You will find very little Miele info online.
F79 signals a communication fault between the circulation motor frequency converter and control module.
Basically all you can do is check that the wiring between the circulation motor & pcb is intact (no broken wires/bad contacts). If ok then you need either a new circulation motor or a new pcb. Miele spares are very expensive, so rather than guessing which one to change out I would get a Miele tech in to pin it down first time around.
If it is new you shouldn't be messing around with it at all...you risk invalidating your warranty altogether
Line fluctuation/surges can cause all kinds of problems. Keep an eye on it & if you get more error codes call Miele...
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