Troubleshooting - Webasto Air Top Evo 40 Workshop Manual

Troubleshooting

5 Troubleshooting
5.1 General information
If a malfunction occurs, a flashing code is displayed on the
operating indicator or a fault code F .. on the combination
timer.
In addition, the heater can be checked using a personal com-
puter (see Webasto PC Thermo Test PC Diagnosis 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. The func-
tional relationships are described in Chapter 2 and 3.
IMPORTANT
The troubleshooting guide is restricted to the localisation of
defective components.
The following fault causes should always be checked or a
fault should be excluded for the following reasons:
Error symptom
Heater cuts out automatically
Heater emits black smoke
501
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Possible cause
No combustion after starting and restarting
Operating display flashes
Flame extinguishes during operation
Operating display flashes
Heater overheated
Operating display flashes
Vehicle voltage too low
Operating display flashes
Combustion air and/or exhaust system
blocked
Fig. 501 General error symptoms
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Air Top Evo 40 / Air Top Evo 55
• Corrosion on connector
• Loose connection on connector
• Poor crimp contacts on plugs
• Corrosion on lines and fuses
• Corrosion on 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.
A direct operation of the individual components (with volt-
age) is not permitted.
5.2 General error symptoms
The following table (Fig. 501) lists possible fault symptoms.
Remedy
Switch heater off and then on again
Switch heater off and then on again
Check the hot air guide for free passage, al-
low the heater to cool down, then briefly
switch the heater off and then on again
Charge battery
Switch heater off and then on again
Check that the combustion air and exhaust
systems are clear