Webasto Air Top Evo 3900 Workshop Manual page 10

Introduction
If any damage or leaks are found on the fuel line, the heater
must not be used until the damage has been rectified by an
authorised Webasto workshop.
Put the heater out of action by removing the fuse.
Overheating
Keep the hot air inlet and hot air outlet free of dirt and for-
eign bodies. Dirty, blocked air lines can cause the heater to
shut down due to overheating.
After an overheating lock-out, check that the air system is
clear, remove any materials that may block the air current
and have any damage to the air lines repaired by an author-
ised Webasto workshop. After this the heater lockout can
be cancelled by switching it off and then on again. If this ac-
tion does not produce the required success (if the heater
overheats again) take it to a Webasto-authorised workshop.
The air outlet jets or air vents with adjustable flaps must al-
ways be opened to some extent so that the air current
through the heater is not completely blocked. At least one
air vent must be non-closable.
If the heater is installed in a storage area, you must ensure
that no inflammable substances are kept in this area and
that other material does not restrict the air supply to the
heater.
Air lines must be securely fixed to the heater (using pipe
clips, for example) and all other connection points (for ex-
ample vents).
IMPORTANT
The errors described below are to be avoided at all costs:
• Do not stand on the heater and do not place any heavy
items on the heater or throw items at the heater.
• Do not place any items of clothing, textiles or similar
materials over the heater or in front of the hot air inlet
and the hot air outlet.
• The current of hot air in the heater must not be restrict-
ed or blocked by highly inflammable substances or ma-
terials such as rags, cleaning wool, etc.
• Inflammable or explosive substances and gases must
not be placed near or in contact with the heater, the hot
air line, the current of hot air or the exhaust pipe.
• The heater must not be cleaned with a high pressure
cleaner.
• Do not switch the heater off at the main battery switch
or battery isolation switch since otherwise it is possible
that it may suffer long term damage if it is switched off
frequently using the battery isolation switch and this
can cause damage and negative influences on the func-
tion of the heater.
104
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NOTE
Failure to follow the installation instructions and the notes
contained therein will lead to all liability being refused by
Webasto. The same applies if repairs are carried out incor-
rectly or with the use of parts other than genuine spare
parts. This will result in the invalidation of the type approval
for the heater and therefore of its homologation / EC type
licence.
You must read the operating manual before starting the
heater for the first time.
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Air Top Evo 3900/5500
NOTE