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Webasto Air Top 2000 S D Wartungshandbuch Seite 21

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Air Top 2000 ST Troubleshooting
501
5 Troubleshooting
5.1 General
This section describes how to identify and remedy faults on
the Air Top 2000 ST air heater.
If a fault occurs, an error code will be output in the display
of the combination timer. If the heater has a control
element, the ON control light will flash. In addition the
heater can be checked using a personal computer (see PC
heater diagnostic operating manual).
IMPORTANT
Troubleshooting work demands precise knowledge of the
structure and theory of operation of the various
components and must be carried out by trained personnel
only.
If in doubt, refer to section 2 or 3 for a description of how
the functions interact.
NOTE
For ADR mode only
After an ADR shut-down or an operating voltage has been
applied by switching the main vehicle switch and control
element to “ON” the control unit will be set to the “Fault
lock-out” position. Before it can be restarted the control
element must be set to “OFF” or the Immediate heat button
pressed on the combination timer.
IMPORTANT
The troubleshooting guide is restricted to the localisation of
defective components. The following potential sources of
malfunctions are not taken into account and should always
be checked so that they can then be excluded as the cause
of the particular fault:
• Corrosion on connectors
• Loose plug contacts
• Poor crimp contacts on plugs
• Corroded cables and fuses
• Corroded battery terminals
If you wish to check individual components, the electrical
plug connectors on the control unit must be disconnected.
Conduct a function test in the vehicle after rectifying each
fault.
5.2 General error symptoms
The following table (Fig. 501) lists the possible error
symptoms.
Error symptom Possible cause Remedy
Heater unit cuts out
automatically
No combustion after start and restart
ON indicator flashes
Flame extinguishes during operation
ON indicator flashes
Heater unit overheats
ON indicator flashes
Battery voltage too low
ON indicator flashes
Switch heater off and then on again
Switch heater off and then on again
Check that the hot air system is clear,
allow the heater to cool, switch heater
off briefly and then on again
Charge battery
Switch heater off and then on again
Heater unit emits black smoke Combustion air and/or exhaust system
blocked
Check that the combustion air and
exhaust systems are clear
Fig. 501 General error symptoms
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