Miele Dishwasher Fault Code F91 Meaning and Possible Fixes

Miele Dishwasher Fault Code F91

If your Miele dishwasher displays fault code F91, the appliance has detected a load size registration fault that cannot be resolved without professional assistance.

View all Miele dishwasher fault codes

What the F91 Fault Code Means

The F91 fault code indicates that the load size registration system is inactive. Some Miele dishwashers automatically adjust water usage based on how much crockery is loaded. When the system responsible for detecting or registering the load size fails, F91 is displayed. Miele confirms this is a technical fault that cannot be remedied by the user.

Common Reasons This Fault Appears

Load size sensor fault
The sensor or system that monitors the weight or size of the load may have failed, preventing the machine from registering this data.

Control board fault
An issue with the main electronic control module can affect the load size registration system and trigger this fault.

Wiring fault
A loose or damaged electrical connection within the load sensing circuit can cause this fault to appear.

Safe Checks You Can Try

Restart the dishwasher
Switch the machine off at the mains and leave it unplugged for a few minutes. Reconnect the power, switch back on and restart the programme. A power reset can sometimes clear a temporary fault.

Miele advises that if the fault persists after a reset, the appliance cannot be repaired without professional assistance.

If You Need Spare Parts

If you are confident carrying out the repair yourself, compatible Miele dishwasher parts are available on Amazon with next day delivery.

Always check your model number before ordering to ensure compatibility.

When To Contact A Professional

Miele advises that fault F91 is a technical fault that cannot be resolved without professional assistance. An engineer will need to diagnose and repair the load size registration system.

Internal components should only be inspected or repaired by trained professionals.

Related Miele Dishwasher Fault Codes

You may also encounter related issues indicated by Miele Dishwasher Fault Code F88 and Miele Dishwasher Fault Code F170.

Fault codes may vary slightly between different Miele dishwasher models, so always consult the manufacturer documentation for your specific appliance.

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