5Troubleshooting DBW 2010 / 2016
506
5.4.3 Heater does not start until after several starting attempts
5.4.4 Heater goes out by itself during operation
no
yes
Does smoke exit from the
exhaust pipe during the
failed starting attempts?
no Fuel level has dropped
while heater was
stopped:
Press off intake and re-
turn line.
Can leaks be found?
Fuel pump defective;
replace.
Pressure control valve
clogged.
no
See 5.4.7 Seal off.
Does the ignition
spark jump across at
the high-voltage
lines?
Does the ignition spark
jump across at the insula-
tion of the ignition elec-
trodes?
Ignition spark genera-
tor defective; replace.
High-voltage line de-
fective
Ignition electrode defec-
tive; replace.
no
yes
Does the heater function after
repeating the starting at-
tempt?
Does the heater react at all? See 5.4.1
Fuel supply from tank was in-
terrupted for a longer time.
Heater goes into fault mode
after approx. 30 s (with
1563/1564 control unit:
24 s). See 5.4.2
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