LG EA780SP Operating Instructions Manual page 17

4. The baking tray and Wire
grille should be positioned
accurately on the upright pins
of the telescopic runners. An
unstable coupling between
the baking tray and the
telescopic runners may
cause the trays to drop or
food to fall onto the oven
floor.
Warning: You should not do self-cleaning with these telescopic
runners and other all accessories in the oven.
Because self-cleaning is performed at high
temperature (about 500°C), the telescopic runners and
utensils may become distorted and become
unuseable.
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