What does a dishwasher turbidity sensor do?

It detects how cloudy or dirty the wash water is. This information helps the dishwasher's control board decide if the dishes are clean enough or if more wash cycles or rinse time is needed, optimizing water and energy usage.

How can I test a turbidity sensor?

Testing typically involves using a multimeter to check for continuity or resistance, or observing voltage signals if the control board is providing power. Consult your appliance's service manual for specific testing procedures and expected readings.

Can a dishwasher run without a turbidity sensor?

While some older models might not have one, modern dishwashers rely on the turbidity sensor for efficient operation. Without it, the dishwasher might run longer than necessary, use more water, or display error codes, leading to poor cleaning results.

GE Dishwasher Turbidity Sensor Replacement Guide

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Generic WD21X22830 Dishwasher Turbidity Sensor Genuine OEM Part

This turbidity sensor (part number WD21X22830) is for dishwashers. Turbidity sensor WD21X22830 detects soil level in the water and sends the information to the control board.
Manufacturer Part # WD21X22830
Replaces : 4466719, AP6032560, PS11762982, EAP11762982
Compatible list with Brands : GE
Information (important) : Use of the Manufacturers trade names and logos are the registered trademarks of their respective owners. Use of them does not associated with, imply any affiliation or endorsement by any manu...

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What the WD21X22830 does

The turbidity sensor measures the cleanliness of the wash water in a dishwasher. It signals the control board to determine if more washing time or rinse cycles are needed.

Symptoms when this part fails

Dishes not cleaning properly
Dishwasher running excessively long cycles
Dishwasher stopping mid-cycle
Error codes related to water quality

Compatibility

Fits the GE family. Specifically:

Any unit originally equipped with OEM part number(s): 4466719, AP6032560, PS11762982, EAP11762982.
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.

Also replaces: 4466719, AP6032560, PS11762982, EAP11762982

Tools you'll need

Phillips head screwdriver
Torx screwdriver
Pliers
Towel

Difficulty: Moderate · Time: 30-60 minutes

How to install the WD21X22830, step by step

Disconnect power to the dishwasher at the circuit breaker.
Shut off the water supply to the dishwasher.
Remove the lower dish rack and spray arm from the dishwasher tub.
Locate and remove the old turbidity sensor from the sump assembly.
Disconnect the electrical connector from the sensor.
Install the new turbidity sensor, ensuring it seats correctly.
Reconnect the electrical connector and reassemble the dishwasher.
Restore water supply and power, then run a test cycle.

Related troubleshooting

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

What is a Dishwasher Turbidity Sensor and How it Works