5. Troubleshooting
5.1 General
A malfunction of the Air Top 2000 S is indicated by an
error code displayed on the combination or standard
timer. When equipped with a standard control dial
the operating indicator flashes. In addition a heater check
out may be performed using a personal computer (refer
to operating instructions PC air heater diagnosis).
CAUTION
Troubleshooting requires profound knowledge about
structure and theory of operation of heater components
and may only be performed by skilled personnel.
In cases of doubt refer to Sections 2 or 3 for functional
interrelations.
CAUTION
Troubleshooting is normally limited to the isolation of
defective components.
The following causes for trouble are not considered and
should always be checked for to exclude them as cause
for trouble:
corrosion on connector
loose contact on connector
wrong crimping on connector
corrosion on electrical wiring and fuses
corrosion on battery terminals
If individual components are checked, the control unit
electrical connections must be disconnected.
After any correction of a failure a functional test has to
be performed in the vehicle.
5.2 General Failure Symptoms
The following table (Fig. 501) lists the possible failure
symptoms.
501
Fig. 501 General Failure Symptoms
ydemeResuaC elbaborPmotpmyS eruliaF
Air heater switches No combustion after start or repeat Switch off heater momentarily and
off automat no hctiwstratsyllaci
once again
Flame extinguishes during Switch off heater momentarily and
no hctiwsnoitarepo
once again
rof gnitcud ria taeh kcehCstaehrevo retaeH
Operation indication flashes obstructions, allow heater to cool
down, switch off heater momentarily
and switch on
once again
yrettab egrahClacirtcele elciheV
system voltage too low Switch off heater momentarily and
switch on
once again
Heater expels black fumes Combustion air and/or Check combustion and exhaust
exhaust ducting blocked ducting for obstructions
5 Troubleshooting
Air Top 2000 S
