Miele Dishwasher Error Code F6

F6 indicates a fault with the heating level switch, which is the safety switch that verifies adequate water is present in the tub before allowing the heating element to activate. When the control board does not receive the correct signal from this switch, it stops the cycle and displays F6. The dishwasher will not heat water while this fault is active.

The dishwasher is designed to halt the heating element when the F6 fault is detected, which reduces the immediate risk of heater damage. However, continuing to run cycles with an active fault can stress other components and may not clean dishes effectively without heat. It is best to have the fault diagnosed and repaired before regular use resumes.

Resetting the dishwasher by canceling the program or cutting power may temporarily clear the displayed code, but it will not resolve the underlying hardware fault. If the heating level switch or its wiring circuit remains faulty, the F6 error will return as soon as the dishwasher attempts the heating phase again. A proper repair addressing the root cause is necessary for a lasting fix.

Some basic checks are within reach for a knowledgeable DIYer, such as inspecting the wiring connectors for corrosion and cleaning visible scale buildup around the switch. However, testing the switch with a multimeter and accessing internal components typically requires disassembly of the dishwasher interior. If the switch or control board needs replacement, a qualified appliance technician is recommended.

Repair costs vary depending on the root cause. If only the wiring needs cleaning or reconnection, costs may be relatively low, primarily covering a technician's diagnostic time. Replacing the heating level switch itself typically falls in the range of $80 to $200 including parts and labor. If the control board is at fault, costs can rise to $300 or more depending on the model and labor rates in your area.