no
yes
Is the combustion-air intake
pipe or the exhaust connec-
tion piece soiled?
no
Are the gas paths of
the heat exchanger
heavily soiled?
Does vacuum or gauge
pressure result at the
combustion air inlet,
possibly also while driv-
ing?
Motor speed (see Sec-
tion 6) too low.
no
Clean, correct installation if
necessary (see Section 8).
Clean according to
specifications.
Is the swirl chamber
(with DBW 2010) defec-
tive?
Is the burner protection
flap/are grommets
leaky?
no
Does the heater emit black
smoke only during starting?
Has the air control be-
come misadjusted?
Are there constric-
tions or throttled posi-
tions in the fuel return
line or is the intake
line leaky or heated up
(formation of bub-
bles)?
Has the correct fuel
been used according to
the table in the operat-
ing manual?
Observe information
in operating manual.
Allow heater to
burn clear.
Check fuel pump pres-
sure (see Section 6). Is
the pump pressure too
high?
Is the voltage at the
motor below 10 V or
20 V under load?
Due to the increased
fuel pressure, the flow
rate of the atomiser
nozzle is too high.
Set (see Section 6). Charge battery;
electrical lines corrod-
ed or too small;
motor defective.
Is the valve seat of the sole-
noid valve leaky?
(seat damaged, armature
jams).
Can the permissible
combustion values
(see Section 4) be set?
Distance between fan
impeller and housing
too large (for DBW
2010/2012) or motor
speed insufficient (see
Section 6).
Replace atomiser noz-
zle.
no
Check valve seat and replace
small parts of solenoid valve
if necessary.
Does the heater con-
tinue to emit black
smoke after setting?
Does the atomiser
nozzle spray uniform-
ly?
Clean or replace atom-
iser nozzle.
To Next Page
Loading...
Need help?
General
