Eberspächer AIRTRONIC D2 Operating Instructions And Service Book - Controls and Safety Devices
Page 20
Airtronic D2 / D4 / D4+
If the Airtronic does not ignite within
90 seconds after the fuel pump has started,
then the start is repeated in the manner
described. A malfunction cut-off is effected
if after a further 90 seconds of fuel pumping
the Airtronic once again fails to ignite, i.e.
fuel pump switches off and the blower motor
continues to run for approx. 240 seconds.
If the flame extinguishes by itself during
operation, a renewed start is carried out first.
If the Airtronic fails to ignite within 90 seconds
after fuel pumping has started again or if it
does ignite but then extinguishes itself within
the next 15 minutes, a malfunction cut-off is
effected, i.e. fuel pump switches off and the
blower motor continues to run for approx.
240 seconds.
It is possible to override a malfunction cut-
off by briefly switching the heater off and on
again. Do not repeat this more than twice in
succession.
In the case of over-heating, the combi-sensor
will respond, the fuel supply will be interrupted
and a malfunction cut-off will be effected.
Once the cause of overheating has been
eliminated, the Airtronic can be restarted by
briefly switching it off and on again.
If the upper or lower voltage limit is reached,
a malfunction cut-off is effected after
20 seconds.
The Airtronic will not start if the glow pin or
blower motor is defective or if the electrical line
to the fuel pump is interrupted.
In the case of defective temperature-sensor
or interruption in the electric wire, the Airtronic
does not start and the malfunction shutdown
then takes place.
Controls and Safety Devices
The speed of the fan motor is continuously
monitored. If the fan motor does not start
or if the speed deviates by more than
10%, a malfunction cut-off is effected after
30 seconds.
When switching off the Airtronic, the glow pin
is switched on for 40 seconds while the fan
motor is running to clean it of any combustion
residues.
In the Event of Malfunction, Check the
Following Points
If the Airtronic does not start when it is
switched on:
Switch off the Airtronic and then switch it
back on again, but no more than twice in
succession.
If the Airtronic still does not start, then check:
Is there fuel in the tank?
Have any fuses blown?
Airtronic 12 V - main fuse 20 A;
Airtronic 24 V - main fuse 10 A;
Airtronic 12/24 V - control fuse 5 A.
Are all electric wires and connections ok?
Are the heating-air duct, combustion air hose
or the exhaust-gas tube blocked?
If the Airtronic unintentionally remains in
‘ventilating’ mode after it is switched on, the
control element has to be checked for a short
circuit.
If these points are OK, then proceed with a
diagnosis test using the JE diagnosis unit
or either the 701 or 801 controller, which
incorporates fault code display.