Operation With The Timer - Mercedes-Benz Sprinter Operating Instructions Manual

Operating the auxiliary heating system
122
Problem
The hot-water auxiliary
heater has overheated.
Auxiliary warm-air heater

Operation with the timer

Important safety notes
G
DANGER
If a switch-on time has been selected, the
auxiliary heating switches on automatically.
If the ventilation is insufficient, poisonous
R
exhaust gases can collect, in particular car-
bon monoxide. This is the case in enclosed
spaces, for example. There is a risk of fatal
injuries.
If highly flammable substances or flamma-
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ble materials are nearby, there is a risk of a
risk of fire and explosion.
Always deactivate the preselected switch-on
times if you stop the vehicle in such or similar
situations.
Possible causes/consequences and M Solutions
The low-voltage protection system integrated in the control unit
switches off the auxiliary heating because the on-board voltage is less
than 10 V.
X
Have the alternator and battery checked.
or
The fuse is blown.
X
Replace the fuse; see the "Fuse allocation" supplement.
X
Have the cause of the blown fuse determined at a qualified spe-
cialist workshop.
or
A malfunction has occurred.
X
Switch the ignition on and off twice.
If the auxiliary heating still cannot be switched on, the heating device
is faulty.
X
Have the auxiliary heating checked at a qualified specialist work-
shop.
The coolant level is too low.
X
Check the coolant level and top up if necessary (
Use the timer to:
activate and deactivate immediate heating
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mode
set up to three switch-on times
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set the operating duration to a range between
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10 and 120 minutes or to continuous opera-
tion
set the heating level (preselected tempera-
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ture) to a range between 10 and 30
Y
page 245).