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138 UNDERSTANDING YOUR INSTRUMENT PANEL
AUXILIARY HEATER – TIPS FOR COPING WITH
PROBLEMS
NOTE: After three successive attempts to start the
heater, a malfunction will be recorded in the integrated
diagnostic system and no further operation on
auxiliary heater will be available (lock-out). The work
to annul the lock-out must be carried out at an
authorized Sprinter Dealer.
The heater either does not switch on or automatically
switches off:
• Insufficient fuel, fill up the fuel tank. Start up heater
two times, until the fuel lines are filled.
• The auxiliary heater will automatically switch off if
the fuel level is under about 4 US gal (15 l).
• The fuses in the fuse box are damaged. Electric
fuses.
• The battery voltage is too low, an undervoltage
protector switches off the heater if the battery
voltage falls below about 10 volts.
The heater motor does not run
• The battery voltage is too low, check the battery.
Batteries.
• The fuses in the fuse box are damaged.
Electric fuses.
• The heater motor is damaged.
Overheating
• The air channels are clogged.
The heater can be restarted once the fault has been
repaired. When this is done, the heater should be
switched on and off.
• The heater will remain switched off after it has been
overheated a number of times (about 10 times in
succession). Have the fault repaired by an
authorized Sprinter Dealer.
NOTE: Repairs should only be made by an authorized
Sprinter Dealer.