Webasto Thermo Top Z Shop Manual page 21

Thermo Top E and Z/C
5 Troubleshooting
5.1 General Fault Symptoms
The following table (Fig. 501) lists possible fault
symptoms of general nature for heaters in installed
condition.
CAUTION
Troubleshooting requires profound knowledge about
components and their theory of operation and may only be
performed by trained personnel.
In case of doubt functional interrelations may be derived
from Sections 2 and 3.
Symptom
Smell of fuel
Heater does not achieve full load operation
Continuous white smoke during combustion operation
Heater cannot be switched off
Loss of coolant (dripping);
heater develops smoke during combustion operation;
smell of exhaust fumes extremely sweet
Loss of fuel (dripping)
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Fig. 501 Fault Symptoms
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CAUTION
Troubleshooting is normally limited to the isolation of
defective components and provides information on
defective wiring and connections.
The following possible causes for trouble have not been
taken into consideration and must always be excluded as
a possible cause for malfunctions:
corrosion on connectors
loose contacts on connectors
wrong crimping on connectors
corrosion on wiring and fuses
corrosion on battery terminals
After any fault correction a functional checkout in the
vehicle has to be performed (see 6.2).
Remedy
Check heater system integration in vehicle's fuel system.
Check fuel lines for leakage, kinks or obstructions. If o.k.
there is a heater internal leak. Remove heater and
perform troubleshooting on repair shop level.
Remove heater and perform troubleshooting on repair
shop level.
Remove heater and perform troubleshooting on repair
shop level.
Perform functional test of Timer (see 6.2.2) or of
Telestart device (see 6.2.3). Replace or repair defective
component.
Inspect coolant hoses for leakage, kinks, loose hose
clamps, etc.
If o.k. there is a heater internal leak.
Remove heater and perform troubleshooting on repair
shop level.
Check heater system integration in vehicle's fuel system.
Check fuel line connections for leakage. If o.k. there is a
heater internal leak.
Remove heater and perform troubleshooting on repair
shop level.
5 Troubleshooting
501