1 F6Whirlpool Dishwasher E1 F6 Error Code: Water Inlet Fault

Same Fix Works on These Brands

Whirlpool shares the same hardware platform with these brands. The diagnosis and repair steps are identical.

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Models Known to Experience H2O Errors

This repair applies to most Whirlpool dishwashers with this error code. Common model numbers include:

WDT780SAEM, WDF550SAHZ, WDT730PAHZ, WDT750SAHZ, WDT970SAHZ, WDF518SAHM, WDT720PADE

Last verified for technical accuracy on March 14, 2026