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Error code reference

Miele Dishwasher Error Code F88

Turbidity sensor fault; false or no values from turbidity sensor

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What the F88 error code actually means

The F88 code means your Miele dishwasher's water-clarity sensor is not working correctly and the machine could not get useful readings from it during a recent cycle. Your dishes were still washed, but the dishwasher had to use basic default settings instead of automatically adjusting the cycle based on how dirty the water was. You would not have seen this message on the display during the wash; it only shows up when a technician checks the internal fault log.

Diagnostic procedure

The full F88 procedure

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First diagnostic step
Check the turbidity sensor for correct function.
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Most common causes of F88

Ranked by how often they cause this code
  1. 1Contaminated or fouled sensor lens
  2. 2Faulty turbidity sensor
  3. 3Wiring or connector fault
  4. 4Control board failure

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Questions people ask about F88

What does F88 mean on a Miele dishwasher?
F88 indicates a turbidity sensor fault, meaning the dishwasher received false or no readings from the sensor that monitors how dirty the wash water is during a cycle. The machine continues running using built-in default settings rather than adjusting automatically based on water clarity. This code is only stored in the internal fault memory and is not shown on the display during normal use.
Will resetting my Miele dishwasher clear the F88 fault code?
A reset may clear the fault from the active display, but if the underlying sensor problem has not been corrected, the fault will be logged again during the next cycle. The proper resolution is to diagnose and repair the turbidity sensor or its wiring before clearing the fault memory.
How much does it cost to fix a Miele dishwasher F88 error?
Repair costs vary depending on the root cause. If the fault is caused by a dirty sensor lens, cleaning it costs nothing beyond a service call, which typically ranges from around 80 to 150 dollars. If the turbidity sensor itself needs replacement, parts and labor combined can range from approximately 150 to 350 dollars depending on your location and the technician's rates.
Can I still use my Miele dishwasher when F88 is stored in the fault memory?
Yes, the dishwasher will continue to operate normally when F88 is logged. The machine simply runs on fixed default program settings instead of optimizing the cycle dynamically. However, you should have the sensor inspected and serviced to restore full adaptive functionality and efficiency.
Is F88 a safety concern on a Miele dishwasher?
F88 is not a safety-related fault and does not indicate any risk of water leakage, electrical hazard, or damage to the appliance. The dishwasher is designed to continue running safely on default settings when this fault occurs. That said, leaving the fault unaddressed means the machine is not cleaning or using water as efficiently as it should.

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