What is a dishwasher turbidity sensor?

A turbidity sensor measures how dirty the water in your dishwasher is. It helps the dishwasher determine the necessary wash cycle length and water temperature for effective cleaning, optimizing performance and conserving water by adjusting the cycle based on soil level.

How do I know if my turbidity sensor is bad?

Common signs of a failing turbidity sensor include dishes that are not clean after a cycle, the dishwasher running unusually long, or displaying specific error codes related to water sensing. The dishwasher might also fail to start if the sensor prevents it from detecting water conditions.

Can I clean a turbidity sensor instead of replacing it?

While some minor buildup on the sensor lens can occasionally be cleaned to restore function, a faulty turbidity sensor often requires full replacement. If the sensor has failed electronically, cleaning will not resolve the issue, and a new part is necessary for proper operation.

Dishwasher Turbidity Sensor Replacement Guide

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Supplying Demand WD21X25468 Dishwasher Pressure Sensor Replacement

Alternate part numbers include AP6976524.
Monitors the water pressure and relays this information back to the main control board | Fits model specific dishwashers
It is important to disconnect your appliance from the power and water supply before servicing.
Supplying Demand replacement parts are compatible with Major Brands, but you should always verify fitment with your specific model. We have included a video in the product gallery to help you find your model number an...
SD products come in Supplying Demand packaging.

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What the SDWD21X25468 does

A turbidity sensor detects the cloudiness or dirtiness of the wash water in a dishwasher. It helps the appliance determine the appropriate wash cycle duration and water usage for effective cleaning.

Symptoms when this part fails

Dishes not getting clean
Dishwasher running excessively long cycles
Dishwasher stopping mid-cycle
Error codes related to water sensing

Compatibility

Fits the Maytag family. Specifically:

Any unit originally equipped with OEM part number(s): SDWD21X25468.
Check the model/rating plate inside your appliance and compare it against the fitment table on the product listing before ordering — this guide does not list specific compatible models because Amazon does not provide verified fitment data through this pipeline.

Tools you'll need

Screwdriver set
Pliers
Towels
Nut driver set

Difficulty: Moderate · Time: 30-60 minutes

How to install the SDWD21X25468, step by step

Disconnect the dishwasher from electrical power.
Shut off the water supply to the dishwasher.
Remove the lower access panel or kickplate.
Locate the turbidity sensor, typically near the sump or wash pump.
Disconnect any wiring harnesses and water lines or hoses attached to the sensor.
Carefully unmount and remove the old turbidity sensor.
Install the new sensor, ensuring all connections are secure.
Restore water and power, then test the dishwasher for proper operation.

Related troubleshooting

If swapping this part doesn't fix the issue, check these next:

What is a Dishwasher Turbidity Sensor and How it Works