Warning:
The heater must be switched off while
any fuel tank on the vehicle is being
filled.The heater must not be operated
in garages or enclosed areas.
16
Heater Operation
• When the heater is switched off, manually or
automatically, it starts a controlled cool down cycle.
• The fuel metering pump stops delivering fuel and the
flame goes out.
• The combustion air blower andwater pump continue to
run for 3minutes to cool down.
• The heater shuts off.
The control unit, temperature sensor, overheat sensor and
flame sensor continuallymonitor heater functions andwill
shut down the heater in case of amalfunction.
• The control unit ensures electrical circuits (fuel pump,
combustion air blower etc.) are complete prior to starting
the heater.
• If the heater fails to ignitewithin 90 seconds of the fuel
pump being started, the starting procedurewill be
repeated. If the heater again fails to ignite after 90
seconds of fuel being pumped, a “no start safety
shutdown” follows. (Fault #52)
• If the heater flames out during operation, the heater
automatically attempts to restart. If the heater fails to
ignitewithin 90 seconds of fuel delivery, the heater will
turn off the fuel pump and complete a cool down and dis-
play a F052 code. After troubleshooting the problem the
heater can be started again by switching the heater off
and then back on again.
• Overheating due to lack of water, a restriction or a poorly
bled coolant system results in the overheat shutdown
(F012). Fuel delivery will cease and an “overheat shut
down” follows. If heater overheats 3 consecutive times, a
lockout on the control unit will occur.To unlock the control
unit youwill need to use the Fault CodeRetrieval Device.
See following pages for self diagnostics.
• If at any time the voltage drops below 10.5V for 20 sec-
onds, or rises above 16.0V for 20 seconds the heater will
shut down and display the associated Fault Code.
SwitchingOff
SafetyEquipment
