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Error code reference

Miele Dishwasher Error Code F19

Flow meter B3/4 stiff and not turning freely

Miele codesMiele dishwasher codes

Flow meter B3/4 stiff and not turning freely — satisfactory test routines to monitor free rotation of the flow meter impeller could not be established.

First step from the service manual

Replace the water diverter (Section 050-4.10).

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What F19 means on a Miele dishwasher

The F19 error code on a Miele dishwasher indicates that the flow meter, designated B3/4, has a stiff or seized impeller that is not rotating freely. The flow meter is a critical component in the water distribution system. It monitors the movement and volume of water as it is directed through the dishwasher's wash circuits. The control system runs test routines to confirm that the impeller spins freely during operation, and when those routines cannot be successfully completed, F19 is triggered to alert the technician to a mechanical fault at the meter.

The flow meter B3/4 is closely integrated with the water diverter assembly, which is why the first recommended diagnostic action is replacement of the water diverter. The diverter controls which wash zone receives water at any given point in the cycle, and when it seizes or degrades mechanically, it can directly impede the rotation of the flow meter impeller. Mineral scale buildup, debris contamination, or wear within the diverter mechanism are the most common contributors to this condition.

Because the dishwasher cannot verify proper water routing without a freely spinning flow meter, it will halt operation to prevent incomplete wash cycles or potential overfill situations. Simply resetting the machine will not address the underlying mechanical fault. The diverter assembly must be inspected and replaced as needed, after which the flow meter impeller should be confirmed to rotate without resistance before returning the unit to service.

Source: manufacturer service documentation.

Common causes of F19

  1. 01

    Seized or damaged water diverter

    Part replacement

    The water diverter assembly is the primary suspect for F19. Mechanical wear, warping, or internal breakage can cause the diverter to bind, which directly prevents the flow meter impeller from rotating freely.

  2. 02

    Mineral scale or limescale buildup

    Wiring / connection

    Hard water deposits can accumulate around the flow meter impeller and within the diverter mechanism, restricting movement. This is more common in areas with high water hardness and in machines that have not been descaled regularly.

  3. 03

    Debris or foreign object obstruction

    Wiring / connection

    Small food particles, broken glass, or other debris can enter the flow meter housing and jam the impeller. Inspecting the meter for visible obstructions is part of a thorough diagnosis.

  4. 04

    Worn or degraded flow meter impeller

    Part replacement

    Over time, the impeller itself can crack, warp, or lose blades, causing it to catch or stop mid-rotation. Physical inspection of the impeller will reveal this condition.

  5. 05

    Failed flow meter B3/4 assembly

    Part replacement

    If the diverter has been replaced and the impeller is clear of obstructions and scale, the flow meter unit itself may be faulty and require replacement.

See the test procedure for each cause

Frequently asked questions about F19

What does F19 mean on a Miele dishwasher?
F19 means the dishwasher's control system detected that the flow meter impeller, identified as component B3/4, is stiff and not rotating freely. The machine runs internal test routines to confirm the impeller moves without restriction, and when those tests fail, F19 is displayed. The error points to a mechanical fault in the flow meter or the associated water diverter assembly. The first recommended step is to replace the water diverter.
Can I fix the F19 error myself?
A knowledgeable DIYer may be able to address F19 by inspecting and clearing debris or scale from the flow meter area, but the primary fix involves replacing the water diverter assembly, which requires disassembling internal components. If you are not comfortable working inside the dishwasher's wash system, a qualified appliance technician should handle the repair. Attempting the repair without proper disassembly skills risks damaging other components.
Is it safe to keep using my dishwasher with an F19 error?
It is not recommended to continue running the dishwasher while F19 is active. Because the machine cannot verify proper water distribution, cycles may be incomplete, leaving dishes unwashed or potentially causing water to be misdirected internally. The dishwasher typically halts operation when this code appears to prevent these issues.
Will resetting the dishwasher clear the F19 error?
A reset will not permanently clear F19 because the error is caused by a physical mechanical fault, not a temporary software or sensor glitch. The control system will re-run its flow meter test routines at the start of the next cycle and trigger the code again if the impeller is still restricted. The underlying cause, most commonly the water diverter, must be repaired or replaced to resolve the error.
How much does it cost to repair an F19 error on a Miele dishwasher?
Repair costs depend on whether you hire a technician or do the work yourself. A professional repair including parts and labor typically ranges from $150 to $350, depending on your location and service rates. If you source the water diverter part yourself and complete the repair independently, parts alone generally range from $40 to $100. Miele is a premium appliance brand, so both parts and labor can sit toward the higher end of appliance repair pricing.

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