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Error code reference

Bosch Dishwasher Error Code FA

Turbidity sensor fault

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What the FA error code actually means

Your Bosch dishwasher has detected a problem with the sensor that measures how dirty the wash water is during a cycle. Because of this fault, the dishwasher is treating every load as if the dishes are heavily soiled, which can affect how it runs its cleaning programmes. This code is only visible in a special service menu, so a technician typically needs to retrieve it during a diagnostic check.

Diagnostic procedure

The full FA procedure

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1
First diagnostic step
Check: Water quality, filter, turbidity sensor, drain system.
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Most common causes of FA

Ranked by how often they cause this code
  1. 1Contaminated or fouled turbidity sensor lens
  2. 2Clogged or dirty filter assembly
  3. 3Poor incoming water quality
  4. 4Faulty turbidity sensor
  5. 5Drain system not clearing completely

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Questions people ask about FA

What does FA mean on a Bosch dishwasher?
The FA code indicates a turbidity sensor fault. The turbidity sensor measures how dirty the wash water is so the dishwasher can choose the correct automatic programme route. When this fault is active, the machine defaults to assuming the water is heavily soiled. This code only appears in the service menu and is not displayed during normal operation.
Will resetting my Bosch dishwasher clear the FA error?
A basic reset may temporarily clear the fault log, but the FA code will return if the underlying cause has not been resolved. Because this code only appears in the service menu, confirming it has been fully cleared requires re-entering the diagnostic mode after the repair. Addressing the root cause, such as cleaning the sensor or fixing the drain, is necessary for a lasting fix.
How much does it cost to repair the FA error on a Bosch dishwasher?
If the fix involves only cleaning the filter and turbidity sensor lens, costs are minimal and limited to your time. If the turbidity sensor requires replacement, parts and labor combined typically range from around $100 to $250 depending on your location and service rates. More complex issues involving the control board or drain pump would increase that estimate.
Can I fix the FA error on my Bosch dishwasher myself?
Some causes of the FA code are DIY-friendly, particularly cleaning the filter assembly and inspecting the turbidity sensor lens for grease or scale buildup. Checking the drain system for blockages is also straightforward. However, if the sensor itself has failed or there is a wiring issue between the sensor and control board, those repairs are better handled by a qualified technician.
Is it safe to keep using my Bosch dishwasher with the FA error?
The FA fault does not typically create a safety hazard, and the dishwasher will usually continue to operate. However, because the machine defaults to treating every load as heavily soiled, it may run longer or less efficient cycles than necessary. Leaving the underlying issue unresolved can also mask developing problems with the drain or filter system.

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