F25
Whirlpool Dishwasher
Severity: MinorWhat Does This Error Mean?
F25 means the turbidity sensor in your Whirlpool dishwasher has detected a fault. The turbidity sensor measures how dirty the wash water is — it tells the dishwasher whether to continue washing or move to rinse. When this sensor fails, the dishwasher cannot make smart washing decisions and stops the cycle. This is usually a sensor or connector issue.
Affected Models
- WDT730PAHZ
- WDF520PADM
- WDT970SAHZ
- WDTA50SAHZ
- Whirlpool dishwashers with soil sensing technology
Common Causes
- Turbidity sensor coated with hard water deposits blocking the optical sensor window
- Failed turbidity sensor with a damaged optical emitter or receiver
- Loose or corroded electrical connector at the turbidity sensor
- Food debris lodged directly against the sensor probe affecting its readings
- Defective main control board misinterpreting the turbidity sensor output
How to Fix It
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Run a power reset first. Turn off the dishwasher, unplug for 5 minutes, then restore power. This clears temporary faults and is always worth trying before disassembling anything.
If F25 does not return after the reset and a full cycle, it may have been a momentary sensor glitch.
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Remove the lower rack, spray arm, and filter assembly. The turbidity sensor is typically located in or near the sump area at the very bottom of the tub. It is a small component with an optical window.
The turbidity sensor looks similar to the thermistor but has a clear or frosted window that light passes through.
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Clean the turbidity sensor window thoroughly. Soak a cloth in white vinegar and wipe the sensor window. For stubborn mineral deposits, use a soft toothbrush with diluted white vinegar.
Hard water deposits on the optical window are the most common cause of F25 in hard water areas.
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Inspect the sensor's electrical connector. Disconnect it, look for corrosion or bent pins, clean with contact cleaner, and reconnect firmly.
A loose connection at the turbidity sensor causes intermittent F25 errors.
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If cleaning and connector checks do not fix F25, replace the turbidity sensor. Order by model number. Install the replacement, reassemble, and run a full heavy cycle to confirm the code is gone.
After replacement, run the dishwasher with a full load to ensure the sensor calibrates correctly with actual wash water.
When to Call a Professional
Turbidity sensors are usually accessible at the bottom of the dishwasher tub. Cleaning the sensor is a free DIY fix that resolves F25 in many cases. If cleaning does not help, sensor replacement costs $25 to $60 for the part. A technician will charge $100 to $180 total.
Frequently Asked Questions
What does a turbidity sensor do in a dishwasher?
A turbidity sensor shines a beam of light through the wash water. The cloudier the water, the less light gets through. The dishwasher's control board reads this signal to judge how dirty the water is. This allows smart dishwashers to extend the wash time for heavily soiled loads and shorten it for lightly soiled loads — saving water and energy.
Can I use the dishwasher without a turbidity sensor?
On models where it is a required sensor, F25 will prevent the cycle from running. On some models, you can bypass the sensor mode by selecting a manual timed cycle. Check your owner's manual for a manual cycle option.
How often should I clean my dishwasher sensors?
Clean the turbidity sensor and filter area monthly. In hard water areas, use a dishwasher descaler or a vinegar rinse cycle every month. This prevents scale from coating the sensor and causing F25.