Miele Dishwasher Error Code F33

F33 indicates that the door lock did not open within the required time period. Specifically, it means the adjustable latch on the comfort door closing aid system (used on LaPerla II models) failed to complete its extension or retraction cycle in time. The fault is triggered by the control unit when it does not receive confirmation that the latch has moved as expected. This is typically caused by a loss of supply voltage or a failed door closing aid unit.

You should not continue using the dishwasher while the F33 error is active. The door lock system is not functioning correctly, which means the door may not be securely latched during a cycle. Operating the appliance in this condition could pose a risk of the door opening during operation or water leaking out.

A reset may temporarily clear the fault display, but if the underlying problem with the door lock or its power supply has not been resolved, the F33 error will return. The fault is triggered by a real mechanical or electrical condition, so a reset alone is not a fix. The comfort door closing aid and its power supply need to be inspected and corrected for the error to clear permanently.

Some basic checks are within reach of a confident DIYer, such as inspecting the door latch area for obstructions and checking that the unit is properly receiving power. However, testing supply voltage at the comfort door closing aid requires a multimeter and some electrical knowledge. If the component itself needs to be replaced, that repair is more involved and may be better handled by a qualified appliance technician.

Repair costs depend on the root cause. If only wiring or a connector needs attention, costs may be relatively low, typically in the range of a service call fee plus labor. If the comfort door closing aid unit needs to be replaced, parts plus labor on a Miele appliance can range from around $150 to $400 or more depending on your location and the technician's rates.