As an expert technician, I have diagnosed the Smeg dishwasher with error code E10: Turbidity sensor error.
Error Explanation
The E10 error indicates a communication or functional failure with the Turbidity Sensor (also known as the Optical Sensor or Aquatest). This component is located in the dishwasher sump and uses an infrared light beam to measure the clarity of the water. If the sensor detects that the water is too “cloudy” or if the sensor lens is blocked, the Control Board cannot determine if the water is clean enough to proceed, resulting in a cycle interruption.
Smeg dishwasher with error code E10: Troubleshooting Instructions
- Clean the Filters: Remove the Fine Filter and Coarse Filter at the bottom of the tub. Debris or grease buildup here can block the sensor’s line of sight.
- Check for Excessive Suds: If you used the wrong detergent or too much rinse aid, excessive foam can interfere with the optical beam. Run a rinse cycle with plain water to clear the suds.
- Inspect the Sensor Lens: Locate the Turbidity Sensor inside the sump (usually a small plastic “eye” or probe). Gently wipe the lens with a soft cloth to remove any film or calcium deposits.
- Inspect Wiring Harness: Access the bottom of the dishwasher by removing the lower kick plate. Check the wiring connections leading to the Turbidity Sensor for signs of corrosion, moisture, or loose pins.
- Test the NTC/Sensor: Use a multimeter to check the resistance of the integrated NTC Thermistor (temperature sensor) within the turbidity unit.
Expected Ohmic/Resistance Values
The Turbidity Sensor in Smeg units often incorporates an NTC Thermistor. While the optical part of the sensor cannot be easily tested with a standard multimeter, the thermistor portion should provide the following readings:
- At 20°C (68°F): Approximately 12k Ω to 15k Ω.
- At 25°C (77°F): Approximately 10k Ω.
- Wiring Continuity: 0 Ω (indicating no breaks in the wire from the sensor to the Control Board).
Estimated Repair Cost
- Replacement Turbidity Sensor: $45 – $115 USD (depending on the specific Smeg model and region).
- Labor (if professional is hired): $100 – $200 USD.
Safety Warnings
Warning: Always disconnect the dishwasher from the electrical power supply and turn off the water source before attempting any internal inspections or repairs. Failure to do so can result in electric shock or flooding. If you are testing live components with a multimeter, exercise extreme caution.
Repair Difficulty
DIY (Moderate): This repair is manageable for a confident DIYer. It requires basic tools (Screwdriver, Multimeter, Pliers) and involves accessing the underside of the unit. If the error persists after cleaning and checking the wiring, the Turbidity Sensor likely requires a full replacement.
I am a master Appliance Repair technician with over 35 years of experience in the field. I am passionate about helping people troubleshoot their appliances and fix common problems. My website, appliancemode.com, provides a wealth of information on troubleshooting common appliance issues and deciphering error codes. This website aims to empower people to tackle appliance repairs themselves and save money on service calls.
