Miele Dishwasher Error Code F52

F52 means the heater pressure switch tripped and then reset itself during a heating phase in the wash cycle. Because the switch recovered, the dishwasher finished the program but did so without the heater being active. This fault does not appear on the display during normal use and is only visible when the fault memory is read in service mode. It most commonly points to excess foam from too much detergent or rinse aid.

The dishwasher can complete cycles with this fault present, but it does so without full heater operation during the affected phase, which means water temperatures may not reach the level needed for proper cleaning and sanitization. Continuing to run the machine without addressing the root cause can lead to repeated occurrences. It is best to diagnose and resolve the fault before relying on the dishwasher for regular use.

If the fix is simply adjusting detergent quantities or switching to a different product, there is no parts cost involved. If the heater pressure switch needs to be replaced, parts and labor costs can range from around 100 dollars to 300 dollars or more depending on your location and the service provider. Wiring repairs or tube replacements generally fall on the lower end of that range.

Start by reducing the amount of detergent and rinse aid you are using, and confirm you are using a product specifically formulated for automatic dishwashers. If the fault continues to appear in the fault memory after correcting foam-related issues, a technician should inspect the pressure switch, its sensing tube, and the associated wiring for faults. In some cases the pressure switch will need to be replaced.

Resetting the dishwasher will not permanently clear F52 if the underlying cause is still present. The fault is stored in the service mode fault memory and will reappear the next time the pressure switch trips during heating. The fault memory should be cleared by a technician after the root cause has been identified and corrected.