Webasto DBW 2010 Service And Repair Manual

www.webasto.us 27 Webasto Product N.A., Inc.
DBW 2010/2020/300 COOLANT HEATERS TROUBLESHOOTING
5.3.3 AFTER SWITCHING ON, THE HEATER SWITCHES OFF AFTER APPROX. 30 SECONDS ON FAULT
Y
ES
NO
Overheat fuse
opened? Has
temperature limiter
(green wires)
opened?
Can you detect the
buzzing sound of
the ignition coil
after approx.
20 seconds?
Voltage across
terminal
C8 and C5?
Check feed
connections of
control unit for
open or
interruption
Is there the same
effect with a new
ignition spark coil?
Insulator of
electrode defective
Remove intruption or
open in circuit
Ignition spark coil
defective
Remove cause for
release, e.g. lack
of coolant; replace
overheat fuse or
allow temp.
limiter to reset.
Does flame
detector show
resistance >100 kȍ
when dark?
Flame detector
defective
Control unit defective
Is combustion
noise audible?
Is fuel splashing
out of the fuel
nozzle?
Does the fuel
solenoid valve
in the heater open?
Magnetic coil of
fuel solenoid valve
defective
Does fuel nozzle
produce good fuel
atomization?
Volume on
solenoid valve?
Fuel solenoid valve
defective
Voltage on
solenoid valve?
Check feed
connections
Are ignition
electrodes correctly
set with gauge?
Adjust ignition
electrodes to
correct setting
with gauge
Fuel in the tank? Refill fuel tank
Are all fuel lines
tightly connected?
Does the pump
deliver fuel?
Fuel nozzle is
blocked, replace
nozzle
Tighten lines, repair
leaks or replace
leaking gaskets
Is the gasket
surface of the fuel
valve piston or of
the air relief drill
hole dirty?
Remove fuel
pump; is the
shaft seal okay?
Clean or replace Fuel suction line
blocked or fuel
waxing or water
in fuel freezing
or fuel tank vent
blocked
Fuel quality or
grade not
appropriate for
cold weather
operation. Switch
to a winter grade.
Replace fuel
pump
Viscosity below
20 centiStokes?
Fuel nozzle is
blocked, replace?
Check air intake
and exhaust outlet
for blockage. Clean
if necessary
Flame detctor
defective, replace
Does the fuel
solenoid valve
in the heater open?
Does flame
detector show
resistance >1.56 kȍ
under bright 50 Lux
light?
Magnetic coil of
fuel solenoid valve
defective

Webasto DBW 2010 Specifications

General

Brand	Webasto
Model	DBW 2010
Category	Water Heater
Language	English