Bosch Dishwasher Error Code E6

E6 on a Bosch dishwasher means the control board has detected a problem with the aqua sensor, also called the turbidity sensor. This sensor monitors water clarity during the wash cycle so the machine can adjust water usage and cycle time automatically. When the board receives a signal that is missing or outside the expected range, it stops the cycle and displays E6.

Running the dishwasher with an active E6 error is not recommended. The machine has halted the cycle because it cannot verify water conditions, so dishes will not be properly cleaned and the cycle will not complete normally. Continued attempts to run cycles without resolving the fault can also stress other components. Address the aqua sensor issue before resuming regular use.

Cleaning the aqua sensor is well within DIY reach for most homeowners. The sump area is accessible after removing the lower spray arm and filter assembly. Replacing the sensor itself is also a manageable DIY repair since it is a plug-in component on most Bosch models. If the wiring harness is damaged or the error points to the control board, a repair technician is a practical choice to avoid misdiagnosis.

Start by locating the aqua sensor on the sump assembly and cleaning it. Grease and limescale buildup on the sensor's optical lens is the most frequent cause of E6. Remove the sensor, clean the lens carefully with a soft cloth and a mild descaling solution, reinstall it, and run a test cycle. If the error returns, check the wiring harness connector at the sensor for corrosion or looseness before replacing the sensor itself.

If the sensor only needs cleaning, the repair costs nothing beyond your time. A replacement aqua sensor for a Bosch dishwasher typically costs between $20 and $60 for the part. If a technician is needed to diagnose and replace it, expect a total repair bill in the range of $100 to $200 depending on your location and labor rates. A control board replacement, which is rarely the actual fix, would cost significantly more.