GE Dishwasher Error Code C9: Turbidity Sensor Cleaning
Updated: February 2026
The GE dishwasher error code C9 appears when the turbidity sensor is dirty or malfunctioning. This sensor measures water clarity to optimize wash cycles and determine when dishes are adequately clean.
What Is the Turbidity Sensor?
The turbidity sensor (also called optical sensor or OWI) uses light transmission to detect particles and soil in the wash water. When the sensor window becomes coated with mineral deposits, grease, or detergent film, it can't accurately measure water clarity, triggering the C9 error.
Cleaning Instructions
- Step 1: Remove the lower dish rack to access the filter area at the bottom of the tub.
- Step 2: Remove the filter assembly by turning counterclockwise and lifting out. Set aside for cleaning.
- Step 3: Locate the turbidity sensor—a small clear or translucent window in the sump area, usually near where the filter sits.
- Step 4: Wipe the sensor lens with a soft, damp microfiber cloth. For stubborn buildup, dampen the cloth with white vinegar.
- Step 5: Gently clean the sensor housing and surrounding area to prevent immediate recontamination.
- Step 6: While the filter is out, rinse it thoroughly under hot running water to remove trapped debris.
- Step 7: Run an empty cycle with 2 cups of white vinegar in the bottom of the tub to clean the entire system and remove mineral deposits.
After cleaning, reinstall the filter and run a test cycle. The C9 error should clear once the sensor can accurately read water clarity. To prevent future C9 errors, use rinse aid to prevent spotting and film, clean filters monthly, and run a vinegar cleaning cycle quarterly. If C9 persists after thorough cleaning, the sensor may be permanently damaged and require replacement.
Takeaway: Now that you understand GE Dishwasher Error Code C9: Turbidity Sensor Cleaning, put this knowledge into practice. Real-world experience combined with this guide will make you an expert.
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