Miele Dishwasher Error Code F84, F85, F86, F87 and F88

The quality of the water entering your Miele dishwasher plays a pivotal role in its cleaning effectiveness. The balance between mineral content and water purity is crucial for spotless dishwashing. Hard water can lead to unsightly streaks on your glassware, but when the water is excessively hard, surpassing the permissible parts per million (PPM) of minerals, it can trigger your dishwasher to halt its operations.

If the water quality entering your dishwasher isn’t properly addressed, it can lead to irreparable damage to the water quality sensor, indicated by error codes such as F84, F85, F86, F87, and F88.

Check the Water Quality Sensor

The water quality sensor within your Miele dishwasher is responsible for monitoring the mineral ion concentration in the incoming water and measuring the detergent’s mixing ratio with fresh water for optimal cleaning. When this sensor becomes damaged, it can disrupt the dishwashing process. Here’s how to address it:

1. Inspect the Water Quality Sensor: Begin by opening the dishwasher to access the sensor. It is typically located near the bottom of the machine. Carefully inspect it for any visible damage or signs of wear.
2. Resistance Test with a Multimeter: To confirm the sensor’s functionality, perform a resistance test using a multimeter. Follow your appliance’s manual for the specific resistance values that indicate whether the sensor is working correctly.
3. Replacement, If Necessary: If the sensor shows signs of damage or the resistance test indicates a malfunction, it’s time to replace the sensor. Obtain a compatible replacement part, ensuring it matches the model of your Miele dishwasher.

Addressing the water quality sensor issue promptly is crucial to ensure that your Miele dishwasher continues to deliver impeccable results. When in doubt or if the problem persists, don’t hesitate to contact a professional appliance repair service.