DBW 2010 / 2016 Appendix A
A-1
Appendix A
Periodic Heater Maintenance
The heater should be checked at regular intervals, however at
the latest at the start of the heating period (point in time of
weather-dependent increased use of heater).
The maintenance intervals specified in the following refer to
usual applications and requirements at average usage. If the
heater use differs from the average, the intervals can be
shortened or extended accordingly.
Please contact your responsible Webasto partner in corre-
sponding cases.
Test/Maintenance Work Important Notes Test Results Measured Values,
Conducted Repairs
OK Not OK
1. Electrical connections Use suitable contact spray,
e.g. Special Contact Spray
(Order No. 101322).
a) Disconnect plug-in electrical connections to wiring
harness, examine for oxidation, spray and reconnect
after carrying out Point 5.
b) Check electrical fuses for oxidation and/or transfer
resistance.
2. Heat exchanger Determine the cause of
overheating if necessary
(e.g. water circuit);
check temperature limiter.
a) Examine for dark burn spots on paint (local overheat-
ing).
b) Examine for leaks.
c) Clean heater outside and inside.
3. Fuel system Ensure leak-tight connec-
tion in fuel supply and re-
turn line!
Tighten screw fittings and
hose clamps.
Replace pump and lines
every 5 years.
a) Check the fuel lines and connections for leaks.
b) Replace the fuel filter insert with seal.
c) Open fuel shut-off valves if present.
d) Fuel pump and fuel lines.
e) Replace fuel screen with seals in the pump.
4. Burner head
a) Check combustion-air intake opening for clear pas-
sage.
Swing away burner head:
b) Examine housing inside for collections of fuel caused
by leaks.
c) Clean inspection window of flame monitor.
d) Check condition of ignition electrodes. Replace bent electrodes.
In case of coke build-up,
shorten replacement inter-
val for fuel filter.
e) Replace atomiser nozzle.
5. Exhaust system
a) Check exhaust pipe for clear passage and clean if
necessary.
b) Remove combustion chamber from heat exchanger,
examine both parts for damage and soiling and clean
or replace if necessary.
c) Mount combustion chamber and install burner head.
Ensure firm connection to heat exchanger when do-
ing so.
d) Reconnect electrical plug-in contacts.
6. Water system
a) Clean water-filter insert if present.
b) Open water shut-off valves if present.
7. Operating check
a) Open shut-off valve in return line if present.
b) Check heater operation. After at least 10 min. Heat-
ing mode.
c) Watch for smoke in run-on; replace nozzle if neces-
sary.
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