Miele Dishwasher Fault Code F78 Meaning and Possible Fixes
Miele Dishwasher Fault Code F78
If your Miele dishwasher displays fault code F78, the appliance has detected a circulation pump fault. In some cases this can be resolved by the user, particularly if the machine has been unused for an extended period.
View all Miele dishwasher fault codes
What the F78 Fault Code Means
The F78 fault code indicates a fault with the circulation pump. Miele specifically notes that in longer breaks between wash cycles — lasting weeks or months — or when using the dishwasher for the first time, the pump can become dry and the impeller components can stick together. This prevents the pump from spinning freely when the machine starts and triggers F78. Miele provides a specific user remedy involving rinse aid solution to free the pump.
Common Reasons This Fault Appears
Pump dry or stuck after a period of inactivity
If the dishwasher has not been used for several weeks or months, the circulation pump seals can dry out and the impeller can become stuck. This is the most common cause of F78 and can be resolved by the user.
First use of a new appliance
A brand new dishwasher can occasionally display F78 if the pump components have dried during storage or transit.
Worn or failing circulation pump
In older machines, genuine mechanical wear can cause the circulation pump to fail and trigger this code.
Foreign object in the pump
Debris lodged in the pump impeller can prevent it from spinning and produce this fault code.
Safe Checks You Can Try
Miele provides a specific remedy for F78 when caused by the pump drying out:
Apply rinse aid solution to free the pump
Remove the lower spray arm and the filter combination. Pour a small amount of warm water with a few drops of rinse aid into the sump area at the base of the wash cabinet. Leave it to soak for several minutes — this helps lubricate and free the pump impeller. Refit the filter combination and spray arm, then restart the machine.
Run a short programme
After applying the rinse aid solution, run a short programme to see if the pump frees up and operates normally.
Restart the dishwasher
If the fault appeared after a power interruption or as a temporary glitch, switch the machine off at the mains for a few minutes, then switch back on and restart.
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
If the F78 fault persists after applying the rinse aid solution and running a programme, the circulation pump may have failed mechanically and will need to be replaced by a qualified engineer.
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 F70 and Miele Dishwasher Fault Code F79.
Fault codes may vary slightly between different Miele dishwasher models, so always consult the manufacturer documentation for your specific appliance.
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