Miele Dishwasher Error Code F86

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.

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.

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.

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.

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.