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Bosch · Dishwashers
Turbidity sensor (Aqua sensor) fault
Quick Answer
Error code E28 on your Bosch Dishwashers means: Turbidity sensor (Aqua sensor) fault. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
SHXM4AY55NSHEM3AY55NSHP95CM5NSHPM65Z55NSGX78B55UCSHXM88Z75NSHXM78Z55NSHX78CM5NSHP878ZD5NSHPM88Z75NSHPM78Z55NSHEM78Z55NSHX89PW75NSHV89PW73NSHE89PW75N
Likely Causes
  1. Turbidity sensor is dirty or coated with residue
  2. Turbidity sensor has failed electrically
  3. Wiring issue between the sensor and control board
  4. Sensor lens obscured by mineral deposits
How to Fix It
1
Turn off the dishwasher and unplug it.
2
Locate the turbidity sensor (typically in the sump area).
3
Clean the sensor lens with a soft cloth and mild cleaner.
4
Check the wiring connections for damage or corrosion.
5
If cleaning does not resolve the issue, the sensor will need replacement.
6
Symptoms of this fault include dishes not getting clean and dirty water remaining in the tub.
Pro Tip
This issue typically requires professional diagnosis. Attempting this fix without proper training could cause further problems.
Parts You May Need
Turbidity sensor / Aqua sensor
Related Error Codes
E0E01E02E03E04
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