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Error code reference

Whirlpool Dishwasher Error Code F8

Incorrect water level in tub

Whirlpool codesWhirlpool dishwasher codes

Incorrect water level in tub - mechanical water presence indicator (WI) toggles low more than 20 times in 2 minutes during wash phase; or optical water indicator (OWI) does not send signal after filling.

First step from the service manual

Check water presence indicator (WI or OWI) which should toggle at approximately 1 liter, check filters for blockage, check for excessive suds, verify salt cap is closed.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What F8 means on a Whirlpool dishwasher

The F8 error code on a Whirlpool dishwasher indicates an incorrect water level condition detected during the wash phase. The control board monitors water presence through one of two sensor types: a mechanical water presence indicator (WI) that toggles at approximately 1 liter of water, or an optical water indicator (OWI) that sends a signal to confirm adequate water presence after filling. The F8 fault triggers when the mechanical WI toggles low more than 20 times within a 2-minute window during washing, or when the OWI fails to send its confirmation signal following the fill cycle.

The most common causes fall into two categories: water level instability and sensor failure. Water level instability can result from excessive suds foaming inside the tub, which disrupts the sensor's ability to detect a stable water presence. A blocked or clogged filter assembly can also restrict water circulation and create inconsistent tub levels that cause the WI to oscillate repeatedly. A missing or improperly closed salt cap can introduce air into the water circuit and affect level stability.

If the water level and suds conditions check out as normal, the fault likely points to a failing WI or OWI sensor. A mechanical WI that is sticking or responding erratically will produce false low-level signals. An OWI that is fouled with debris or has an optical path obscured by residue will fail to transmit its confirmation signal. In either case, the control board cannot confirm a safe operating water level and halts the cycle to prevent damage.

Source: manufacturer service documentation.

Common causes of F8

  1. 01

    Excessive suds in the tub

    Wiring / connection

    Using too much detergent or the wrong type of detergent can create heavy foam that interferes with the water presence sensor's ability to detect a stable water level. Check the tub for visible suds and try running a rinse cycle without detergent.

  2. 02

    Clogged or blocked filters

    Wiring / connection

    A blocked filter assembly restricts water flow and circulation inside the tub, causing the water level to fluctuate and triggering repeated low-level sensor toggles. Remove and inspect the filters for food debris, grease buildup, or other blockages.

  3. 03

    Salt cap left open or missing

    Wiring / connection

    An open or missing salt compartment cap can allow air into the water system, destabilizing the water level detected by the sensor. Confirm the salt cap is properly seated and fully closed before running a cycle.

  4. 04

    Faulty mechanical water presence indicator (WI)

    Part replacement

    A mechanical WI that is sticking, worn, or responding erratically will toggle low repeatedly even when the water level is adequate. If water level, suds, and filters all check out normal, the WI itself may need replacement.

  5. 05

    Failed or fouled optical water indicator (OWI)

    Part replacement

    The OWI relies on a clear optical path to confirm water presence after filling. Residue or debris blocking the optical sensor will prevent it from sending the required signal to the control board. Cleaning the OWI lens or replacing the sensor may be necessary.

See the test procedure for each cause

Frequently asked questions about F8

What does F8 mean on a Whirlpool dishwasher?
The F8 code indicates an incorrect water level was detected in the tub during the wash phase. Specifically, it means the mechanical water presence indicator toggled low more than 20 times in 2 minutes, or the optical water indicator failed to send a confirmation signal after filling. The dishwasher stops the cycle until the water level issue is resolved. Common triggers include excessive suds, clogged filters, or a faulty water level sensor.
How do I fix the F8 error on my Whirlpool dishwasher?
Start by checking the filters for blockages and cleaning them if needed. Verify that the salt compartment cap is fully closed and that you are using the correct amount and type of detergent to avoid excessive suds. If those checks are normal, inspect the water presence indicator (WI or OWI) for damage or fouling. If the sensor is defective, it will need to be replaced to clear the fault.
Is it safe to keep using my dishwasher with an F8 error?
It is not recommended to continue running the dishwasher while the F8 error is active. The appliance has detected an abnormal water level condition and stopped the cycle as a protective measure. Running it in this state could result in poor cleaning performance or potential issues related to undetected water levels. Address the root cause before resuming normal use.
Will resetting my Whirlpool dishwasher clear the F8 error?
A reset may temporarily clear the F8 code, but the error will return if the underlying cause is not corrected. Resetting without fixing the problem means the dishwasher will likely fault again during the next fill and wash cycle. Diagnose and resolve the water level or sensor issue first, then reset the unit to confirm the fault is gone.
How much does it cost to repair an F8 error on a Whirlpool dishwasher?
If the fix is as simple as cleaning filters or securing the salt cap, there is no parts cost involved. If a water presence indicator or optical water indicator needs to be replaced, parts typically range from $15 to $60 depending on the specific sensor and model. Adding professional labor, the total repair cost could range from $80 to $200 or more. Diagnosing the exact failed component before ordering parts is recommended.

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