Miele H6800BMX Operating And Installation Instructions page 17

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Do not reheat food in the oven in heat-retaining bags which are
intended for use in normal ovens.
These heat-retaining bags usually contain a thin layer of aluminium
foil which reflects microwaves. This reflected energy can, in turn,
cause the outer paper covering to become so hot that it ignites.
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The oven can suffer damage when using Microwave Solo  or
Microwave combination programmes if it is empty or incorrectly
loaded.
For this reason, please do not use functions with microwave power
to pre-heat crockery or to dry herbs.
Instead use Fan Plus  or Conventional Heat .
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Do not use the appliance to heat up or bottle food in sealed jars
and tins.
Pressure will build up inside them and they can explode causing
damage to the appliance, as well as the risk of injury and scalding.
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Do not leave the oven door open unnecessarily as someone may
trip over it or be injured by it.
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The oven door can support a maximum load of 8 kg. Do not lean
or sit on an open oven door, or place heavy items on it. Also make
sure that nothing can get trapped between the door and the oven
cavity. This could damage the oven.
For ovens with a stainless steel front:
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The coated stainless steel surface can be damaged by adhesives
and will lose its protective effect against pollution. Do not adhere
sticky notes, transparent tape, masking tape or other adhesives onto
the stainless steel surface.
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The surface is susceptible to scratching. Even magnets can cause
scratches.
Warning and Safety instructions
17