Miele DGC 6800 Operating And Installation Instructions page 11

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While the appliance is under guarantee, repairs should only be
undertaken by a Miele authorised service technician. Otherwise the
guarantee is invalidated.
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Miele can only guarantee the safety of the appliance when
genuine original Miele replacement parts are used. Faulty
components must only be replaced by Miele spare parts.
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If the plug is removed from the connection cable or if the
appliance is supplied without a plug, the appliance must be
connected to the electrical supply by a suitably qualified electrician.
If the cable is damaged it must be replaced with the correct cable
by a Miele authorised technician only. See "Electrical connection" for
more information.
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During installation, maintenance and repair work, the appliance
must be disconnected from the mains electricity supply.
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In countries where there are areas which may be subject to
infestation by cockroaches or other vermin, pay particular attention
to keeping the appliance and its surroundings in a clean condition at
all times. Any damage caused by cockroaches or other vermin will
not be covered by the guarantee.
Warning and Safety instructions
11