Miele KM 2014 Operating And Installation Instructions page 17

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If the appliance is installed behind a kitchen furniture door, it may
only be used with the furniture door open.
Only close the door if the appliance is switched off.
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If the appliance has not been used for a long period of time it
should be thoroughly cleaned before it is used again. It is also
advisable to have the appliance tested for safety.
Miele cannot be held liable for damage caused by
non-compliance with these Warning and Safety instructions.
Warning and Safety instructions
17