Mercedes-Benz S-Class 2020 Owner's Manual page 199

196 Climate control
Possible cause:
The fuel tank is not sufficiently filled.
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Refuel at the nearest filling station.
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FAIL ¯ ¯ appears on the remote control dis‐
play
Possible cause:
There is a malfunction in the stationary
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heater.
Have the stationary heater checked at a
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qualified specialist workshop.
Air vents
Adjusting the front air vents
& WARNING Risk of burns and frostbite
due to being too close to the air vents
Very hot or very cold air can flow from the air
vents.
Make sure that all vehicle occupants
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always maintain a sufficient distance
from the air vents.
If necessary, direct the airflow to
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another area of the vehicle interior.
To guarantee the flow of fresh air through the air
vents into the vehicle interior, comply with the
following:
Always keep the vents and vent grilles in the
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vehicle interior free.
Keep the air inlet free of residue build-up
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( page 364).
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To open the centre and side air vents:
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press button 1.
The three indicator lamps on the button will
light up. The air vents will be opened com‐
pletely.