Error Symptoms During Function - Webasto Air Top Evo 3900 Workshop Manual

5 Troubleshooting
5.3

Error symptoms during function

The following table (Fig. 502) lists the possible error
symptoms in the order in which they may occur during
operation.
In the event of a fault, the error is to be located using this
table and rectified. It is important that the error symptom
is correctly identified.
If the error symptom is not included in this table or if the
Error symptom
No start and no illumination of the
LED on the control element
No start but LED is lit
502
fault is not found under the specific
error symptom heading, in an emergency you can contact
our technicians on our service hotline (see
www.webasto.com).
Every fault is indicated by the flashing LED on the control
element after the slow down time has finished.If the other
components are OK, a defective control unit may be the
cause of all the faults.
Occurrence
immediate
immediate
Fig. 502 Error symptoms during function
Air Top Evo 3900/5500
NOTE
possible causes
Incorrect cabling, defective fuse
The unit immediately goes into a control pause
when switched on; the control pause speed is 0 rpm
when an external temperature sensor is used.