Miele H6800BM Operating And Installation Instructions page 13

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When using residual heat to keep food in the oven warm, the high
humidity and amount of condensation in the oven can cause
corrosion in the oven. The control panel, the worktop or the housing
unit can also suffer damage.
Always cover food when using Microwave solo  function. Once
food is cooked through, use a lower power for continued cooking to
reduce the amount of steam produced from the food.
When using residual heat do not switch the oven off. Instead set the
temperature to the lowest setting and leave the oven on the selected
function. The fan will then remain on automatically and dissipate the
moisture.
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Food which is stored in the oven or left in it to be kept warm can
dry out and the moisture released can lead to corrosion damage in
the oven.
Always cover food that is left in the oven to keep warm.
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A build-up of heat can cause damage to the enamel on the floor
of the oven.
When using Conventional heat , Bottom heat , Intensive
bake  or Fan plus  do not line the floor of the oven with
anything, e.g. aluminium foil or so-called protective liners. Neither
should you place roasting pans or glass trays directly on the oven
floor.
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It is important that the heat is allowed to spread evenly
throughout the food being cooked and that it is hot enough.
This can be achieved by stirring and/or turning the food, and
observing a sufficiently long standing time, which should be added
to the time needed for cooking, reheating or defrosting.
Warning and Safety instructions
13