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Error code reference

Miele Dishwasher Error Code F86

Salt container lid contact fault

Miele codesMiele dishwasher codes

Salt container lid contact fault — the reed switch is constantly open during the monitoring period, indicating the lid is not properly closed or the magnet is missing/defective.

First step from the service manual

Close the salt container lid.

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

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What F86 means on a Miele dishwasher

The F86 error code on a Miele dishwasher indicates a fault with the salt container lid contact system. The dishwasher monitors whether the salt compartment lid is properly closed using a reed switch, which is a magnetically activated electrical switch. Under normal conditions, the magnet embedded in or attached to the salt lid sits close enough to the reed switch to hold it in the closed position during the monitoring period. When F86 appears, the reed switch is reading as constantly open, meaning the control board is not detecting the magnetic field it expects to see.

This fault can have a few root causes. The most straightforward is that the salt container lid is simply not fully seated or tightened. Miele salt compartment lids are threaded and require a firm twist to close completely. If the lid is loose or cross-threaded, the magnet will not align correctly with the reed switch. Beyond improper closure, the magnet itself may be missing or broken, either from a cracked lid or a component that has separated over time. The reed switch itself can also fail, becoming stuck in the open position even when the lid and magnet are intact and properly positioned.

Diagnosing F86 should start with the simplest check: open the dishwasher, locate the salt compartment at the base of the tub, and confirm the lid is fully closed and properly threaded. If the lid appears secure and the error persists, inspect the lid for a missing or damaged magnet. If both the lid and magnet appear intact, the reed switch is the likely culprit and will require component-level testing or replacement by a technician.

Source: manufacturer service documentation.

Common causes of F86

  1. 01

    Salt container lid not fully closed

    Wiring / connection

    The threaded salt compartment lid may be loose, cross-threaded, or only partially tightened. A firm, complete twist of the lid is required to bring the lid magnet close enough to activate the reed switch.

  2. 02

    Missing or damaged lid magnet

    Part replacement

    The magnet that triggers the reed switch is built into or attached to the salt lid. If the lid is cracked or the magnet has separated, the reed switch will remain open even when the lid is physically closed. Inspect the lid closely for visible damage or a missing magnet component.

  3. 03

    Defective reed switch

    Part replacement

    The reed switch inside the dishwasher may have failed in the open position, causing a constant fault signal regardless of lid position. This requires component testing with a multimeter or replacement of the switch.

  4. 04

    Salt lid not compatible or incorrect replacement

    Part replacement

    If the salt compartment lid was recently replaced with a non-Miele or incorrect part, it may not contain the required magnet in the correct position, preventing proper activation of the reed switch.

See the test procedure for each cause

Frequently asked questions about F86

What does F86 mean on a Miele dishwasher?
F86 indicates a salt container lid contact fault. The dishwasher uses a reed switch and a magnet in the salt compartment lid to confirm the lid is properly closed. When the reed switch reads as constantly open during the monitoring period, the control board triggers F86. This can mean the lid is not fully tightened, the magnet is missing or broken, or the reed switch itself has failed.
How do I fix the F86 error on my Miele dishwasher?
Start by opening the dishwasher and firmly tightening the salt compartment lid, making sure it is fully threaded and seated. If the error persists after closing the lid securely, inspect the lid for cracks or a missing magnet. If the lid and magnet look intact, the reed switch inside the machine may need to be tested or replaced by a technician.
Will resetting my Miele dishwasher clear the F86 error?
A reset will not permanently clear F86 if the underlying cause has not been addressed. The dishwasher monitors the salt lid contact during operation, so the fault will return if the lid is still open, the magnet is missing, or the reed switch is defective. Fix the root cause first, then the error should clear on its own or after a reset.
Is it safe to run my Miele dishwasher with an F86 error?
An open salt compartment lid during a wash cycle can allow wash water to enter the salt reservoir, which can dilute or contaminate the softener salt and affect water softening performance. It is best to resolve the F86 fault before running the dishwasher to protect the ion exchange system and avoid long-term issues with hard water deposits.
How much does it cost to repair an F86 error on a Miele dishwasher?
If the fix is simply closing the salt lid correctly, there is no cost involved. Replacing a damaged salt compartment lid typically costs in the range of $15 to $50 for the part. If the reed switch needs replacement, parts and labor combined could range from $100 to $250 depending on your location and the technician's rates.

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