Problem
Possible causes/consequences and
M
Solutions
The auxiliary heating
switches off.
The interior temperature sensor is faulty. The temperature in the living
area cannot be set.
After switching the auxiliary heating on again, it continuously heats the
living area.
X
Switch the auxiliary heating on again without changing the settings
for the living area.
X
Have the interior temperature sensor checked at a qualified spe-
cialist workshop.
The auxiliary heating
switches off.
Undervoltage. The voltage was lower than 10.5 V for more than 20
seconds.
X
Charge the auxiliary battery (
Y
page 63).
The auxiliary heating
switches off.
G
Risk of accident
The auxiliary heating is overheated. The motor or heating unit is faulty.
If you switch the auxiliary heating on ten times in a row while this fault
is still detected, auxiliary heating operation is disabled.
X
Do not switch on the auxiliary heating.
X
Have the auxiliary heating checked at a qualified specialist work-
shop.
The auxiliary heating
switches off.
G
Risk of accident
Failed starting attempt. There is a lack of fuel, or the motor or heating
unit is faulty.
If you switch the auxiliary heating on ten times in a row while this fault
is still detected, auxiliary heating operation is disabled.
X
If the fuel tank is less than one quarter full - refuel at the next filling
station.
Then, start the auxiliary heating several times until the fuel lines are
full.
X
Have the auxiliary heating checked at a qualified specialist work-
shop.
The auxiliary heating diagnostic interface is faulty. Warning messages
are no longer displayed. Normal operation is possible.
The auxiliary heating control unit monitors all functions.
X
Have the auxiliary heating checked at a qualified specialist work-
shop.
Operation of the auxiliary heating is blocked.
X
Have the auxiliary heating enabled and checked at a qualified spe-
cialist workshop.
50
Auxiliary heating (auxiliary warm-air heater)
Climate control