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Error code reference

Bosch Dishwasher Error Code E:8101

Aquasensor fault

Bosch codesBosch dishwasher codes
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What the E:8101 error code actually means

Your Bosch dishwasher is reporting a problem with a water-clarity sensor called the Aquasensor, which helps the machine decide how much water and time it needs to clean your dishes. Either the sensor is dirty and cannot do its job, there is a wiring issue connecting it to the control board, or your model may not actually have this sensor but the software is looking for it. Cleaning the sensor or checking its connections often resolves this error.

Diagnostic procedure

The full E:8101 procedure

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1
First diagnostic step
Check if the appliance is equipped with Aquasensor. Check the wires. Check if the Aquasensor is dirty.
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Most common causes of E:8101

Ranked by how often they cause this code
  1. 1Dirty or contaminated Aquasensor
  2. 2Wiring harness fault
  3. 3Aquasensor not installed but expected by control board
  4. 4Failed or defective Aquasensor
  5. 5Control board unable to process sensor signal

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Questions people ask about E:8101

What does E:8101 mean on a Bosch dishwasher?
E:8101 indicates an Aquasensor fault. The Aquasensor is an optical sensor that measures water clarity during the wash cycle. The error appears when the sensor is missing, its calibration fails, or the control board cannot communicate with it due to wiring or contamination issues.
Will resetting my Bosch dishwasher clear the E:8101 error?
A reset may temporarily clear the code, but it will return if the underlying cause is not addressed. If the sensor is dirty or a wiring fault exists, the calibration will fail again at the start of the next cycle and the error will reappear. Resolve the root cause before relying on a reset.
How much does it cost to repair a Bosch dishwasher with error E:8101?
If the fix is simply cleaning the sensor or reseating a connector, there may be no parts cost at all, though a service call fee can range from around $75 to $150. If the Aquasensor itself needs replacement, parts and labor together typically range from $100 to $250 depending on the specific model and local labor rates. Control board replacement, if required, would be at the higher end of repair costs.
How do I fix error E:8101 on my Bosch dishwasher?
Start by checking whether your model actually includes an Aquasensor. If it does, inspect the sensor for grease or limescale buildup and clean the lens gently with a soft cloth. Next, examine the wiring harness and connector for damage or loose pins. If the sensor is clean and the wiring is intact but the code persists, the sensor itself may need to be replaced.
Is it safe to run my Bosch dishwasher with error E:8101 showing?
The E:8101 fault is not a water leak or electrical safety hazard, but running the dishwasher while the Aquasensor is faulted means the machine cannot optimize its cycle based on water clarity. This may result in less efficient cleaning or higher water usage. It is best to diagnose and correct the fault before continued use.

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